Safety Maintenance - Chevrolet LIGHT DUTY TRUCK (SERIES 10-35) Service Manual

3. Stop engine and open radiator drain valve to drain
coolant. (Drainage may be speeded by removing drain plugs
in the block.)
4. Close drain valve (install block drain plugs, if
removed). Add water until system is filled.
5. Repeat steps 3, and 4 several times until the drained
liquid is nearly colorless.
6. Drain system and then close radiator drain valve
tightly. (Install block drain plugs, if removed.)
7. Remove recovery tank cap, leaving hoses in place.
Remove coolant recovery tank and empty fluid. Scrub and
clean inside of tank with soap and water. Flush well with
clean water and drain. Reinstall tank.
8. Add enough ethylene glycol solution, meeting GM
Specification 1899-M, and water to provide the required
cooling function as well as freezing and corrosion
protection. Use a 50 percent solution, -34°F (-36°C), but no
more than a 70 percent solution. Fill radiator to the base
of the radiator filler neck and raise level of coolant in the
recovery tank to the "Full Hot" mark. Reinstall recovery
tank cap.
9. Run engine, with radiator cap removed, until
radiator upper hose is hot.
10. With engine idling, add coolant to radiator until
level reaches bottom of filler neck. Install cap, making sure
arrows line up with overflow tube.
It is the owner's responsibility to:
• Maintain cooling system freeze protection at -34°F
(-37°C) to ensure protection against corrosion and loss of
coolant from boiling. This should be done even if freezing
temperatures are not expected.
• Add ethylene glycol base coolant that meets GM
Specification 1899-M when coolant has to be added because
of coolant loss or to provide added protection against
freezing at temperatures lower than -34°F (-37°C).
Alcohol or methanol base coolants or plain
NOTICE:
water alone should not be used in a vehicle at any time.
Radiator Pressure Cap
The radiator cap, a 15 psi (105 kPa) pressure type, must
be installed tightly, otherwise coolant may be lost and
damage to engine may result from overheating. Radiator
pressure caps should be checked periodically for proper
operation.
Thermostat
The engine coolant temperature is controlled by a
thermostat. It stops coolant flow through the radiator until
a pre-set temperature is reached. This thermostat is installed
on the engine block. The same thermostat is used in both
winter and summer.
A -1 1 M anu al Steering Gear
The steering gear is factory-filled with steering gear
lubricant. Seasonal change of this lubricant should not be
performed and the housing should not be drained-no
lubrication is required for the life of the steering gear.
Inspect for seal leakage (actual solid grease-not just oily
film). If a seal is replaced or the gear is overhauled, the gear
housing should be refilled only with the proper Steering
M AINTENANCE AND LUBRICATION
Gear Lubricant as noted below.
NOTICE: Use only 1052182 (13 oz. (.38L) container)
Steering Gear Lubricant
Specification 4673M, or its equivalent.
Do not use EP chassis lube, meeting GM
Specification 6031M, to lubricate the gear. DO NOT
OVER-FILL the gear housing.
A -1 2 C lutch Cross-Shaft
Remove the plug, install a lubrication fitting and
lubricate with water resistant EP Chassis Lubricant which
meets GM Specification 6031M.
A -1 3 A u to m atic Transm ission Fluid
Refer to A-1 for checking automatic transmission.
Change the transmission fluid and service screen every 15,-
000 miles (24 000 km) on light duty emissions or 12,000
miles (19 200 km) on heavy duty emission and diesel engine
vehicles if the vehicle has been driven under one or more
of these hot conditions:
• In heavy city traffic where the outside temperature
regularly reaches 90°F (32°C).
• In hill or mountain areas.
• Frequent trailer pulling.
• Uses such as taxi, police or delivery service. If the
vehicle was not used mainly under any of these conditions,
change the fluid and service screen each 100,000 miles (160
000 km) on light duty emissions and diesel engine vehicle
or 24,000 miles (38 400 km) on heavy duty emissions.
DO NOT OVERFILL it takes only one pint
NOTICE:
(0.5 litre) to raise level from "Add" to "Full" with a
hot transmission.
SECTION B

SAFETY MAINTENANCE

B-1 O w n er S a fe ty Checks -
The maintenance Schedule in the glove box lists items
to be checked by the owner.
B-2 Tires, W heels, and Disc Brakes
During tire rotation, check disc brake pads for wear,
and surface condition of rotors while wheels are removed
(see Item A-7). Check tires for excessive or abnormal wear,
or damage. Be sure wheels are not bent or cracked and that
wheel nuts have been tightened to the torque value shown
Section 3E.
B-3 Exhaust System
(Also an Emission Service— LDX)
Check the complete exhaust system, including the
catalytic converter. Check body areas near the exhaust
system and also the tailgate. Look for broken, damaged,
missing, or out-of-position parts. Also, inspect for open
seams, holes, loose connections, or other conditions which
could cause a heat build up in the floor pan, or could let
exhaust fumes seep into the passenger compartment. Dust
or water in the passenger compartment may indicate a leak
in the area. Needed repairs should be made at once. To help
maintain system integrity, replace the exhaust pipes and
OB-13
which meets GM
LIGHT DUTY T R U CK S ER V ICE MANUAL