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Chevrolet 2000-01 Manual
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Chevrolet 2000-01 Manual

Chevrolet 2000-01 Manual

Automatic a/c-heater systems for 2001 corvette
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SPECIFICATIONS
SPECIFICATIONS
Application
Compressor Type
Compressor Belt Tension
System Oil Capacity
Refrigerant (R-134a) Capacity
System Operating Pressures
Low Side
High Side
(1)
Belt tension is adjusted by automatic belt tensioner.
(2)
Use PAG Oil (Polyalkylene glycol, Part No. 12345923).
(3)
Specifications with engine speed at 1000 RPM, ambient temperature at 80°F (27°C).
DESCRIPTION
WARNING:
Automatic, dual-zone A/C-heater system uses 2 bi-directional electric motors to position each
temperature door. Driver may select desired interior temperature, fan speed and up to 8 modes of
operation. During AUTO mode, system automatically adjusts discharge locations, fan speed and
discharge air temperature to maintain desired interior temperature. Passenger knob of control
panel can adjust discharge temperature for passenger side of vehicle. A memory zone is available
which can store specific settings and recall them at any time.
A/C system is a Variable Displacement Orifice Tube (VDOT) type. Compressor engagement is
controlled by Powertrain Control Module (PCM). The VDOT utilizes a variable displacement
2001 Chevrolet Corvette
2001 Chevrolet Corvette
2000-01 AUTOMATIC A/C-HEATER SYSTEMS Corvette
2000-01 AUTOMATIC A/C-HEATER SYSTEMS Corvette
2000-01 AUTOMATIC A/C-HEATER SYSTEMS
(3)
To avoid injury from accidental air bag deployment, read and
carefully follow all SERVICE PRECAUTIONS and DISABLING &
ACTIVATING AIR BAG SYSTEM procedures in AIR BAG
SYSTEM SAFETY article in GENERAL SERVICING.
Corvette
Specification
Harrison V7
(1)
(2)
9 ozs.
24 ozs.
2
26 psi (1.8 kg/cm
)
179 psi (12.5
2
kg/cm
)

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Summary of Contents for Chevrolet 2000-01

  • Page 1 2001 Chevrolet Corvette 2001 Chevrolet Corvette 2000-01 AUTOMATIC A/C-HEATER SYSTEMS Corvette 2000-01 AUTOMATIC A/C-HEATER SYSTEMS Corvette 2000-01 AUTOMATIC A/C-HEATER SYSTEMS Corvette SPECIFICATIONS SPECIFICATIONS Application Specification Compressor Type Harrison V7 Compressor Belt Tension System Oil Capacity 9 ozs. Refrigerant (R-134a) Capacity 24 ozs.

  • Page 2: Operation

    2001 Chevrolet Corvette 2000-01 AUTOMATIC A/C-HEATER SYSTEMS Corvette compressor which can maintain A/C demand under all conditions without cycling on and off. Combined with Variable Displacement Orifice Tube (VDOT) system, HVAC control head regulates blower motor fan speed and generates command signals to A/C-heater programmer and blower control module.
  • Page 3 2001 Chevrolet Corvette 2000-01 AUTOMATIC A/C-HEATER SYSTEMS Corvette Defrost Mode Button In this mode, A/C compressor is engaged to remove moisture in air. Air is then heated and most air is directed to windshield, with a small amount directed to floor outlet. Fan motor speed is selected by driver.
  • Page 4 2001 Chevrolet Corvette 2000-01 AUTOMATIC A/C-HEATER SYSTEMS Corvette pressing OSA button. Recirculation Mode Button In this mode, maximum cooling is provided by recirculating passenger compartment air with a small amount of outside air. Recirculation mode is used for maximum cooling during A/C operation and during defrost/defog modes.
  • Page 5 2001 Chevrolet Corvette 2000-01 AUTOMATIC A/C-HEATER SYSTEMS Corvette Fig. 1: Identifying HVAC Control Head Courtesy of GENERAL MOTORS CORP. AMBIENT TEMPERATURE SENSOR Ambient Temperature Sensor (ATS) is located on right side of radiator upper support. Sensor resistance changes as temperature of air outside of vehicle changes. Sensor low current signal corresponds to actual temperature of outside air.

