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Table of Contents


Table of Contents

   Summary of Contents for GMC C-Series 2001

  • Page 2: Table Of Contents

    This section tells you when to perform vehicle maintenance and what fluids and lubricants to use. Customer Assistance Information This section tells you how to contact GMC for assistance and how to get service and owner publications. It also gives you information on “Reporting Safety Defects” on page 8 Index Here’s an alphabetical listing of almost every subject in this manual.
  • Page 3 We support voluntary technician certification. GENERAL MOTORS, GM, the GM Emblem, GMC and the GMC Emblem are registered trademarks of General Motors Corporation. This manual includes the latest information at the time it was printed. We reserve the right to make changes For Canadian Owners Who Prefer a after that time without further notice.
  • Page 4: How To Use This Manual

    How to Use this Manual CAUTION: Many people read their owner’s manual from beginning to end when they first receive their new vehicle. If you do this, it will help you learn about the features These mean there is something that could hurt and controls for your vehicle.
  • Page 5: Vehicle Damage Warnings

    Vehicle Damage Warnings In the notice area, we tell you about something that can damage your vehicle. Many times, this damage would Also, in this book you will find these notices: not be covered by your warranty, and it could be costly. But the notice will tell you what to do to help avoid the damage.
  • Page 6: Vehicle Symbols

    Vehicle Symbols These are some of the symbols you may find on your vehicle. Also see “Warning Lights and Gages” in the Index. For example, These symbols These symbols These symbols These symbols Here are some these symbols are important for have to do with are on some of are used on...
  • Page 7: Model Reference

    Model Reference C7H064 This manual contains information which covers conventional cab models as shown. Most models are unfinished from the factory. C6H042 C7H042 Since C-Series models delivered from the factory are finished in a variety of ways by a number of companies, you’ll probably find other manuals in your finished vehicle.
  • Page 8: Seats And Restraint Systems

    Section 1 Seats and Restraint Systems Here you’ll find information about the seats in your vehicle and how to use your safety belts properly. You can also learn about some things you should not do with safety belts. Seats and Seat Controls Center Passenger Position Safety Belts: They’re for Everyone Children...
  • Page 9: Seats And Seat Controls

    Seats and Seat Controls Bucket and Bench Seats This section tells you about the seats in your vehicle and how to adjust them. CAUTION: You can lose control of the vehicle if you try to adjust the seat while the vehicle is moving. The sudden movement could startle and confuse you, or make you push a pedal when you don’t want to.
  • Page 10: Head Restraints

    Head Restraints Seatback Latches The front of the full width bench seat seatback folds forward to let you reach the rear of the cab. Bucket seats have outboard mounted levers to tilt the seatbacks forward or rearward. Your seatback will move back and forth freely unless you come to a sudden stop then it will lock into place.
  • Page 11 National Seats (If Equipped) CAUTION: If the seatback isn’t locked, it could move forward in a sudden stop or crash. That could cause injury to the person sitting there. Always press rearward on the seatback to be sure it is locked. If your vehicle has the low back National seat, there are six ways you can adjust the seat.
  • Page 12 Height Adjustment To adjust the height of the cushion, lift the cushion To adjust the height of a height adjustment handle up self contained seat and forward. You can (hand pumped air seat), choose between two push the seat height settings.
  • Page 13 Seatback Adjustment Chugger Snubber Lock Out Feature (If Equipped) To tilt the seatback, turn the If your vehicle has this backrest tilt knob. The knob feature, the handle is is located on the lower located on the lower cushion, on the outboard outboard side of the driver’s side of the driver’s seat and seat and the inboard side of...
  • Page 14 Safety Belts: They’re for Everyone CAUTION: This part of the manual tells you how to use safety belts properly. It also tells you some things you should not do with safety belts. It is extremely dangerous to ride in a cargo area, inside or outside of a vehicle.
  • Page 15: Why Safety Belts Work

    In most states and Canadian provinces, the law says to Why Safety Belts Work wear safety belts. Here’s why: They work. Aren’t safety belts for kids? You never know if you’ll be in a crash. If you do have a crash, you don’t know if it will be a bad one.
  • Page 16 If the vehicle hits something, it stops right then. But Then something will stop them. It could be nothing stops the people. They keep moving. the windshield.
  • Page 17 Or it could be the instrument panel. With belts, you slow down as the vehicle does. You get more time to stop. Now, what if you and your passengers were to give that big vehicle a chance to deal with the force of the impact, You stop over more distance, and your strongest bones instead of you? take the forces.
  • Page 18 Here Are Questions Many People Ask If I’m a good driver, and I never drive far from home, why should I wear safety belts? About Safety Belts and the Answers You may be an excellent driver, but if you’re in an Won’t I be trapped in the vehicle after an accident even one that isn’t your fault...
  • Page 19: How To Wear Safety Belts Properly

    How to Wear Safety Belts Properly Lap-Shoulder Belt The driver has a lap shoulder belt. Here’s how to wear Adults it properly. This part is only for people of adult size. 1. Close and lock the door. Be aware that there are special things to know about 2.
  • Page 20 3. Pick up the latch plate and pull the belt across you. Don’t let it get twisted. 4. Push the latch plate into the buckle until it clicks. For suspension type seats (B), if the belt stops before it reaches the buckle, tilt the latch plate and keep pulling until you can buckle the belt.
  • Page 21 If the shoulder belt is too tight: Suspension (B) 5. To make the lap part tight on suspension type Pull out the belt at least 5 inches (130 mm). seats (B), pull down on the buckle end of the belt as you pull up on the shoulder belt.
  • Page 22 Let it go back all the way. You can add a small amount of slack. The system works like a window shade. To add a little slack, pull down on the shoulder belt just a little no more than 1 inch (25 mm). If it’s now too loose, pull it out like you did before and start again.
  • Page 23 The lap part of the belt should be worn low and snug on the hips, just touching the thighs. In a crash, this applies force to the strong pelvic bones. And you’d be less likely to slide under the lap belt. If you slid under it, the belt would apply force at your abdomen.
  • Page 24 What’s wrong with this? CAUTION: You can be seriously hurt if your shoulder belt is too loose. In a crash, you would move forward too much, which could increase injury. The shoulder belt should fit against your body. Don’t allow more than 1 inch (25 mm) of slack. The shoulder belt is too loose.
  • Page 25 What’s wrong with this? CAUTION: You can be seriously injured if your belt is buckled in the wrong place like this. In a crash, the belt would go up over your abdomen. The belt forces would be there, not at the pelvic bones.
  • Page 26 What’s wrong with this? CAUTION: You can be seriously injured if you wear the shoulder belt under your arm. In a crash, your body would move too far forward, which would increase the chance of head and neck injury. Also, the belt would apply too much force to the ribs, which aren’t as strong as shoulder bones.
  • Page 27 What’s wrong with this? CAUTION: You can be seriously injured by a twisted belt. In a crash, you wouldn’t have the full width of the belt to spread impact forces. If a belt is twisted, make it straight so it can work properly, or ask your dealer to fix it.
  • Page 28 Bench (A) Suspension (B) To unlatch the belt, just push the button on the buckle. The belt should go back out of the way. For a suspension type seat, if the belt is pulled out all the way so that it locks, press down on the button on the retractor cover to make it retract.
  • Page 29: Safety Belt Use During Pregnancy

    Safety Belt Use During Pregnancy A pregnant woman should wear a lap shoulder belt, and the lap portion should be worn as low as possible, below Safety belts work for everyone, including pregnant the rounding, throughout the pregnancy. women. Like all occupants, they are more likely to be The best way to protect the fetus is to protect the seriously injured if they don’t wear safety belts.
  • Page 30: Center Passenger Position

    Center Passenger Position Lap Belt If your vehicle has a full bench seat or a two passenger bench seat, someone can sit in the center position. When you sit in a center seating position, you have a lap safety belt, which has no retractor. To make the belt longer, tilt the latch plate and pull it along the belt.
  • Page 31: Infants And Young Children

    Buckle, position and release it the same way as the lap part of a lap shoulder belt. If the belt isn’t long enough, see “Safety Belt Extender” at the end of this section. Make sure the release button on the buckle is positioned so you would be able to unbuckle the safety belt quickly if you ever had to.
  • Page 32 CAUTION: (Continued) For example, in a crash at only 25 mph (40 km/h), a 12 lb. (5.5 kg) baby will suddenly become a 240 lb. (110 kg) force on a person’s arms. A baby should be secured in an appropriate restraint. CAUTION: People should never hold a baby in their arms while riding in a vehicle.
  • Page 33 What are the different types of add child restraints? CAUTION: on child restraints, which are purchased by the vehicle’s owner, are available in four basic types. Newborn infants need complete support, Selection of a particular restraint should take into including support for the head and neck. This is necessary because a newborn infant’s neck is consideration not only the child’s weight, height weak and its head weighs so much compared with...
  • Page 34 Restraint Systems for Children CAUTION: The body structure of a young child is quite unlike that of an adult or older child, for whom the safety belts are designed. A young child’s hip bones are still so small that vehicle’s regular safety belt may not remain low on the hip bones, as it should.
  • Page 35 A rear facing infant seat (B) provides restraint with the A forward facing child seat (C E) provides restraint for seating surface against the back of the infant. The the child’s body with the harness and also sometimes harness system holds the infant in place and, in a crash, with surfaces such as T shaped or shelf like shields.
  • Page 36 How do child restraints work? A child restraint system is any device designed for use in a motor vehicle to restrain, seat, or position children. A built in child restraint system is a permanent part of the motor vehicle. An add child restraint system is a portable one, which is purchased by the vehicle’s owner.
  • Page 37 When choosing a child restraint, be sure the child The child restraint must be secured properly in the restraint is designed to be used in a vehicle. If it is, it center of a full bench seat or the center of a will have a label saying that it meets federal motor passenger bench seat, if it doesn’t interfere with vehicle safety standards.
  • Page 38: Top Strap

    Top Strap In Canada, the law requires that forward facing child restraints have a top strap, and that the strap be Some child restraints have a top strap, or “top tether.” It anchored. In the United States, some child restraints also can help restrain the child restraint during a collision.
  • Page 39 Securing a Child Restraint in the Center Seat Position (Full Bench Seat and Two-Passenger Bench Seat) You’ll be using the lap belt. Be sure to follow the instructions that came with the child restraint. Secure the 1. Make the belt as long as possible by tilting the latch child in the child restraint when and as the instructions plate and pulling it along the belt.
  • Page 40 4. Buckle the belt. Make sure the release button is positioned so you would be able to unbuckle the safety belt quickly if you ever had to. 5. To tighten the belt, pull its free end while you push down on the child restraint. If you’re using a forward facing child restraint, you may find it helpful to use your knee to push down on the child...
  • Page 41: Older Children

    Older Children What is the proper way to wear safety belts? If possible, an older child should wear a shoulder belt and get the additional restraint a shoulder belt can provide. The shoulder belt should not cross the face or neck. The lap belt should fit snugly below the hips, just touching the top of the thighs.
  • Page 42 CAUTION: Never do this. Here two children are wearing the same belt. The belt can’t properly spread the impact forces. In a crash, the two children can be crushed together and seriously injured. A belt must be used by only one person at a time. What if a child is wearing a lap shoulder belt, but the child is so small that the shoulder belt is...
  • Page 43 CAUTION: Never do this. Here a child is sitting in a seat that has a shoulder belt, but the shoulder part is behind the child. If the child wears the belt in this way, in a crash the child might slide under the belt. The belt’s force would then be applied right on the child’s abdomen.
  • Page 44: Safety Belt Extender

