GM Service Manual Online
For 1990-2009 cars only

Removal Procedure

Tools Required

    • J 39500-B R-134a Air Conditioning Refrigerant, Recovery, Recycling and Recharging (ACR4) System
    • J 37097-A Hose Clamp Remover/Installer

    Object Number: 247113  Size: SH

    Caution: This vehicle is equipped with a Supplemental Inflatable Restraint (SIR) System. Failure to follow the correct procedure could cause the following conditions:

       • Air bag deployment
       • Personal injury
       • Unnecessary SIR system repairs
    In order to avoid the above conditions, observe the following guidelines:
       • Refer to SIR Component Views in order to determine if you are performing service on or near the SIR components or the SIR wiring.
       • If you are performing service on or near the SIR components or the SIR wiring, disable the SIR system. Refer to Disabling the SIR System.

  1. Disable the SIR system. Refer to Disabling the SIR System in SIR.
  2. Recover the refrigerant from the A/C system. Refer to Refrigerant Recovery and Recharging .
  3. Remove the accumulator and evaporator tube fastener.
  4. Drain the cooling system. Refer to Cooling System Draining and Filling in Engine Cooling.

  5. Object Number: 247119  Size: SH
  6. Disconnect the tube connections at the evaporator.

  7. Object Number: 247330  Size: SH
  8. Remove the heater hoses from the heater core using the J 37097-A .
  9. Pinch off the hoses in order to prevent leaking.
  10. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.

  11. Object Number: 130710  Size: SH
  12. Remove the drain tube from the A/C module.
  13. Remove the steering column from the vehicle. Refer to Steering Column Replacement in Steering Wheel and Column - Tilt.
  14. Remove the IP assembly. Refer to Instrument Panel Assembly Removal in Instrument Panel, Gauges, and Console.

  15. Object Number: 247125  Size: SH
  16. Remove the defroster duct.

  17. Object Number: 247127  Size: SH
  18. Disconnect the blower control module (1) connection.
  19. Disconnect the instrument panel to A/C module harness connector.

  20. Object Number: 247142  Size: SH
  21. Remove the HVAC module retaining nuts (1-5).
  22. Remove the HVAC module.

Installation Procedure

Tools Required

    • J 39400 Electronic Halogen Leak Detector
    • J 37097-A Hose Clamp Remover/Installer

    Object Number: 247142  Size: SH
  1. Install the HVAC module.
  2. Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

  3. Install the HVAC module nuts to the dash (1-5). Refer to the illustration for the HVAC module fastener torque sequence.
  4. Tighten
    Tighten the nuts to 9 N·m (80 lb in).


    Object Number: 247127  Size: SH
  5. Connect the blower control module (1) connection.
  6. Connect the instrument panel to A/C module connector.

  7. Object Number: 247125  Size: SH
  8. Install the defroster duct and the module mounting screws.
  9. Tighten
    Tighten the screws to 3 N·m (23 lb in).

  10. Install the defroster duct to front of dash mounting nut.
  11. Tighten
    Tighten the screws to 9 N·m (65 lb in).

  12. Install the IP assembly. Refer to Instrument Panel Assembly Removal in Instrument Panel, Gauges, and Console.
  13. Install the steering column. Refer to Steering Column Replacement in Steering Wheel and Column - Tilt.

  14. Object Number: 247330  Size: SH
  15. Install the heater hoses to the heater core using the J 37097-A .

  16. Object Number: 247119  Size: SH
  17. Connect the evaporator and accumulator tube connections to the evaporator.

  18. Object Number: 247113  Size: SH
  19. Install the evaporator tube fastener.
  20. Tighten
    Tighten the fastener to 24 N·m (24 lb ft).


    Object Number: 130710  Size: SH
  21. Install the drain tube to the A/C module.
  22. Recover the refrigerant from the A/C system. Refer to Refrigerant Recovery and Recharging .
  23. Test the A/C system for leaks using the J 39400 . Refer to Leak Testing .
  24. Refill the engine coolant. Refer to Cooling System Draining and Filling in Engine Cooling.
  25. Enable the SIR system. Refer to Enabling the SIR System in SIR.