  • Page 6: Troubleshooting

    2001 Chevrolet Corvette 2000-01 AUTOMATIC A/C-HEATER SYSTEMS Corvette INSIDE TEMPERATURE SENSOR Inside Temperature Sensor (ITS) is located on right side of steering column, next to ignition switch, in a dedicated vent. Sensor resistance changes as temperature of air inside vehicle changes.
  • Page 7 2001 Chevrolet Corvette 2000-01 AUTOMATIC A/C-HEATER SYSTEMS Corvette begins with a "U" indicates that some other module is not communicating. If scan tool does not display any DTCs that begin with "U", go to next step. 5. If scan tool displays any DTCs which begin with B10xx (xx represents any 2 other characters), see DTC list in appropriate BODY CONTROL MODULES article in ACCESSORIES &...
  • Page 8 2001 Chevrolet Corvette 2000-01 AUTOMATIC A/C-HEATER SYSTEMS Corvette instrument panel electrical center and terminal "B" of blower motor control module and go to step 9 . If BLO MOT fuse is not blown, repair open or high resistance in Red wire between instrument panel electrical center and terminal "B"...
  • Page 9 2001 Chevrolet Corvette 2000-01 AUTOMATIC A/C-HEATER SYSTEMS Corvette 3. Remove A/C CLU relay from underhood electrical center. Disconnect A/C compressor clutch harness connector. Check continuity between ground and Dark Green wire terminal of A/C compressor clutch harness connector. If continuity exists, go to next step. If continuity does not exist, repair open or high resistance in Dark Green wire between A/C CLU relay and terminal No.
  • Page 10 2001 Chevrolet Corvette 2000-01 AUTOMATIC A/C-HEATER SYSTEMS Corvette 1. Perform diagnostic system check. See DIAGNOSTIC SYSTEM CHECK under TROUBLE SHOOTING. After diagnostic system check, go to next step. 2. Start engine and allow to idle in park. Use scan tool to display HVAC data list. Switch HVAC control through the following operating modes.
  • Page 11 2001 Chevrolet Corvette 2000-01 AUTOMATIC A/C-HEATER SYSTEMS Corvette resistance in Brown wire between fuse No. 27 (10-amp) in instrument panel electrical center (fuse block) and vacuum/electric solenoid. After repair, go to step 7 . 6. Measure voltage between terminal No. 6 (Brown wire) of vacuum/electric solenoid and terminals D8 (Dark Green wire), D9 (Light Green wire), D10 (Purple wire), D11 (Light Green wire) and D13 (Pink wire) of HVAC control head.
  • Page 12 2001 Chevrolet Corvette 2000-01 AUTOMATIC A/C-HEATER SYSTEMS Corvette Dark Blue wire between terminal No. 6 of right air temperature actuator and terminal C7 of HVAC control head. If continuity exists, go to step 7 . If continuity does not exist, repair open in Dark Blue wire and go to step 10 .

  • Page 13: Self-Diagnostics

    2001 Chevrolet Corvette 2000-01 AUTOMATIC A/C-HEATER SYSTEMS Corvette repair open in White/Black wire and go to step 7 . 5. Replace right air temperature actuator. See AIR TEMPERATURE ACTUATORS under REMOVAL & INSTALLATION and go to step 7 . 6. Replace HVAC control head. See HVAC CONTROL HEAD under REMOVAL &...