    Safety Belt Extender Replacing Restraint System Parts After a Crash If the vehicle’s safety belt will fasten around you, you should use it. If you’ve had a crash, do you need new belts? But if a safety belt isn’t long enough to fasten, your After a very minor collision, nothing may be necessary.
  • Page 45: Features And Controls

    Section 2 Features and Controls Here you can learn about the many standard and optional features on your vehicle, and information on starting, shifting and braking. Also explained are the instrument panel and the warning systems that tell you if everything is working properly and what to do if you have a problem.
  • Page 46 Windows CAUTION: Leaving children in a vehicle with the windows closed is dangerous. A child can be overcome by the extreme heat and can suffer permanent injuries or even death from heat stroke. Never leave a child alone in a vehicle, especially with the windows closed in warm or hot weather.
  • Page 47: Manual Windows

    Manual Windows Turn the hand crank on each door to raise or lower the window. Power Windows (If Equipped) If you have power windows, the controls are on each door. The driver’s door has a switch for the passenger’s window as well. Your power windows will not move unless the ignition switch is turned to ON.
  • Page 48 Keys CAUTION: Leaving children in a vehicle with the ignition key is dangerous for many reasons. A child or others could be badly injured or even killed. They could operate the power windows or other controls or even make the vehicle move. Don’t leave the keys in a vehicle with children.
  • Page 49 If you have the optional one key system, the oval key The square head key will operate all locks, including the ignition switch. is for the ignition switch only. When a new vehicle is delivered, the dealer removes the plugs from the keys and gives them to the first owner. Each plug has a code on it that tells your dealer or a qualified locksmith how to make extra keys.
  • Page 50: Door Locks

    Door Locks To lock your door from the inside, slide the manual lock down. CAUTION: Unlocked doors can be dangerous. Passengers especially children easily open the doors and fall out of a moving vehicle. When a door is locked, the handle won’t open it.
  • Page 51: Leaving Your Vehicle

    Power Door Locks (If Equipped) Theft Vehicle theft is big business, especially in some cities, Push the switch marked and even commercial vehicles are no exception. LOCK to lock both doors Although your vehicle has a number of theft deterrent at once.
  • Page 52 New Vehicle “Break In” NOTICE: (Continued) Avoid making hard stops for the first NOTICE: 200 miles (322 km) or so. During this time your new brake linings aren’t yet broken Your vehicle doesn’t need an elaborate in. Hard stops with new linings can mean “break in.”...
  • Page 53: Automatic Transmission

    Ignition Positions Engine Starter Over Crank Protection (If Equipped) Use your ignition key to start your vehicle. You can Some vehicles have an engine starter over crank turn the ignition switch to protection system. This system includes a built four different positions. temperature limiting switch to prevent internal damage to the starter.
  • Page 54: Manual Transmission

    Manual Transmission Starting Your Engine Set the parking brake, shift your gear selector to 1. Without pushing the accelerator pedal, turn your NEUTRAL and hold the clutch pedal to the floor while ignition key to START. When the engine starts, let starting the engine.
  • Page 55 Restarting the Gasoline Engine While NOTICE: Moving (Automatic Transmission) If you have to restart the engine while the vehicle is Your engine is designed to work with the moving, you’ll first have to shift the automatic electronics in your vehicle. If you add electrical transmission to NEUTRAL (N).
  • Page 56 Starting Your Diesel Engine Restarting the Diesel Engine While Moving (Automatic Transmission) If you have a Caterpillar diesel engine, also refer to your Caterpillar Diesel Engine Operation & Maintenance If you have to restart the engine while the vehicle is Manual for starting procedure.
  • Page 57 Cold Weather Starting Diesel Engine Warm-Up (Caterpillar Diesel) Several factors affect how quickly your diesel engine warms up. These can include outside temperature, Because the diesel engine uses compression ignition, it engine load, idle time and your vehicle’s option content. is harder to start in cold weather than a gasoline engine.
  • Page 58 Engine Alarm and Automatic Fast Idle System (Electronically Controlled Shutdown (Option) Caterpillar Diesel and Gasoline Engines) Your CHECK GAGES light will come on if the system If your vehicle is equipped with an electronically senses high engine temperature or low engine oil controlled diesel engine, it has both automatic and pressure.
  • Page 59 Manual Fast Idle System (Caterpillar Diesel and The manual transmission (if equipped) clutch Gasoline Engines) pedal is not pressed or, the automatic transmission (if equipped) is in NEUTRAL (N). The manual fast idle switch The manual fast idle feature is activated by pressing the is located on the lower switch on the instrument panel.
  • Page 60 Radiator Shutters -- Caterpillar If the engine coolant temperature gage needle goes into the hot area on the gage, stop the engine and (If Equipped) find the cause of the overheating. Radiator shutters aid engine warm up by blocking the If you have air brakes, the dual needle air pressure airflow through the radiator and charge the air cooler to...
  • Page 61 The voltmeter charge indicator gage tells you the Engine Coolant Heater (If Equipped) condition of your battery’s charge. The gage should be in the center area during engine operation. The If your vehicle is equipped red area on the left indicates an undercharge with this feature, the plug condition;...
  • Page 62: To Use The Engine Coolant Heater

    To Use the Engine Coolant Heater 4. Before starting the engine, be sure to unplug the cord. 1. Turn off the engine. How long should you keep the coolant heater plugged 2. Find the plug in receptacle (either behind the front in? The answer depends on the outside temperature.
  • Page 63 The switch is located on The accelerator and clutch pedals must be released in the upper right side of order for the exhaust brake to engage. Whenever the the instrument panel and exhaust brake is active, the light in the switch will be on. turns the exhaust brake Do not use the exhaust brake when running the engine at on and off.
  • Page 64 Speed Rear Axle Electric Shift Automatic Transmission Control (If Equipped) The switch for the rear axle shift control is located on If your vehicle is equipped with this feature, you’ll find the shift tower to the right a label on the headliner above the windshield or in of the shift lever.
  • Page 65 When the switch is up, the rear axle is in the high range. Manual Transmission Push it down to get the low range. The switch for the rear axle The two speed axle should be in low range when shift control is on the shift you park the vehicle.
  • Page 66 Air Shift Control Also, always start the vehicle in motion with the speed axle in the LOW position. When you upshift (Manual Transmissions Only) the rear axle from LOW to HI, move the lever to the HI position, disengage the clutch, pause, engage the clutch The lever for the rear axle and then press down on the accelerator.
  • Page 67 Air Suspension Dump Control (If Equipped) Automatic Transmission Operation If your vehicle is equipped with the Hendrickson HAS We build vehicles with four, five and six speed Series single axle air suspension, you may have this automatic transmissions. This part of the manual covers control.
  • Page 68 CAUTION: CAUTION: It is dangerous to get out of your vehicle if the Shifting out of PARK (P) or NEUTRAL (N) while shift lever is not fully in PARK (P) with the your engine is “racing” (running at high speed) is parking brake firmly set.
  • Page 69: Manual Transmission Operation

    Automatic Transmission Third Gear Hold Double-Clutching (If Equipped) You must use the “double clutching” method when you shift an unsynchronized gear set. Disengage the clutch, If your vehicle is equipped with this feature, your range shift to NEUTRAL and engage the clutch. When selector has a “2 3”...
  • Page 70 Eaton Fuller 9 and 10-Speed Clutch Brake (Vehicles with Non-Synchronized Manual Transmissions Non-Synchronized Transmission) (If Equipped) A clutch brake is used to stop transmission input shaft rotation so that FIRST (1) or REVERSE (R) gear If your vehicle has one of these unsynchronized selection can be initiated when the vehicle is at a transmissions, it’s naturally somewhat complicated.
  • Page 71 Eaton Fuller Transmission with Two-Speed Rear Axle Countershaft Brake (If Equipped) 1. With the engine running, shift the two speed rear axle into low. To be sure it’s in low, you’ll need to The countershaft brake is used when you shift from a move the vehicle in gear just a little.
  • Page 72: Propshaft Brake Burnish Procedure

    Propshaft Brake Burnish Procedure You can easily adjust the parking brake by turning the knob on the lever. Turning it clockwise makes the brake It is recommended that the propshaft mounted parking grip more tightly. It will also make the lever seem harder brake be burnished as part of the new vehicle break to pull up.
  • Page 73 If your vehicle has this NOTICE: system, you will have a knob located to the right of the steering column. Driving with the parking brake on can overheat the parts in the system. You may have to replace them, and you could also damage other parts of your vehicle.
  • Page 74 Air Brake (If Equipped) If your vehicle has air brakes, you will have this control. Pulling it out applies the parking brake. CAUTION: The PARK BRAKE light will come on when the air When the yellow SYSTEM PARK and the red parking brake is applied.
  • Page 75 Vehicles built for use as tractors or towing vehicles have 3. Get into the tractor. Push and hold down the regular one or two more air brake controls. They look like this: brake pedal. 4. Push in both the yellow SYSTEM PARK and the red TRAILER AIR SUPPLY knobs.
  • Page 76 CAUTION: CAUTION: If you apply any one of the air brake parking If your vehicle is left in gear, the engine can start controls while the vehicle is moving, your rig will if the vehicle starts to roll. This can easily happen stop suddenly.
  • Page 77: Parking Over Things That Burn

    Parking Over Things That Burn Engine Exhaust CAUTION: Engine exhaust can kill. It contains the gas carbon monoxide (CO), which you can’t see or smell. It can cause unconsciousness and death. You might have exhaust coming in if: Your exhaust system sounds strange or different.
  • Page 78 Running Your Engine While You’re CAUTION: Parked (Automatic Transmission) It’s better not to park with the engine running. But if you It can be dangerous to get out of your vehicle if ever have to, here are some things to know. the shift lever is not fully in PARK (P) with the parking brake firmly set.
  • Page 79 Tilt Wheel (If Equipped) CAUTION: A tilt steering wheel allows you to adjust the steering wheel before you drive. You can also raise it to the highest level to give your legs more room when you It can be dangerous to get out of your vehicle enter or exit the vehicle.
  • Page 80: Turn And Lane Change Signals

    Turn Signal/Multifunction Lever Turn and Lane Change Signals The turn signal has two upward (for right) and two downward (for left) positions. These positions allow you to signal a turn or a lane change. To signal a turn, move the lever all the way up or down. When the turn is finished, the lever will return automatically.
  • Page 81 Signal Stat Turn Signal and Hazard Warning To signal a turn, move the lever all the way up or down. Flasher (If Equipped) When the turn is completed, move the lever back to the center position. If you have this signal system, it is mounted beside or behind the multifunction lever on the left side of the An arrow on the instrument panel cluster will flash in steering column.
  • Page 82: Windshield Wipers

    Headlamp High/Low-Beam Changer Windshield Wipers To change the headlamps from low to high beam or high to low beam, pull the multifunction lever all the way toward you, then release it. When the high beams are on, this light on the instrument panel cluster will also be on.
  • Page 83: Windshield Washer