  • Page 14: Diagnostic Tests

    2001 Chevrolet Corvette 2000-01 AUTOMATIC A/C-HEATER SYSTEMS Corvette Right Actuator Feedback Short To Ground B0365 Right Actuator Feedback Short To Ground B0365 B0367 Right Actuator Feedback Open B0367 Right Actuator Feedback Open Left Actuator Out Of Range B0441 Right Actuator Out Of Range...
  • Page 15 2001 Chevrolet Corvette 2000-01 AUTOMATIC A/C-HEATER SYSTEMS Corvette 50 (10) 19,903 68 (20) 12,493 86 (30) 8,056 104 (40) 5,327 122 (50) 3,603 140 (60) 2,488 INSIDE AIR TEMPERATURE SENSOR RESISTANCE Temp. - °F (°C) Counts Volts Resistance (Ohms) -40 (-40) 4.86...
  • Page 16 2001 Chevrolet Corvette 2000-01 AUTOMATIC A/C-HEATER SYSTEMS Corvette Diagnostic Procedure 1. Perform diagnostic system check. See DIAGNOSTIC SYSTEM CHECK under TROUBLE SHOOTING. Go to next step. 2. Connect scan tool. Turn ignition on. Observe OUTSIDE AIR TEMP SENSOR in HVAC data list.
  • Page 17 2001 Chevrolet Corvette 2000-01 AUTOMATIC A/C-HEATER SYSTEMS Corvette DIAGNOSTICS. Operate vehicle and verify that DTCs do not reset. If DTCs reset, go to step 2 . If DTCs do not reset, system is okay. DTC B0333: AMBIENT AIR TEMPERATURE SENSOR OPEN Diagnostic Aids If DTC is intermittent or has a history, perform tests while wiggling wiring and connectors.
  • Page 18 2001 Chevrolet Corvette 2000-01 AUTOMATIC A/C-HEATER SYSTEMS Corvette temperature sensor and terminal D3 of HVAC control module. If continuity exists, go to next step. If continuity does not exist, repair open or high resistance in Light Green/Black wire and go to step 12 .
  • Page 19 2001 Chevrolet Corvette 2000-01 AUTOMATIC A/C-HEATER SYSTEMS Corvette 3. Turn ignition off. Disconnect inside air temperature sensor. Turn ignition on. Use scan tool to observe INSIDE AIR TEMPERATURE SENSOR parameter. If scan tool indicates more than 4.9 volts, go to next step. If scan tool indicates 4.9 volts or less, go to step 5 .
  • Page 20 2001 Chevrolet Corvette 2000-01 AUTOMATIC A/C-HEATER SYSTEMS Corvette If DTC is intermittent or has a history, perform tests while wiggling wiring and connectors. This can often cause malfunction to appear. Inspect sensor connector and harness for damage, corrosion or water intrusion. Check for adequate terminal tension, harness routing, damaged wire insulation, and broken wires.
  • Page 21 2001 Chevrolet Corvette 2000-01 AUTOMATIC A/C-HEATER SYSTEMS Corvette and terminal D1 of HVAC control head and go to step 12 . 8. Check for loose wires and or poor connections of inside air temperature sensor. Repair any problems found and go to step 12 . If wiring and connectors are okay, go to step 10 .
  • Page 22 2001 Chevrolet Corvette 2000-01 AUTOMATIC A/C-HEATER SYSTEMS Corvette 5. Turn ignition off. Check continuity between ground and terminal "A" (Light Blue/Black wire) of sunload temperature sensor harness connector. If continuity exists, repair short to ground in Dark Green wire between inside sunload temperature sensor and terminal D2 of HVAC control head harness connector.
  • Page 23 2001 Chevrolet Corvette 2000-01 AUTOMATIC A/C-HEATER SYSTEMS Corvette scan tool to monitor LH MIX MTR POSITION FEEDBACK. A normal position feedback signal should range between 0-255 counts as electric actuator is being moved. Diagnostic Procedure 1. Perform diagnostic system check. See DIAGNOSTIC SYSTEM CHECK under TROUBLE SHOOTING.
  • Page 24 2001 Chevrolet Corvette 2000-01 AUTOMATIC A/C-HEATER SYSTEMS Corvette head and go to step 15 . If continuity does not exist, go to step 12 . 9. Measure voltage between ground and terminal No. 9 (Light Blue wire) of left air temperature actuator harness connector.
  • Page 25 2001 Chevrolet Corvette 2000-01 AUTOMATIC A/C-HEATER SYSTEMS Corvette Diagnostic Procedure 1. Perform diagnostic system check. See DIAGNOSTIC SYSTEM CHECK under TROUBLE SHOOTING. Go to next step. 2. Connect scan tool. Turn ignition on. Observe LH MIX MTR POSITION FEEDBACK parameter in HVAC data list. If scan tool indicates LH MIX MTR POSITION FEEDBACK parameter is between 5-250 counts, see DIAGNOSTIC AIDS .
  • Page 26 2001 Chevrolet Corvette 2000-01 AUTOMATIC A/C-HEATER SYSTEMS Corvette 9. Measure voltage between ground and terminal No. 9 (Light Blue wire) of left air temperature actuator. If voltage exists, repair short to voltage in Light Blue wire between left air temperature actuator and terminal C8 of HVAC control head. If voltage does not exist, check continuity in Light Blue wire between terminal No.
  • Page 27 2001 Chevrolet Corvette 2000-01 AUTOMATIC A/C-HEATER SYSTEMS Corvette 1. Perform diagnostic system check. See DIAGNOSTIC SYSTEM CHECK under TROUBLE SHOOTING. Go to next step. 2. Connect scan tool. Turn ignition on. Observe RH MIX MTR POSITION FEEDBACK parameter in HVAC data list. If scan tool indicates RH MIX MTR POSITION FEEDBACK parameter is between 5-250 counts, see DIAGNOSTIC AIDS .
  • Page 28 2001 Chevrolet Corvette 2000-01 AUTOMATIC A/C-HEATER SYSTEMS Corvette step 15 . If voltage does not exist, go to next step. 10. Check continuity in Gray/Black wire between terminal No. 7 of right air temperature sensor and terminal D1 of HVAC control head harness connector. If continuity exists, go to step 12 .
  • Page 29 2001 Chevrolet Corvette 2000-01 AUTOMATIC A/C-HEATER SYSTEMS Corvette indicates RH MIX MTR POSITION FEEDBACK parameter is not between 5-250 counts, go to next step. 3. Turn ignition off. Disconnect right air temperature actuator. Turn ignition on. Observe RH MIX MTR POSITION FEEDBACK parameter in HVAC data list. If scan tool indicates RH MIX MTR POSITION FEEDBACK parameter is 250 counts or more, go to next step.
  • Page 30 2001 Chevrolet Corvette 2000-01 AUTOMATIC A/C-HEATER SYSTEMS Corvette 10. Check continuity between ground and terminal No. 7 (Gray/Black wire) of right air temperature actuator. If continuity exists, go to step 12 . If continuity doe not exist, repair open in Gray/Black wire between right air temperature actuator and terminal D1 of HVAC control head and go to step 15 .
  • Page 31 2001 Chevrolet Corvette 2000-01 AUTOMATIC A/C-HEATER SYSTEMS Corvette indicates LH MIX MTR POSITION FEEDBACK parameter is not between 5-250 counts, go to next step. 3. Turn ignition off. Disconnect left air temperature actuator. Turn ignition on. Observe LH MIX MTR POSITION FEEDBACK parameter in HVAC data list. If scan tool indicates LH MIX MTR POSITION FEEDBACK parameter is more than 250 counts, go to next step.
  • Page 32 2001 Chevrolet Corvette 2000-01 AUTOMATIC A/C-HEATER SYSTEMS Corvette 10. Check continuity of Gray/Black wire between terminal No. 7 of left air temperature actuator and terminal D1 of HVAC control head. If continuity exists, go to step 15 . If continuity does not exist, go to step 12 .
  • Page 33 2001 Chevrolet Corvette 2000-01 AUTOMATIC A/C-HEATER SYSTEMS Corvette go to next step. 3. Turn ignition off. Disconnect right air temperature actuator. Turn ignition on. Observe RH MIX MTR POSITION FEEDBACK parameter in HVAC data list. If scan tool indicates RH MIX MTR POSITION FEEDBACK parameter is more than 250 counts, go to next step.