    Low Speed Delay Wipers (If Equipped) Windshield Washer At the top of the multifunction lever, there’s a paddle You can set the wiper speed with the word PUSH on it. To spray washer fluid on the for a long or short delay windshield, push the paddle.
  • Page 84 Cruise Control (If Equipped) If you have a manual transmission and you apply your brakes or push the clutch pedal, the cruise control will If your vehicle has this shut off. feature, it is located at the end of the turn signal/multifunction lever.
  • Page 85 Setting Cruise Control Resuming a Set Speed Once you’re going about 30 mph (48 km/h) or more, you can move the cruise control switch from ON to CAUTION: R/A (Resume/Accelerate) briefly. The vehicle will return to your chosen speed and If you leave your cruise control switch on when stay there.
  • Page 86 Increasing Speed While Using Cruise Control Reducing Speed While Using Cruise Control There are two ways to go to a higher speed: Press in the button at the end of the lever until you reach the lower speed you want, then release it. Use the accelerator pedal to get to the higher speed.
  • Page 87 Using Cruise Control on Hills Ending Cruise Control How well your cruise control will work on hills depends There are different ways to turn off the cruise control: upon your speed, load and the steepness of the hills. Step lightly on the brake pedal. When going up steep hills, you may want to step on the Push the clutch pedal, if you have a accelerator pedal to maintain your speed.
  • Page 88 Trailer Brake Hand Control This feature lets you apply the trailer brakes without applying the tractor brakes. You can apply the trailer Valve (Option) brakes a little or apply them all the way if you have to. Use this control only when you’re driving. Don’t use it If your vehicle has this feature, the control is mounted for parking or to hold the rig on a hill.
  • Page 89 Inter Axle Differential Lock Control Let up on the accelerator before you turn on your inter axle differential lock. When you turn on this (If Equipped) control, the DIFF LOCK indicator on the instrument panel cluster will light. If your vehicle has this feature, the control is located at the lower NOTICE:...
  • Page 90: Rear Axle Differential Lock Control

    Rear Axle Differential Lock Control If you’re approaching a slippery surface where it looks like one or even both wheels may start to slip, you can (If Equipped) use this control. It locks your rear differential so that power is transmitted equally to both rear wheels. If your vehicle has a controlled traction or Let up on the accelerator before you turn on your rear...
  • Page 91 Engine Air Control (If Equipped) When the handle is pulled out, the engine air intake supply is closed off from the front scoop and an under hood air supply is opened. This control is intended only for use in cold weather (32 _ F (0 _ C) or below) where snow and ice might plug the external intake.
  • Page 92: Exterior Lamps

    Exterior Lamps Press the top left switch to turn on the following: Parking Lamps Headlamps Marker Lamps (if your vehicle has the marker and The lamp switches are located on the left side of your clearance lamps switch) instrument panel cluster. Taillamps Instrument Panel Lights License Plate Lamps...
  • Page 93 Instrument Panel Intensity Control The high and low beam headlamps will come on at reduced brightness in daylight when the following Move the thumbwheel, located to the right of the off conditions are met: switch, down to dim your instrument panel lights. The ignition is on, Moving this wheel up makes these lights brighter.
  • Page 94 Marker and Clearance Lamps Switch (If Equipped) Your vehicle will have this switch only if it is designed to pull a trailer. If it has this switch, you’ll find it located on the upper right side of your instrument panel, just above the radio.
  • Page 95: Interior Lamps

    Interior Lamps Outside Mirrors Adjust the outside mirror or Dome Lamp mirrors by hand so you can The dome lamps will come on when you open the just see a little of the side of driver’s door. You can also turn the dome lamps on by your vehicle when you’re turning the instrument panel intensity control all the way sitting in the driver’s seat.
  • Page 96 Convex Outside Mirrors (Option) Heated Outside Mirrors (If Equipped) Your vehicle may have optional convex mirrors. A If your vehicle has heated convex mirror’s surface is curved so you can see more mirrors, you’ll find this from the driver’s seat. switch on the upper right side of your instrument panel area, just above the...
  • Page 97: Ashtray And Cigarette Lighter

    Ashtray and Cigarette Lighter NOTICE: (If Equipped) The ashtray is located below the gages on the right side Don’t put papers and other things that burn into of your instrument panel. If you have a cigarette lighter, your ashtray. If you do, cigarettes or other it is inside the ashtray.
  • Page 98 Auxiliary Power Jacks (If Equipped) NOTICE: If your vehicle has these power jacks, you’ll find Whether or not your vehicle has the power them in the ashtray. outlets, don’t plug in FM communications gear at the ashtray area. FM equipment creates high heat, and over time the area could get so hot that wires could be damaged or a fire could even break out.
  • Page 99 Trailer Connections (If Equipped) Electrical Connections (If Equipped) If your vehicle has this system, it has a seven wire cable These connections are located at the rear of the that will go to the trailer to supply electrical power to cab.
  • Page 100 The Instrument Panel Your Information System 2-56...
  • Page 101 The main components of your instrument panel are the following: A. Left Side Window Defogger J. Glove Box B. Main Lamps Switch K. Hourmeter (If Equipped) C. Vent L. Convenience Center Fuse Panel D. Instrument Panel Cluster M. Air Vent Controls E.
  • Page 102: Instrument Panel Cluster

    Instrument Panel Cluster Gasoline Engine Shown; Diesel Engine Similar Your instrument panel cluster is designed to let you know at a glance how your vehicle is running. You’ll know how fast you’re going, about how much fuel is left and many other things you’ll need to drive safely and economically. 2-58...
  • Page 103: Speedometer And Odometer

    Speedometer and Odometer You may wonder what happens if your vehicle needs a new odometer installed. If the new one can be set to the mileage total of the old odometer, then it must be. But if it can’t, then it’s set at zero, and a label must be put on the driver’s door to show the old mileage reading when the new odometer was installed.
  • Page 104 Tachometer (If Equipped) Warning Lights, Gages and Indicators This part describes the warning lights and gages that may be on your vehicle. The pictures will help you locate them. Warning lights and gages can signal that something is wrong before it becomes serious enough to cause an expensive repair or replacement.
  • Page 105 When one of the warning lights comes on and stays on Charging System Indicator Light when you are driving, or when one of the gages shows there may be a problem, check the section that tells you what to do about it. Please follow this manual’s advice. CAUTION: Waiting to do repairs can be costly and even...
  • Page 106 Driving while this light is on could drain your battery. If As engine speeds are increased, this condition should you must drive a short distance with the light on, turn correct itself because higher engine speeds allow the off your radio and other accessories. charging system to create maximum power.
  • Page 107: Brake System Warning Light

    Range Inhibited Warning Light (If Equipped) NOTICE: If your vehicle is equipped with an automatic If the check transmission warning light comes on transmission, this light while you are driving, it is a warning that making could turn on indicating that a transmission “range”...
  • Page 108 Hydraulic Brake System Warning Lights If the AUX BRAKE warning light comes on, it Vehicles with hydraulic systems have two brake system means that there is warning lights on the instrument panel. something wrong in the auxiliary brake system. If the PRIMARY BRAKE warning light comes on, it means that the fluid level in the master cylinder...
  • Page 109 See “Towing Your Vehicle” in the Index. See “Hydraulic However, it is designed to come on, and stay on, Brake Systems” in the Index for more information. when brake reservoir pressure has dropped below 60 to 70 psi (410 to 480 kPa). When this warning light comes on, you will also hear a CAUTION: warning tone.
  • Page 110 Apply Park Brake Warning Light (Option) Parking Brake Warning Light This light warns the driver This light turns on as a that the ignition has been check when the engine is turned off without applying first started and any time the the parking brake.
  • Page 111 Parking Brake Indicator Light CAUTION: Vehicles with hydraulic or air brakes have a brake If the SERVICE PARK BRAKE warning light indicator light. When the comes on and the warning tone sounds, your ignition is on, this light will come on when you set your vehicle can stop suddenly and without further parking brake.
  • Page 112 Anti-Lock Brake System Warning Light Trailer Anti-Lock Brake System (If Equipped) Warning Light With the anti lock brake When this light comes on system, this light will come it means there is something on when you start your wrong in the trailer engine and it may stay on anti lock brake system.
  • Page 113: Engine Coolant Temperature Gage

    Engine Coolant Temperature Gage Low Coolant Warning Light You have a LOW COOLANT warning light. If this light comes on, your system is low on coolant and the engine may overheat. The warning light should come on briefly, as a check, when you turn on the ignition.
  • Page 114: Diesel Engines

    Manual Fast Idle Indicator Light Intake Heater Indicator Light (If Equipped) (Diesel Engines) If your vehicle is equipped This light on the instrument with an electronically panel cluster will come on controlled diesel engine or when the intake heater is gasoline engine, you may on and the ignition key is have this indicator light.
  • Page 115: Malfunction Indicator Lamp

    Service Trans Filter Indicator Light Malfunction Indicator Lamp (If Equipped) (Check Engine Light) If your vehicle is equipped with either a gasoline engine If your vehicle has this or an electronically controlled diesel engine, you will light, you’ll find it located have this light.
  • Page 116: Engine Oil Pressure Gage

    This light should come on when the ignition is on, but Engine Oil Pressure Gage the engine is not running, as a check to show you it is working. If it does not come on at all, have it repaired. NOTICE: If you keep driving your vehicle with this light on, after a while, your emission controls may not...
  • Page 117 A reading in the low pressure zone may be caused by a Change Oil Light (If Equipped) dangerously low oil level or other problem. The CHANGE OIL light If you have a Caterpillar diesel engine, also see your should come on briefly Caterpillar Operation &...
  • Page 118 Reduced Engine Power Warning Light Diff Lock Indicator Light (If Equipped) If the CHECK ENGINE This light located on the and REDUCED ENGINE instrument panel cluster POWER lights are on, a is on when the inter axle noticeable reduction in differential lock system is the vehicle’s performance in use.
  • Page 119: Transmission Temperature Gage

    Transmission Temperature Gage Daytime Running Lamps (DRL) (If Equipped) Indicator Light If you have an automatic This light is located on transmission this gage is the upper portion of the located to the right of the instrument panel cluster. dash mounted shift lever. It goes on whenever the Daytime Running Lamps are on.
  • Page 120: Fuel Gage

    Check Gages Indicator Light (If Equipped) Fuel Gage This light will come on as you’re starting the engine, just as a check. If it ever comes on and stays on while you are driving, however, it means that either your engine coolant temperature gage or your engine oil pressure gage may Gasoline Engine Diesel Engine...
  • Page 121 When the ignition is on, your fuel gage lets you know Air Pressure Gage (If Equipped) about how much fuel you have left. When the gage first If your vehicle has air shows empty, you’ll still have a little fuel left, but you brakes, this gage at the should get more fuel soon.
  • Page 122 Filter Minder Gage Hourmeter Gage (If Equipped) (Diesel Engine) (Option) If your vehicle has this gage, it will be to the lower This optional gage is in left of the steering column, the lower center of the mounted on a bracket either instrument panel cluster.
  • Page 123: Comfort Controls And Audio Systems

    Section 3 Comfort Controls and Audio Systems In this section, you’ll find out how to operate the comfort control and audio systems offered with your vehicle. Be sure to read about the particular systems supplied with your vehicle. Comfort Controls AM/FM Stereo Air Conditioning Remote Cassette Tape Player (If Equipped)
  • Page 124: Comfort Controls

    Comfort Controls HEATER: Heated air comes out near the floor. This is the best setting for cold weather. Standard Comfort Controls DEFOG: This setting operates the defogger. If your vehicle does not have air conditioning, this is Heated air comes out near the windshield. Use this when what your comfort controls will look like.
  • Page 125 Optional Comfort Controls (If Equipped) If your vehicle has air conditioning, your comfort controls will look like this. Temperature Selector Bar The bar under your system display lets you select the temperature of the air coming into the passenger area of your vehicle.
  • Page 126 Left Blend Button A/C Button The airflow can be blended between the two positions. Press the A/C button to turn your air conditioner on and To blend between the positions, press the side of the off. The A/C symbol will light on your display, and air button showing the area where you would like more will come out of your instrument panel vents.
  • Page 127: Air Conditioning

    If your air conditioner develops high system pressure, it will automatically go into the MAX mode and REC will Press this button to turn the air conditioning/heating light on your display. The A/C system will remain in the system off. Pressing OFF will erase the present mode of MAX mode, even if you press the MAX button, until operation from the system’s memory.
  • Page 128: Ventilation System