  • Page 34: System Tests

    2001 Chevrolet Corvette 2000-01 AUTOMATIC A/C-HEATER SYSTEMS Corvette 10. Check continuity between ground and terminal No. 7 (Gray/Black wire) of right air temperature actuator. If continuity exists, go to step 12 . If continuity does not exist, go to step 15 .

  • Page 35: Removal And Installation

    2001 Chevrolet Corvette 2000-01 AUTOMATIC A/C-HEATER SYSTEMS Corvette Fig. 2: A/C-Heater System Functional Test Chart & Mode Function Identification Courtesy of GENERAL MOTORS CORP. REMOVAL & INSTALLATION WARNING: To avoid injury from accidental air bag deployment, read and carefully follow all SERVICE PRECAUTIONS and DISABLING &...
  • Page 36 2001 Chevrolet Corvette 2000-01 AUTOMATIC A/C-HEATER SYSTEMS Corvette ACTIVATING AIR BAG SYSTEM procedures in AIR BAG SYSTEM SAFETY article in GENERAL SERVICING. NOTE: For removal and installation procedures not covered in this article, see MANUAL A/C-HEATER SYSTEMS - CORVETTE article.
  • Page 37 2001 Chevrolet Corvette 2000-01 AUTOMATIC A/C-HEATER SYSTEMS Corvette Fig. 3: Removing Ambient Air Temperature Sensor Courtesy of GENERAL MOTORS CORP. BLOWER MOTOR CONTROL MODULE WARNING: Unplug blower motor before removal. If blower motor case touches any ground while still hooked up to wiring harness, it will run and may cause personal injury.
  • Page 38 2001 Chevrolet Corvette 2000-01 AUTOMATIC A/C-HEATER SYSTEMS Corvette Remove passenger's side lower dashboard trim panel. Disconnect blower motor control module harness connector. Disconnect harness connector from blower motor. Loosen blower motor control module forward 2 retaining screws (closest to dash mat). Remove rear blower motor control module retaining screw.
  • Page 39 2001 Chevrolet Corvette 2000-01 AUTOMATIC A/C-HEATER SYSTEMS Corvette Disconnect negative battery cable. Remove instrument panel grille from instrument panel. Remove sunload temperature sensor from instrument panel wiring harness and instrument panel grille. See Fig. 4 . To install, reverse removal procedure.

  • Page 40: Torque Specifications

    2001 Chevrolet Corvette 2000-01 AUTOMATIC A/C-HEATER SYSTEMS Corvette removal procedure. See Fig. 5 . Fig. 5: Identifying Vacuum/Electric Solenoid Courtesy of GENERAL MOTORS CORP. TORQUE SPECIFICATIONS TORQUE SPECIFICATIONS Application Ft. Lbs. (N.m) A/C Compressor Line Bolt 19 (26) A/C Compressor Mounting Bolt...

  • Page 41: Wiring Diagrams

    2001 Chevrolet Corvette 2000-01 AUTOMATIC A/C-HEATER SYSTEMS Corvette A/C Pressure Sensor 42 (5) Accumulator Clamp Bracket Bolt 89 (10) Blower Motor Resistor Screw 14 (2) VACUUM DIAGRAMS Fig. 6: Automatic A/C-Heater System Vacuum Diagram (Corvette) Courtesy of GENERAL MOTORS CORP.
  • Page 42 2001 Chevrolet Corvette 2000-01 AUTOMATIC A/C-HEATER SYSTEMS Corvette...
  • Page 43 2001 Chevrolet Corvette 2000-01 AUTOMATIC A/C-HEATER SYSTEMS Corvette Fig. 7: Automatic A/C-Heater System Wiring Diagram (2000-01 Corvette)