    Defogging Ventilation System Use DEFOG, along with the HEATER setting, when Air comes into your vehicle in one of two ways: power there is fog or ice on the windshield. This will direct air or ram air. Power air means bringing outside air into airflow toward the windshield and front side windows.
  • Page 129: Audio Systems

    Ventilation Tips Audio Systems Keep the hood and front air inlet free of ice, snow or Your audio system has been designed to operate easily any other obstruction (such as leaves). The heater and give years of listening pleasure. You will get the and defogger will work far better, reducing the most enjoyment out of it if you acquaint yourself with it chance of fogging the inside of your windows.
  • Page 130 AM-FM Stereo CALL: Press this button to display the clock for a few seconds when the radio is on. To change what is normally shown on the display (station or time), press this button and the SET button. Finding a Station AM/FM: Press this button to switch between AM and FM.
  • Page 131 PUSHBUTTONS: The six numbered pushbuttons let Setting the Tone you return to your favorite stations. You can set up to BAS: Slide this lever left or right to decrease or increase 12 stations (six AM and six FM). Just: the bass. 1.
  • Page 132: Understanding Radio Reception

    Remote Cassette Tape Player (If Equipped) REW: Press the left arrow to rapidly reverse the tape. Press FF to stop reversing the tape. FF: Press the right arrow to rapidly advance the tape. Press REW to stop forwarding the tape. PROGRAM: A lighted arrow will show which side of the tape is playing.
  • Page 133 Tips About Your Audio System NOTICE: Hearing damage from loud noise is almost undetectable until it is too late. Your hearing can adapt to higher Before you add any sound equipment to your volumes of sound. Sound that seems normal can be loud vehicle like a tape player, CB radio, mobile and harmful to your hearing.
  • Page 134: Care Of Your Cassette Tape Player

    Care of Your Cassette Tape Player You may also choose a non scrubbing action, wet type cleaner which uses a cassette with a fabric belt to clean A tape player that is not cleaned regularly can cause the tape head. This type of cleaning cassette will not reduced sound quality, ruined cassettes or a damaged eject on its own.
  • Page 135: Your Driving And The Road

    Section 4 Your Driving and the Road Here you’ll find information about driving on different kinds of roads and in varying weather conditions. We’ve also included many other useful tips on driving. Defensive Driving Driving in Rain and on Wet Roads Drunken Driving City Driving Control of a Vehicle...
  • Page 136: Defensive Driving

    Defensive driving really means “be ready for anything.” On city streets, rural roads or freeways, it means “always expect the unexpected.” Assume that pedestrians or other drivers are going to be careless and make mistakes. Anticipate what they might do. Be ready for their mistakes. Rear end collisions are about the most preventable of accidents.
  • Page 137: Drunken Driving

    Drunken Driving The obvious way to solve the leading highway safety problem is for people never to drink alcohol and then Death and injury associated with drinking and driving is drive. But what if people do? How much is “too much” a national tragedy.
  • Page 138 Since alcohol is carried in body water, this means that a woman generally will reach a higher BAC level than a man of her same body weight when each has the same number of drinks. The law in many U.S. states sets the legal limit at a BAC of 0.10 percent.
  • Page 139 The body takes about an hour to rid itself of the alcohol in one drink. No amount of coffee or number of cold CAUTION: showers will speed that up. “I’ll be careful” isn’t the right answer. What if there’s an emergency, a need to Drinking and then driving is very dangerous.
  • Page 140: Control Of A Vehicle

    Control of a Vehicle Braking You have three systems that make your vehicle go where Braking action involves perception time and you want it to go. They are the brakes, the steering and reaction time. the accelerator. All three systems have to do their work First, you have to decide to push on the brake pedal.
  • Page 141: Hydraulic Brake Systems

    Avoid needless heavy braking. Some people drive in Hydraulic Brake Systems spurts heavy acceleration followed by heavy If your engine stops running, or if your primary brake braking rather than keeping pace with traffic. This is a system stops working, your vehicle has a reserve power mistake.
  • Page 142: Anti-lock Brakes (abs)

    Anti-Lock Brakes (ABS) Your vehicle has anti lock brakes (ABS). ABS is an advanced electronic braking system that will help prevent a braking skid. When you start your engine and begin to drive away, your anti lock brake system will check itself. You may hear a momentary motor or clicking noise while this test is going on.
  • Page 143 A computer senses that wheels are slowing down. If one As you brake, your computer keeps receiving updates on of the wheels is about to stop rolling, the computer will wheel speed and controls braking pressure accordingly. separately work the brakes at each wheel. Remember: Anti lock doesn’t change the time you need The anti...
  • Page 144: Braking In Emergencies

    Braking in Emergencies Steering At some time, nearly every driver gets into a situation Power Steering that requires hard braking. If you lose power steering assist because the engine If you have anti lock, you can steer and brake at the stops or the system is not functioning, you can steer but same time.
  • Page 145: Steering In Emergencies

    The traction you can get in a curve depends on the Steering in Emergencies condition of your tires and the road surface, the angle There are times when steering can be more effective at which the curve is banked, and your speed. While than braking.
  • Page 146: Off Road Recovery

    Road Recovery You may find that your right wheels have dropped off the edge of a road onto the shoulder while you’re driving. An emergency like this requires close attention and a quick decision. If you are holding the steering wheel at the recommended 9 and 3 o’clock positions, you may be able to turn it just enough to miss the object without removing either hand.
  • Page 147 Passing Watch for traffic signs, pavement markings and lines. If you can see a sign up ahead that might indicate a The driver of a vehicle about to pass another on a turn or an intersection, delay your pass. A broken lane highway waits for just the right moment, center line usually indicates it’s all right to pass accelerates, moves around the vehicle ahead, then goes...
  • Page 148: Loss Of Control

    If other cars are lined up to pass a slow vehicle, wait Loss of Control your turn. But take care that someone isn’t trying to Let’s review what driving experts say about what pass you as you pull out to pass the slow vehicle. happens when the three control systems (brakes, steering Check your mirrors and start your left lane change and acceleration) don’t have enough friction where the...
  • Page 149: Driving At Night

    A cornering skid and an acceleration skid are Driving at Night usually best handled by easing your foot off the accelerator pedal. Of course, traction is reduced when water, snow, ice, gravel or other material is on the road. For safety, you’ll want to slow down and adjust your driving to these conditions.
  • Page 150 Here are some tips on night driving. You can be temporarily blinded by approaching headlamps. It can take a second or two, or even several Drive defensively. seconds, for your eyes to readjust to the dark. When you Don’t drink and drive. are faced with severe glare (as from a driver who doesn’t lower the high beams, or a vehicle with Since you can’t see as well, you may need to...
  • Page 151 Driving in Rain and on Wet Roads Rain and wet roads can mean driving trouble. On a wet road, you can’t stop, accelerate or turn as well because your tire road traction isn’t as good as on dry roads. And, if your tires don’t have much tread left, you’ll get even less traction.
  • Page 152 CAUTION: Wet brakes can cause accidents. They won’t work as well in a quick stop and may cause pulling to one side. You could lose control of the vehicle. After driving through a large puddle of water or a vehicle wash, apply your brake pedal lightly until your brakes work normally.
  • Page 153: Driving Through Deep Standing Water

    Hydroplaning Driving Through Deep Standing Water Hydroplaning is dangerous. So much water can build up under your tires that they can actually ride on the water. NOTICE: This can happen if the road is wet enough and you’re going fast enough. When your vehicle is hydroplaning, If you drive too quickly through deep puddles or it has little or no contact with the road.
  • Page 154: Driving Through Flowing Water

    Driving Through Flowing Water Some Other Rainy Weather Tips Turn on your low beam headlamps and your marker and clearance lamps, if your vehicle has them CAUTION: just your parking lamps to help make you more visible to others. Flowing or rushing water creates strong forces. Besides slowing down, allow some extra following If you try to drive through flowing water, as you distance.
  • Page 155: City Driving

    City Driving Here are ways to increase your safety in city driving: Know the best way to get to where you are going. Get a city map and plan your trip into an unknown part of the city just as you would for a cross country trip.
  • Page 156: Freeway Driving

    Freeway Driving At the entrance, there is usually a ramp that leads to the freeway. If you have a clear view of the freeway as you drive along the entrance ramp, you should begin to check traffic. Try to determine where you expect to blend with the flow.
  • Page 157: Highway Hypnosis

    The exit speed for cars but not larger vehicles What can you do about highway hypnosis? First, be usually posted. You should go more slowly. aware that it can happen. Reduce your speed according to your speedometer, not Then here are some tips: to your sense of motion.
  • Page 158: Hill And Mountain Roads

    Hill and Mountain Roads Here are some tips that can make your drive through steep country safer: Keep the vehicle in good shape. Check all fluid levels and also the brakes, tires, cooling system and transmission. These parts can work hard on mountain roads.
  • Page 159 Know how to go uphill. Use lower gears. They help cool your engine and transmission, and you can CAUTION: climb the hill better. Stay in your own lane when driving on two lane Coasting downhill in NEUTRAL (N) or with the roads in hills or mountains.
  • Page 160 Winter Driving Here are some tips for winter driving: Be sure the vehicle is in good shape for winter. You may want to put winter emergency supplies in your vehicle. Include an ice scraper, a small brush or broom, a supply of windshield washer fluid, a rag, some winter outer clothing, a small shovel, a flashlight, a red cloth and reflective warning triangles.
  • Page 161: Driving On Snow Or Ice

    Driving on Snow or Ice What’s the worst time for this? “Wet ice.” Very cold snow or ice can be slick and hard to drive on. But wet Most of the time, those places where your tires meet the ice can be even more trouble because it may offer the road probably have good traction.
  • Page 162 If You’re Caught in a Blizzard Tie a red cloth to your mirror arm to alert police that you’ve been stopped by the snow. Put on extra clothing or wrap a blanket around you. If you have no blankets or extra clothing, make body insulators from newspapers, burlap bags, rags, floor mats anything you can wrap around yourself or...
  • Page 163 Run your engine only as long as you must. This saves fuel. When you run the engine, make it go a little faster CAUTION: than just idle. That is, push the accelerator slightly. This uses less fuel for the heat that you get and it keeps the Snow can trap exhaust gases under your vehicle.
  • Page 164: Loading Your Vehicle

    Loading Your Vehicle This is called the Gross Vehicle Weight Rating (GVWR). The GVWR includes the weight of the vehicle, all The GVW/Tire Information label is found on the rear occupants, fuel and cargo. edge of the driver’s door. The label shows the size of The Certification/Tire label is provided by the final your original tires and the inflation pressures needed to manufacturer and should be on the door or door jamb.
  • Page 165 CAUTION: CAUTION: Do not load your vehicle any heavier than the Things you put inside your vehicle can strike GVWR, or either the maximum front or rear and injure people in a sudden stop or turn, or GAWR. If you do, parts on your vehicle can in a crash.
  • Page 166 Power Take Off (PTO) (If Equipped) To engage a PTO while in stationary variable mode: 1. Make sure the vehicle is stopped. Before using a PTO, refer to the manufacturer’s or installer’s instructions. 2. Shift the transmission into NEUTRAL (N) or PARK (P), if equipped.
  • Page 167 To engage a PTO while in mobile variable mode: 4. Engine speed is controlled by the turn signal/multifunctional lever. 1. Select the desired drive gear. Do not hold the brake or clutch pedal down. A. The SET position holds the engine speed selected by the accelerator pedal.
  • Page 168: Problems On The Road

    Section 5 Problems on the Road Here you’ll find what to do about some problems that can occur on the road. Hazard Warning Flashers Cooling System (Diesel Engine) Other Warning Devices Engine Fan Noise Jump Starting If a Tire Goes Flat Towing Your Vehicle Changing a Flat Tire Engine Overheating...
  • Page 169: Hazard Warning Flashers

    Hazard Warning Flashers Press the button in to make your front and rear turn signal lamps flash on and off. Your hazard warning flashers work no matter what position your key is in, and even if the key isn’t in. Your hazard warning flashers let you warn others.
  • Page 170: Hazard Warning Flasher Switch

    Hazard Warning Flasher Switch With some options, such as U86 trailer wiring or tractor application, you will have this switch. This (If Equipped) switch replaces the hazard switch mounted on the steering column. It is mounted in the instrument panel, usually to the left of and below the steering column.
  • Page 171: Other Warning Devices

    Signal-Stat Turn Signal and Hazard To turn off the flasher, move the turn signal lever either Warning Flasher (If Equipped) up or down. Then move the If you have this system, it lets you warn others. It also signal lever back to the lets police know you have a problem.
  • Page 172: Jump Starting

    Jump Starting NOTICE: If your battery (or batteries) has run down, you may want to use another vehicle and some jumper cables to Ignoring these steps could result in costly damage start your vehicle. But please follow the steps below to to your vehicle that wouldn’t be covered by do it safely.
  • Page 173 1. Check the other vehicle. It must have a 12 volt 3. Turn off the ignition on both vehicles. Turn off all battery with a negative ground system. lamps that aren’t needed, as well as radios. This will avoid sparks and help save both batteries, and it could save your radio.
  • Page 174 5. Check that the jumper cables don’t have loose or 6. Connect the red missing insulation. If they do, you could get a shock. positive (+) cable to the The vehicles could be damaged, too. positive (+) terminal of the vehicle with the Before you connect the cables, here are some basic dead battery.
  • Page 175 8. Now connect the black 9. Attach the cable at least negative ( ) cable to 18 inches (45 cm) away the good battery’s from the dead battery, negative ( ) terminal. but not near engine parts that move. The electrical connection is just as good there, but the chance of sparks getting...
  • Page 176 To disconnect the jumper cables from both vehicles, do the following: 1. Disconnect the black negative ( ) cable from the heavy, unpainted metal engine part on the vehicle that had the dead battery. 2. Disconnect the black negative ( ) cable from the negative ( ) terminal on the vehicle with the...
  • Page 177: Towing Your Vehicle

    Towing Your Vehicle CAUTION: (Continued) Always secure the vehicle on each side with CAUTION: separate safety chains when towing it. Working on air brakes without first using To help avoid serious personal injury to you the release studs to compress the springs or others: can lead to injury.
  • Page 178 Before you do anything, turn on the hazard warning Towing Your Vehicle From the Front flashers (if they have not been damaged). (Front Wheels Off the Ground) When you call, tell the towing service: Before Towing That your vehicle has rear wheel drive.
  • Page 179 Towing the Vehicle with the Front Bumper Removed 4. Connect lift chains to the tow bar and raise the tow bar until lift chain slack has been taken up and the 1. Remove the front bumper. hardwood beam is fully seated against the spring 2.
  • Page 180 Towing the Vehicle with the Front Bumper Installed 1. Connect and lock the lift chains to the front axle, outside of the spring anchor plates as previously shown. 2. Place a 6 x 6 x 5 hardwood beam underneath and slightly behind the front spring shackle brackets as previously shown.
  • Page 181 4. Remove the remaining slack in the lift chains. Single Drive Rear Axle The tow bar swing arm should rest against Disconnect the propshaft at the rear axle. Secure the the 2 x 12 x 40 hardwood board as shown. propshaft to the frame or crossmember.
  • Page 182 Towing Your Vehicle From the Front If there is damage or suspected damage to the axle(s), remove the axle shafts. Cover the hub openings to (All Wheels On the Ground) prevent the loss of lubricant or entry of dirt or Your vehicle may be towed on all wheels provided the foreign objects.
  • Page 183 Releasing Air-Operated Parking Brakes (If Equipped) If your vehicle has air brakes, you could have a special towing problem. If your vehicle has to be towed because of a complete loss of air pressure from both systems, the parking brakes will have automatically engaged. The tow operator can release the brakes manually by using the following steps.
  • Page 184 3. Remove the rubber 6. Using a wrench, turn the cap from the rear of stud nut clockwise the chamber. several turns to release the brakes. Follow the same procedure to release the other brake. 4. Put the release stud, nut and flat washer into 7.
  • Page 185: Engine Overheating

    Engine Overheating CAUTION: You will find a coolant temperature warning gage on your vehicle’s instrument panel, as well as a LOW COOLANT warning light. Your vehicle also has a Steam from an overheated engine can burn you CHECK GAGES warning light on the instrument panel. badly, even if you just open the hood.
  • Page 186: If No Steam Is Coming From Your Engine

    If No Steam Is Coming From Your Engine If you no longer have the overheat warning, you can drive. Just to be safe, drive slower for about 10 minutes. If you get an engine overheat warning but see or hear no If the warning doesn’t come back on, you can steam, the problem may not be too serious.
  • Page 187 Cooling System (Gasoline Engines) When you decide it’s safe to lift the hood, here’s what you’ll see: Sloped Hood A. Coolant Recovery Tank B. Engine Fan C. Radiator Pressure Cap If the coolant inside the coolant recovery tank is boiling, don’t do anything else until it cools down.
  • Page 188 CAUTION: Heater and radiator hoses, and other engine parts, can be very hot. Don’t touch them. If you do, you can be burned. Don’t run the engine if there is a leak. If you run the engine, it could lose all coolant. That could cause an engine fire, and you could be burned.
  • Page 189: Recovery Tank

    How to Add Coolant to the Coolant NOTICE: Recovery Tank If you haven’t found a problem yet, but the coolant level When adding coolant, it is important that you use isn’t at or above the HOT LEVEL mark on the vehicle only DEX COOL (silicate...
  • Page 190 CAUTION: Adding only plain water to your cooling system can be dangerous. Plain water, or some other liquid like alcohol, can boil before the proper coolant mixture will. Your vehicle’s coolant warning system is set for the proper coolant mixture. With plain water or the wrong mixture, your engine could get too hot but you wouldn’t get the overheat warning.
  • Page 191 When the coolant in the coolant recovery tank is at the HOT LEVEL mark on the vehicle with the specialty hood, or approximately half full on the vehicle with the sloped hood, start your vehicle. If the overheat warning continues, there’s one more thing you can try.
  • Page 192: How To Add Coolant To The Radiator

    How to Add Coolant to the Radiator 2. Then keep turning the pressure cap, but 1. You can remove the now push down as you radiator pressure cap turn it. Remove the when the cooling pressure cap. system, including the radiator pressure cap and upper radiator hose, is no longer hot.
  • Page 193 4. Then fill the coolant recovery tank to the HOT 7. By this time, the coolant level inside the radiator LEVEL mark on the vehicle with the specialty hood, filler neck may be lower. If the level is lower, add or approximately one half full on the vehicle with more of the proper DEX...
  • Page 194 Cooling System (Diesel Engine) The coolant level should be at COLD ADD or When you decide it’s safe to lift the hood, here’s what higher. If it isn’t, you may you’ll see: have a leak in the radiator hoses, heater hoses, radiator, water pump or somewhere else in the cooling system.
  • Page 195 NOTICE: CAUTION: Engine damage from running your engine Steam and scalding liquids from a hot cooling without coolant isn’t covered by your warranty. system can blow out and burn you badly. They are under pressure, and if you turn the coolant If there seems to be no leak, start the engine again.
  • Page 196 CAUTION: Adding only plain water to your cooling system can be dangerous. Plain water, or some other liquid like alcohol, can boil before the proper coolant mixture will. Your vehicle’s coolant warning system is set for the proper coolant mixture. With plain water or the wrong mixture, your engine could get too hot but you wouldn’t get the overheat warning.
  • Page 197 CAUTION: You can be burned if you spill coolant on hot engine parts. Coolant contains ethylene glycol and it will burn if the engine parts are hot enough. Don’t spill coolant on a hot engine. 1. You can remove the coolant surge tank pressure cap when the cooling system, including the coolant surge tank pressure cap and upper radiator hose, is no longer hot.
  • Page 198 2. Then keep turning the cap, but now push down as 3. Then fill the coolant surge tank with the proper you turn it. Remove the pressure cap. coolant mixture, up to the COLD FULL mark. 5-31...
  • Page 199 4. With the coolant surge tank pressure cap off, start the engine and let it run until you can feel the upper radiator hose getting hot. Watch out for the engine fan. By this time, the coolant level inside the coolant surge tank may be lower.
  • Page 200: Engine Fan Noise

    Engine Fan Noise If a Tire Goes Flat Your vehicle has a clutched engine cooling fan. When It’s unusual for a tire to “blow out” while you’re driving, the clutch is engaged, the fan spins faster to provide especially if you maintain your tires properly. If air goes more air to cool the engine.
  • Page 201 Changing a Flat Tire So if you’re stopped somewhere by a flat or damaged tire or wheel, you should get expert help. See “Roadside Your truck, when new, included no tire changing Assistance” in the Index. equipment and no place to store a tire in the vehicle. Few drivers of these vehicles have the necessary equipment aboard to be able to change a flat tire safely.
  • Page 202: Rocking Your Vehicle To Get It Out

    If You’re Stuck: In Sand, Mud, NOTICE: Ice or Snow In order to free your vehicle when it is stuck, you will Spinning your wheels can destroy parts of your need to spin the wheels, but you don’t want to spin vehicle as well as the tires.
  • Page 203: Service And Appearance Care

    Section 6 Service and Appearance Care Here you will find information about the care of your vehicle. This section begins with service and fuel information, and then it shows how to check important fluid and lubricant levels. There is also technical information about your vehicle, and a part devoted to its appearance care.
  • Page 204: Doing Your Own Service Work

    Service Doing Your Own Service Work If you want to do some of your own service work, you’ll Your dealer knows your vehicle best and wants you to want to use the proper service manual. It tells you much be happy with it. We hope you’ll go to your dealer for more about how to service your vehicle than this manual all your service needs.
  • Page 205 CAUTION: (Continued) CAUTION: (Continued) Be sure to use the proper nuts, bolts and to anyone such as a service technician who is other fasteners. “English” and “metric” nearby. And, of course, the pieces can severely fasteners can be easily confused. If you use damage the vehicle.
  • Page 206 Fuel (Gasoline Engine) In Canada, look for the “Auto Makers’ Choice” If your vehicle has a diesel engine, see “Diesel Engine label on the fuel pump. Fuel” in this section. For vehicles with gasoline engines, please read this. Use regular unleaded gasoline rated at 87 octane or higher.
  • Page 207 Some gasolines that are not reformulated for low NOTICE: emissions may contain an octane enhancing additive called methylcyclopentadienyl manganese tricarbonyl (MMT); ask your service station operator whether or not Your vehicle was not designed for fuel that the fuel contains MMT. General Motors does not contains methanol.
  • Page 208 Water in Fuel NOTICE: Sometimes, water can be pumped into your fuel tank along with your diesel fuel. This can happen if a service If there is water in your diesel fuel and the station doesn’t regularly inspect and clean its fuel tanks, weather is warm or humid, fungus and bacteria or if it gets contaminated fuel from its suppliers.
  • Page 209: Gasoline Engines

    Fuels in Foreign Countries Filling Your Tank (Gasoline Engines) If you plan on driving in another country outside the United States or Canada, the proper fuel may be hard to find. Never use leaded gasoline or any other fuel not recommended in the previous text on fuel.
  • Page 210 The fuel cap can be on either or both sides of your When you put the cap back on, turn it to the vehicle depending on option content. right (clockwise) until it is tight. To take off the cap, turn it slowly to the left (counterclockwise).
  • Page 211: Filling A Portable Fuel Container

    Filling a Portable Fuel Container Checking Things Under the Hood CAUTION: Never fill a portable fuel container while it is in your vehicle. Static electricity discharge from the container can ignite the gasoline vapor. You can be badly burned and your vehicle damaged if this occurs.
  • Page 212 Then take the hand holds and pull the hood forward. When you tilt the hood far enough, the cables will support it. 6-10...
  • Page 213 Then place the prop rod, located on the panel, where the arrow is pointing. CAUTION: If your vehicle has the optional hood access panels, you can easily get to one side of the engine or the other as you need to. Things that burn can get on hot engine parts and start a fire.
  • Page 214: Maintenance Schedule

    Noise Control System 2. The use of the vehicle after such device or element of design has been removed or rendered inoperative The following information relates to compliance with by any person. federal noise emission standards for vehicles with a Among those acts presumed to constitute tampering are Gross Vehicle Weight Rating (GVWR) of more than the acts listed below.
  • Page 215: Checking Engine Oil

    Engine Oil (Gasoline Engine) Turn off the engine and give the oil several minutes to drain back into the oil pan. If you don’t, the oil dipstick If the CHANGE OIL light appears on the instrument might not show the actual level. panel, it means you need to check your engine oil level Pull out the dipstick and clean it with a paper towel or right away.
  • Page 216: When To Add Engine Oil

    When to Add Engine Oil What Kind of Engine Oil to Use If the oil is at or below the cross hatched area, then Oils recommended for your vehicle can be identified by you’ll need to add at least one quart of oil. But you must looking for the starburst symbol.
  • Page 217 As in the chart shown previously, SAE 5W 30 is best for your vehicle. However, you can use SAE 10W 30 if it’s going to be 0 C) or above. These numbers on an oil container show its viscosity, or thickness. Do not use other viscosity oils, such as SAE 20W NOTICE: Use only engine oil with the American Petroleum...
  • Page 218: Engine Oil Additives

    Engine Oil Additives How to Reset the Change Oil Light To reset the CHANGE OIL light, do the following: Don’t add anything to your oil. The recommended oils with the starburst symbol are all you will need for good 1. Turn the ignition key to ON with the engine off. performance and engine protection.
  • Page 219: Gasoline Engine

    Used oil can be a real threat to the environment. If you Air Filter Restriction Indicator change your own oil, be sure to drain all free flowing oil (Gasoline Engine) from the filter before disposal. Don’t ever dispose of oil by putting it in the trash, pouring it on the ground, into Your engine has an indicator that lets you know when sewers, or into streams or bodies of water.
  • Page 220: Engine Air Cleaner/filter

    Engine Air Filter Restriction Engine Air Cleaner/Filter Indicator (Diesel Engines) Your GM Maintenance Schedule says when to replace the air filter. Your engine has an indicator that lets you know when the air filter is dirty and needs to be serviced. It is located in the air intake tube below the air cleaner on the passenger’s side of the engine.
  • Page 221 Automatic Transmission Fluid CAUTION: When to Check A good time to have it checked is when the engine oil is Gasoline Engines Only: Operating the engine checked. See your Allison Automatic Transmission with the air cleaner/filter off can cause you or Operator’s Manual to find out when to change your others to be burned.
  • Page 222 Automatic Transmission External Filter Manual Transmission Fluid Your automatic transmission spin on type filter requires When to Check periodic replacement. It is mounted just behind the A good time to have it checked is when the engine oil is radiator on the outside of the passenger’s side frame rail. checked.
  • Page 223: Rear Axle

    Rear Axle What to Use Refer to the Maintenance Schedule to determine what When to Check and Change Lubricant kind of lubricant to use. See “Recommended Fluids and Refer to the Maintenance Schedule to determine how Lubricants” in the Maintenance Schedule. often to check the lubricant and when to change it.
  • Page 224 Engine Coolant (Gasoline Engine) NOTICE: The cooling system in your vehicle is filled with COOL engine coolant. This coolant is designed When adding coolant, it is important that you use to remain in your vehicle for 5 years or 150,000 miles COOL R (silicate only DEX free) coolant.
  • Page 225 What to Use NOTICE: Use a mixture of one half clean, drinkable water and half DEX COOL coolant which won’t damage If you use an improper coolant mixture, your aluminum parts. If you use this coolant mixture, you engine could overheat and be badly damaged. don’t need to add anything else.
  • Page 226 Checking Coolant Coolant Recovery Tank (Gasoline Engines Sloped Hood) Coolant Recovery Tank (Gasoline Engines Specialty Hood) 6-24...
  • Page 227 When your engine is cold, the coolant level should be at the COLD level, or a little higher, on the coolant recovery tank with the gasoline engine, or at the COLD FULL mark, visible through the surge tank, with the diesel engine.
  • Page 228 Adding Coolant CAUTION: If you need more coolant, add the proper DEX COOL coolant mixture at the coolant recovery tank or the surge tank. You can be burned if you spill coolant on hot engine parts. Coolant contains ethylene glycol, and it will burn if the engine parts are hot CAUTION: enough.
  • Page 229: Radiator Pressure Cap

    Radiator Pressure Cap Surge Tank Pressure Cap (Gasoline Engines) (Diesel Engines) The radiator pressure cap The surge tank pressure cap must be tightly installed must be tightly installed with the arrows on the cap with the arrows on the cap lined up with the top of the lined up with the top tube of overflow tube.
  • Page 230: Power Steering Fluid

    Power Steering Fluid What to Use To determine what kind of fluid to use, see See your Maintenance Schedule for when to check your “Recommended Fluids and Lubricants” in the Index. power steering fluid. How To Check Power Steering Fluid NOTICE: Check your power steering fluid only when the engine is warm.
  • Page 231: Adding Washer Fluid

    Windshield Washer Fluid NOTICE: What to Use When using concentrated washer fluid, When you need windshield washer fluid, be sure to read follow the manufacturer’s instructions for the manufacturer’s instructions before use. If you will be operating your vehicle in an area where the temperature adding water.
  • Page 232: Brake Fluid

    Brakes Checking Brake Fluid Apply the brake pedal several times with the ignition Brake Fluid off. Then clean one of the reservoir caps and the area around the cap, and remove it. The fluid level should be If your vehicle has even with the bottom ring of the filler opening.
  • Page 233 What to Add NOTICE: Use the proper fluid listed in your Maintenance Schedule. Use new brake fluid from a sealed Using the wrong fluid can badly damage container only. brake system parts. For example, just a few Always clean the brake fluid reservoir cap and the area drops of mineral based oil, such as engine around the cap before removing it.
  • Page 234: Brake Adjustment

    Four-Wheel Disc Brakes (Hydraulic Only) Brake Adjustment Your vehicle has four wheel disc brakes. Every time you make a brake stop, your brakes adjust for wear. Some driving conditions or climates may cause a brake squeal when the brakes are first applied or lightly Replacing Brake System Parts applied.
  • Page 235 Air Brake Systems (If Equipped) Moisture Ejector (Option) If you have air brakes, it is important to get rid of If you have air brakes with a moisture ejector, the valve moisture in the system. Moisture will damage your automatically ejects moisture from the reserve tank system if it isn’t removed daily.
  • Page 236 Electric/Hydraulic Parking How to Check and Add Fluid Brake Fluid First, apply the parking brake. To check the fluid level, look at the MAX and MIN lines on the side of the If you have an electric/hydraulic parking brake, a good reservoir.
  • Page 237 Clutch Pedal Free Travel Chassis Lubrication If you have a manual transmission, your clutch will need Your Maintenance Schedule provides all of the required adjustment when pedal free travel gets down to about chassis lubrication intervals and identifies proper 1 1/4 inch (32 mm), as measured at the clutch pedal pad. lubricants to use.
  • Page 238 Single Axle Models 6-36...
  • Page 239 ITEM NO. ITEM REMARKS Brake Camshaft One fitting each (apply sparingly). For caliper rails, Brake Caliper Rails (If Equipped)$ apply Aero Shell #5 Lubricant. Steering Column Slip Joint* One fitting. Steering Drag Link Ends One fitting at each end. One fitting each joint. Steering Column U Joints Pivot Points and Hinges...
  • Page 240 ITEM NO. ITEM REMARKS Parking Brake Bell Crank*$ One fitting. Transmission Fill to level of filler plug. Check fluid level. Transmission Auto* Propshaft Slip Joint One fitting each joint; lubricate with GM Part No. 1051344 Wheel Bearing Lubricant. One fitting each joint (1480 and 1550 Series); lubricate Propshaft U Joints with GM Part No.
  • Page 241 Tandem Axle Models ITEM ITEM REMARKS Brake Camshafts One fitting each. Joint One fitting each joint Propshaft U (1480 and 1550 Series). Lubricate with GM Part No. 1051344, Wheel Bearing Lubricant. Brake Shoe Apply engine oil at pin Roller Pins to shoe joint only.
  • Page 242: Vehicle Storage

    Battery CAUTION: Your new vehicle comes with one or more maintenance free ACDelco batteries. When it’s time for a new battery, be sure it has the replacement number shown Batteries have acid that can burn you and gas on the original battery’s label. We recommend an that can explode.
  • Page 243: Windshield Wiper Blade Replacement

    Windshield Wiper Blade Replacement Replacement blades come in different types and are removed in different ways. Windshield wiper blades should be inspected at least Here’s how to remove the Sheppard’s Hook type: twice a year for wear or cracking. See “Wiper Blade 1.
  • Page 244: Other Service Items

    Other Service Items You can then remove the front cover if you need to, by removing the two 8 mm bolts and pulling it off. Component Box When you’re through, be sure to put the front cover on, Your vehicle has a component box located along the left before you put on the top cover.
  • Page 245 Fuel Filter (Diesel Engines) Secondary Fuel Filter and Water Separator/Heater (Option) The ACDelco fuel filter is located in the component box. See your Maintenance Schedule for recommended If you have a Caterpillar service intervals. diesel engine, you may have this spin on filter and fuel Primary Fuel Filter and Water separator/heater.
  • Page 246 Automatic Ether Injection System (Option) 3. Clean any dirt from the neck of the cylinder and the top of the valve before you take out the cylinder. If your diesel engine vehicle 4. Check the inside of the valve for any foreign matter. has this feature, the ether Clean the valve as necessary.
  • Page 247: Air Conditioning System

    Front Wheel Bearings with Oil-Filled Hubs Refer to your Maintenance Schedule for the proper oil to use. If your vehicle has oil filled When you fill the hub, check the glass again after hubs, occasionally check to driving a short distance. It takes a while for the oil to see if they have enough oil.
  • Page 248 Tires CAUTION: (Continued) Your new vehicle comes with high quality tires made by a leading tire manufacturer. If you ever have questions Underinflated tires pose the same danger as about your tire warranty and where to obtain service, see overloaded tires. The resulting accident your GM Warranty booklet for details.
  • Page 249 Inflation -- Tire Pressure NOTICE: (Continued) The Certification/Tire label, which is on the driver’s door, shows the correct inflation pressures for your tires If your tires have too much air (overinflation), when they’re cold. “Cold” means your vehicle has you can get the following: been sitting for at least three hours or driven no more Unusual wear than 1 mile (1.6 km).
  • Page 250: Dual Tire Operation

    Rims and Wheels The outer tire on a dual wheel setup generally wears faster than the inner tire. Your tires will wear more Rims and wheels are stamped with a maximum load evenly and last longer if you rotate the tires periodically. and cold inflation rating.
  • Page 251: Wheel Alignment And Tire Balance

    When It’s Time for New Tires When you replace tires, make sure they are the same size, load range, speed rating and construction type Replace your tires when the tread depth is down to 1/8 (bias, bias belted or radial) as your original tires. of an inch (3.2 mm) for the front tires, or 1/16 of an inch (1.6 mm) for a rear tire.
  • Page 252: Tightening The Wheel Nuts

    Tightening the Wheel Nuts CAUTION: Wheel nuts that are not tight can work loose. If all the nuts on a wheel come off, the wheel can come off the vehicle, causing a serious crash. All wheel nuts must be properly tightened. Follow the rules in this section to be sure they are.
  • Page 253 Piloted Wheels, 8 Hole or 10 Hole The studs and nuts used with these wheels have right hand threads. 1. With intermittent pilot pads, position a pad at 12 o’clock to center the wheel and reduce run out. 2. Put the tire and rim assembly on the axle hub. Install the outer rear tire and rim assembly so that its valve stem is exactly opposite the valve stem on the inner tire and rim assembly.
  • Page 254 CAUTION: CAUTION: If wheel studs are damaged, they can break. If all Rust or dirt on a wheel, or on the parts to which the studs on a wheel broke, the wheel could come it is fastened, can make the wheel nuts become off and cause a serious crash.
  • Page 255: Wheel Replacement

    How Often to Check CAUTION: Wheel tightness is so important you should have a technician check nut tightness on all wheels with a torque wrench every 1,000 miles (1 600 km). Without the correct wheel, you may not be able to stop properly, and you could have other Wheel Replacement problems like a tire air...
  • Page 256: Appearance Care

    Appearance Care NOTICE: Remember, cleaning products can be hazardous. Some are toxic. Others can burst into flame if you strike a The wrong wheel can cause trouble in bearing match or get them on a hot part of the vehicle. Some are life, brake cooling, speedometer/odometer dangerous if you breathe their fumes in a closed space.
  • Page 257: Cleaning The Inside Of Your Vehicle

    Don’t use any of these unless this manual says you can. Carefully scrape off any excess stain. In many uses, these will damage your vehicle: Use a clean cloth or sponge, and change to a Alcohol clean area often. A soft brush may be used if stains are stubborn.
  • Page 258: Special Fabric Cleaning Problems

    Special Fabric Cleaning Problems Cleaning Vinyl Stains caused by such things as catsup, coffee (black), Use warm water and a clean cloth. egg, fruit, fruit juice, milk, soft drinks, vomit, urine and Rub with a clean, damp cloth to remove dirt. blood can be removed as follows: You may have to do it more than once.
  • Page 259: Care Of Safety Belts

    Care of Safety Belts Cleaning the Outside of the Windshield and Wiper Blades Keep belts clean and dry. If the windshield is not clear after using the windshield washer, or if the wiper blade chatters when running, CAUTION: wax, sap or other material may be on the blade or windshield.
  • Page 260: Cleaning The Outside Of Your Vehicle

    Weatherstrips All cleaning agents should be flushed promptly and not allowed to dry on the surface, or they could stain. Dry Silicone grease on weatherstrips will make them last the finish with a soft, clean chamois or an all cotton longer, seal better, and not stick or squeak.
  • Page 261 Use special care with aluminum trim. To avoid NOTICE: damaging protective trim, never use auto or chrome polish, steam or caustic soap to clean aluminum. A coating of wax, rubbed to high polish, is recommended Machine compounding or aggressive polishing on for all bright metal parts.
  • Page 262: Cleaning Tires

    Cleaning Tires Sheet Metal Damage To clean your tires, use a stiff brush with a tire cleaner. If your vehicle is damaged and requires sheet metal repair or replacement, make sure the body repair shop applies anti corrosion material to the parts repaired or NOTICE: replaced to restore corrosion protection.
  • Page 263: Underbody Maintenance

    Underbody Maintenance At least every spring, flush these materials from the underbody with plain water. Clean any areas where mud Chemicals used for ice and snow removal and dust and other debris can collect. Dirt packed in closed areas control can collect on the underbody. If these are not of the frame should be loosened before being flushed.
  • Page 264 GM Vehicle Care/Appearance Materials PART NUMBER SIZE DESCRIPTION USAGE 994954 23 in. x 25 in. Polishing Cloth – Wax Treated Exterior polishing cloth 1050172 16 oz. (0.473 L) Tar and Road Oil Remover Removes tar, road oil and asphalt 1050173 16 oz.
  • Page 265: Engine Identification

    Vehicle Identification Number (VIN) Service Statement One of these statements is on your Certification/Tire label. Here is what each one means. TRUCK SERVICE A vehicle made to carry property or special equipment. It is made for uniform frame loading. That includes using the vehicle to pull a full trailer.
  • Page 266: Electrical System

    Service Parts Identification Label Electrical System You’ll find this label in a location determined by the Add-On Electrical Equipment body manufacturer. It’s very helpful if you ever need to order parts. On this label is: NOTICE: your VIN, the model designation, Don’t add anything electrical to your vehicle paint information and unless you check with your dealer first.
  • Page 267: Headlamp Wiring

    Headlamp Wiring The hydraulic brake booster motor feed circuit and starter relay circuit are protected by a fusible link. The headlamp wiring is protected by a circuit breaker in Vehicles with a diesel engine have a fusible link for the the light switch.
  • Page 268 Instrument Panel Circuit Breaker Block These circuit breakers are non cycling; do not replace them with cycling circuit breakers. Also, don’t use This fuse block is in the lower portion of the instrument circuit breakers of higher amperage than those indicated panel, to the left of the steering column.
  • Page 269 Name Circuits Protected Name Circuits Protected HYD BRK Brake Pump Motor Relay, CHAS Air Suspension Dump Valve, Alarm Module Air Dryer, HYD ABS ECU, Dual Fuel Tank Module, ENG1 Engine Control Module Auxiliary Fuel Pump (Diesel Engines), Canister Purge, Electronic Throttle Control, Mass PARK LP Auxiliary Wiring, Parking Lamps, Air Flow, Engine Control Module...
  • Page 270 Name Circuits Protected ENG2 Ignition Coils (Even), Fuel Injectors Even Bank (Gasoline Engines), Vehicle Interface Module Battery (Diesel Engines), Transmission Control Module Battery (Diesel Engines) CRNK Starter Relay, Ether Start (Diesel Engines) IGN SW Instrument Panel Cluster Telltales, Daytime Running Lamp Module, Daytime Running Lamp Relay, Alarm Module, Ignition 1 Relay, Vehicle Interface Module (Diesel...
  • Page 271 Name Circuits Protected Name Circuits Protected HYD BRK Brake Pump Motor Relay TRN/HAZ Turn Signal Lamps, Hazard Lamps ENG1 Engine Control Module (Diesel CHAS Exhaust Brake, Air Suspension Engines), Canister Purge, Oxygen Dump Valve, Air Dryer, HYD Sensors (Gasoline Engines) ABS ECU, Dual Fuel Tank B/U IGN3 Fuel Filter Relay, Blower Motor...
  • Page 272 Maxi Fuse Block Name Circuits Protected When a circuit goes out, first check the instrument panel CIG/AUX Cigarette Lighter, Auxiliary circuit breaker block. If no circuit breakers are out there, Power Jacks the problem could be in the maxi fuse block. Auxiliary Wiring (Battery) This block uses blade type fuses.
  • Page 273 Power is fed through these fuses to devices such as the headlamp switch, ignition switch feed circuits and the auxiliary brake pump (hydraulic brake vehicles). Be sure to replace maxi fuses with maxi fuses of the same rating. Do not use maxi fuses of higher amperage than those indicated on the maxi fuse block.
  • Page 274: Capacities And Specifications

    Replacement Bulbs Name Circuits/Circuit Breakers Protected HEAD LAMP Headlamps, Daytime It is recommended that you use an AC type bulb Running Lamps whenever you need to replace one. AUX WRG Auxiliary, Parking Brake Before you replace any bulbs, be sure that all lamps are IGN SW1 Ignition Switch, Wash/Wipe, off and the engine isn’t running.
  • Page 275: Fuel Tank Capacity

    Cooling System Capacity *Additional oil is required with auxiliary oil filter systems. Make sure to add enough extra oil to fill the Model Quarts (Liters) auxiliary oil filter system. For vehicles equipped with 7.2L with manual transmission ..32.0 (30.0) the LUBERFINER 750 C, add 14 quarts (13.25 L).
  • Page 276 Transmission Capacity Rear Axle Lubricant Capacity Single Speed Axle Lubricant, Pints (Liters) Capacities (volumes) shown are approximate. For manual transmissions, the correct oil level is to the 15040S ......21.0 (10.1) bottom of the fluid fill plug opening.
  • Page 277: Normal Maintenance Replacement Parts

    Normal Maintenance Tandem Axles Lubricant, Pints (Liters) DS344 (front) ..... . . 31.0 (14.5) Replacement Parts RS344 (rear) ......28.0 (13.2) Allison Transmission External Filters DS454 (front)
  • Page 278 Service Replacement Part and Filter Recommendations Engine 7.2L 8.1L Spark Plug Denso Type TJ14R 0.060 inch (1.52 mm) Torque 14.75 lb. ft. (20.0 Nm) Oil Filter 1R0739 ACDelco Air Cleaner Donaldson P522606 ACDelco A1518C Fuel Filter ACDelco 915 Primary** ACDelco GF626* Secondary Fuel Filter 1R0751...
  • Page 279 Section 7 Scheduled Maintenance Services This section covers the maintenance required for your vehicle. Your vehicle needs these services to retain its safety, dependability and emission control performance. Introduction Part B: Owner Checks and Services Part A: Scheduled Maintenance Services Part C: Recommended Fluids and Lubricants Scheduled Maintenance Part D: Maintenance Record...
  • Page 280: Your Vehicle And The Environment

    Introduction Your Vehicle and the Environment Proper vehicle maintenance not only helps to keep your vehicle in good working condition, but also helps the environment. All recommended maintenance procedures are important. Improper vehicle maintenance can even affect the quality of the air we breathe. Improper fluid levels or the wrong tire inflation can increase the level of emissions from your vehicle.
  • Page 281: How This Section Is Organized

    How This Section is Organized “Part B: Owner Checks and Services” tells you what should be checked and when. It also explains This maintenance schedule is divided into four parts: what you can easily do to help keep your vehicle in good condition.
  • Page 282: Using Your Maintenance Schedule

    Part A: Scheduled The proper fluids and lubricants to use are listed in Part C. Make sure whoever services your vehicle uses Maintenance Services these. All parts should be replaced and all necessary repairs done before you or anyone else drives Using Your Maintenance Schedule the vehicle.
  • Page 283: Scheduled Maintenance

    Scheduled Maintenance 1,000 Miles (1 600 km) Wheel stud nut service. (46) The services shown in this schedule up to 100,000 miles (166 000 km) should be performed after 100,000 miles 3,000 Miles (5 000 km) (166 000 km) at the same intervals. The services shown Check Oil Life Monitor.
  • Page 284 6,000 Miles (10 000 km) (Continued) Wheels and tires service. (15)(46) Hydraulic brake service (or every 6 months, Hydraulic brake service (or every 6 months, whichever occurs first). (7) whichever occurs first). (7) Hydraulic parking brake service (or every 6 months, Hydraulic parking brake service (or every 6 months, whichever occurs first).
  • Page 285 Spring axle U bolts and shackle Clutch pedal free travel service. (10) bolts service. (16) Clean air brake application valve (or every 3 months, Exhaust system service (or every 6 months, or every 300 hours, whichever occurs first); whichever occurs first). (3)(4)(17) lubricate linkage.
  • Page 286 24,000 Miles (40 000 km)(Continued) 27,000 Miles (45 000 km) Wheels and tires service. (15)(46) Check Oil Life Monitor. If engine oil and filter are changed, reset monitor. See “Engine Oil” Hydraulic brake service (or every 6 months, in the Index. (3)(9) whichever occurs first).
  • Page 287 Air brake service (or every 6 months, whichever Chassis lubrication service (or every 6 months, occurs first). (39) whichever occurs first). (12) Lubricate door hinge pins and rollers with engine oil. Inspect door hinge pins and bushings and replace as necessary. Lubricate door hinge pins and rollers Wheels and tires service.
  • Page 288 39,000 Miles (65 000 km) 45,000 Miles (75 000 km) Check Oil Life Monitor. If engine oil and filter Check Oil Life Monitor. If engine oil and filter are changed, reset monitor. See “Engine Oil” are changed, reset monitor. See “Engine Oil” in the Index.
  • Page 289 Lubricate door hinge pins and rollers with engine oil. Air brake chamber service (or every 2 months, whichever occurs first). (41) Wheel bearing (grease type) service (or every 24 months, whichever occurs first, and whenever Trailer brake hand control valve service (or every hubs are removed).
  • Page 290 54,000 Miles (90 000 km) (Continued) 60,000 Miles (100 000 km) Wheels and tires service. (15)(46) Check Oil Life Monitor. If engine oil and filter are changed, reset monitor. See “Engine Oil” Hydraulic brake service (or every 6 months, in the Index. (3)(9) whichever occurs first).
  • Page 291 Wheels and tires service. (15)(46) 66,000 Miles (110 000 km) Hydraulic brake service (or every 6 months, Check Oil Life Monitor. If engine oil and filter whichever occurs first). (7) are changed, reset monitor. See “Engine Oil” in the Index. (3)(9) Hydraulic parking brake service (or every 6 months, whichever occurs first).
  • Page 292 72,000 Miles (120 000 km) Clutch pedal free travel service. (10) Thermostatically controlled engine cooling Check Oil Life Monitor. If engine oil and filter fan service. (4)(20) are changed, reset monitor. See “Engine Oil” in the Index. (3)(9) Shields and underhood insulation service. (4)(5)(21) Check fluid levels (or every 3 months, whichever Air intake system service (or every 24 months, occurs first).
  • Page 293 75,000 Miles (125 000 km) Lubricate door hinge pins and rollers with engine oil. Wheels and tires service. (15)(46) Check Oil Life Monitor. If engine oil and filter are changed, reset monitor. See “Engine Oil” Hydraulic brake service (or every 6 months, in the Index.
  • Page 294 84,000 Miles (140 000 km) (Continued) 90,000 Miles (150 000 km) Lubricate door hinge pins and rollers with engine oil. Check Oil Life Monitor. If engine oil and filter are changed, reset monitor. See “Engine Oil” Wheels and tires service. (15)(46) in the Index.
  • Page 295 Wheels and tires service. (15)(46) 96,000 Miles (160 000 km) Hydraulic brake service (or every 6 months, Check Oil Life Monitor. If engine oil and filter whichever occurs first). (7) are changed, reset monitor. See “Engine Oil” in the Index. (3)(9) Hydraulic brake caliper service (or every 6 months, whichever occurs first).
  • Page 296 96,000 Miles (160 000 km) (Continued) 100,000 Miles (166 000 km) Shields and underhood insulation service. (4)(5)(21) Change power steering fluid (or every 24 months, whichever occurs first). (13) Air intake system service (or every 24 months, whichever occurs first). (4)(5)(24) Replace power steering reservoir filter element (or every 24 months, whichever occurs first).
  • Page 297 200,000 Miles (320 000 km) Footnotes Remove, disassemble, clean and inspect the air brake = The U.S. Environmental Protection Agency or the trailer supply valve (or every 2 years, or 7,200 hours, California Air Resources Board has determined that the whichever occurs first).
  • Page 298 (7) = Inspect brake lines and hoses for proper hook The system won’t detect dust in the oil. So if you drive binding, leaks, cracks, chafing, etc. Inspect disc brake in a dusty area, be sure to change your oil and filter pads for wear and rotors for surface condition.
  • Page 299 (12) = Chassis Lubrication Service: Lubricate all grease Inspect power steering hoses, tubes and fittings for fittings in front suspension, front axle, steering linkage leaks. Hoses and lines must not be twisted, kinked or and steering gear at output shaft sleeve bearing. DO tightly bent.
  • Page 300 (17) = Check complete exhaust system and cab areas filled type Some wheel bearings are lubricated near the exhaust system for broken, damaged, missing or by rear axle lubricant. When you have oil filled position parts. Also inspect for open seams, hubs, use lubricant identical to that used in your rear holes, loose connections or other conditions which could axle.
  • Page 301 (28) = Replace spark plugs. Inspect wires for damage. (38) = Front axle service: Re pack upper kingpin Check the wire boot and boot heat shield fit at spark roller bearing. plugs and coil. Replace parts as needed. (39) = Air brake service: (30) = Check the fuel tank, fuel cap and fuel lines for Inspect brake lines and hoses for proper hook damage which could cause leakage.
  • Page 302 = Clean and lubricate air brake automatic slack (47) = Service is required now if you operate under any adjuster. Check pushrod travel and auto adjustment of these Short Trip/City conditions: operation. Have serviced if needed. Most trips are less than 5 to 10 miles (8 to 16 km). (41) = Air brake chamber service: Check operation, This is particularily important when outside mounting, clamps and air lines and check for leaks.
  • Page 303: At Each Fuel Fill

    Part B: Owner Checks and Services Engine Oil Level Check Check the engine oil level and add the proper oil if Listed in this part are owner checks and services which necessary. See “Engine Oil” in the Index for should be performed at the intervals specified to help further details.
  • Page 304: At Least Twice A Year

    At Least Twice a Year Body Lubrication Service Lubricate all exposed surfaces such as door checks, door Restraint System Check lock bolts, lock strike plates, door hinge bushings and Make sure the safety belt reminder light (if equipped) dovetail bumper wedges. Where oil holes are provided a and all your belts, buckles, latch plates, retractors and dripless oil can be used.
  • Page 305 Starter Switch Check Automatic Transmission Shift Indicator Check Check that the indicator points to the gear chosen. CAUTION: Steering Check Be alert for any changes in steering action, abnormal When you are doing this check, the vehicle could front tire wear or steering wheel position. An inspection move suddenly.
  • Page 306 Engine Cooling System Service Mirrors and Sun Visors Check Inspect the hoses and have them replaced if they are Check that friction joints hold mirrors and sun visors cracked, swollen or deteriorated. Inspect all pipes, in place. fittings and clamps; replace as needed. Clean the outside Seat Adjuster Check of the radiator and air conditioning condenser.
  • Page 307 Door Latches Check Take care to clean well any areas where mud and other debris can collect. Sediment packed in closed areas of Check that doors close, latch and lock tightly. Check for the frame should be loosened before being flushed. broken, damaged or missing parts that might prevent tight latching.
  • Page 308 Part C: Recommended Fluids USAGE FLUID/LUBRICANT and Lubricants Engine 50/50 mixture of clean, drinkable NOTE: Fluids and lubricants identified below by name, Coolant (GM water and use only GM part number or specification may be obtained from Gasoline Engine) Goodwrench COOL your dealer.
  • Page 309 USAGE FLUID/LUBRICANT USAGE FLUID/LUBRICANT Exhaust Brake High Temperature Grease Manual Synthetic Manual Transmission Ball Joint (GM Part No. 1051344 Transmission Fluid (GM Part No. 12345724) is Cap Lubricant or equivalent) or the recommended lubricant to use. NLGI #3 consistency. Automatic See the Allison Transmission Spring DEXRON...
  • Page 310 USAGE FLUID/LUBRICANT USAGE FLUID/LUBRICANT Front Wheel SAE 75W 90 Synthetic Axle Propshafts Wheel bearing lubricant meeting Bearings with Lubricant for Medium Duty and Splines requirements of NLGI # 2, Oil Filled Hubs Trucks (GM Part No. 12345841 Category GC or GC LB (GM Part or equivalent).
  • Page 311: Maintenance Record

    Part D: Maintenance Record After the scheduled services are performed, enter the date, odometer reading and services performed on the maintenance record charts provided here. Any additional information from “Owner Checks and Services” can be added on the following record pages. Also, you should retain all maintenance receipts. Your owner information portfolio is a convenient place to store them.
  • Page 315 Orders will be mailed within 10 days of receipt. Please allow adequate time for postal ORDER TOLL FREE service. If further information is needed, write to the address shown below or call (NOTE: For Credit Card Holders Only) 1-800-551-4123. Material cannot be returned for credit without packing slip with return 1-800-551-4123 information within 30 days of delivery.
  • Page 316: Customer Assistance Information

    Section 8 Customer Assistance Information Here you will find out how to contact GMC if you need assistance. This section also tells you how to obtain service publications and how to report any safety defects. Customer Satisfaction Procedure Reporting Safety Defects to the United...
  • Page 317 Customer Satisfaction Procedure Your satisfaction and goodwill are important to your dealer and to GMC. Normally, any concerns with the sales transaction or the operation of your vehicle will be resolved by your dealer’s sales or service departments. Sometimes, however, despite the best intentions of all concerned, misunderstandings can occur.
  • Page 318: Customer Assistance Offices

    Please have the GMC encourages customers to call the toll-free number following information available to give the Customer for assistance. If a U.S. customer wishes to write to GMC, Assistance Representative: the letter should be addressed to GMC’s Medium Duty Vehicle Identification Number (This is available Truck Customer Assistance Center.
  • Page 319 Canada Mexico, Central America and Caribbean Islands/Countries (Except Puerto Rico and General Motors of Canada Limited U.S. Virgin Islands) Customer Communication Centre, 163-005 1908 Colonel Sam Drive General Motors de Mexico, S. de R.L. de C.V. Oshawa, Ontario L1H 8P7 Customer Assistance Center Paseo de la Reforma # 2740 1-800-263-3777 (English)
  • Page 320: Roadside Assistance

    Roadside Assistance is available 24 hours a day, 7 days a week, 365 days a year, including weekends and holidays. Should you have any questions about Roadside Assistance, call the GMC Roadside Assistance Center or contact your dealer. Warranty Information GM Medium Duty Truck’s Roadside Assistance...
  • Page 321 REPORTING SAFETY REPORTING SAFETY DEFECTS TO DEFECTS TO THE UNITED THE CANADIAN GOVERNMENT STATES GOVERNMENT If you live in Canada, and you believe that your vehicle has a safety defect, you should immediately notify If you believe that your vehicle has a defect which Transport Canada, in addition to notifying General could cause a crash or could cause injury or death, Motors of Canada Limited.
  • Page 322: Reporting Safety Defects To General Motors

    1908 Colonel Sam Drive us. Please call us at 1 8782 Oshawa, Ontario L1H 8P7 8782), or write: GMC Medium Duty Truck Customer Assistance Center P.O. Box 33172 Detroit, MI 48232 5172...
  • Page 323 2001 GMC SERVICE PUBLICATIONS ORDERING INFORMATION The following publications covering the operation and servicing of your vehicle can be purchased by filling out the Service Publication Order Form in this book and mailing it in with your check, money order, or credit card information to Helm, Incorporated (address below.)
  • Page 324 DAYTIME TELEPHONE NO. CUSTOMER SIGNATURE AREA CODE GM-GMC-ORD99 *(Prices are subject to change without notice and without incurring Note to Canadian Customers: All listed prices are quoted in U.S. funds. Canadian residents obligation. Allow ample time for delivery.)

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