GM Service Manual Online
For 1990-2009 cars only

Tools Required

J 39400-A Halogen Leak Detector

Removal Procedure

  1. Recover the refrigerant. Refer to Refrigerant Recovery and Recharging .
  2. Drain the cooling system. Refer to Cooling System Draining and Filling .
  3. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle .

  4. Object Number: 735776  Size: SH
  5. Remove the nuts (3) from rear A/C line block fittings.
  6. Important: Cap or tape the open A/C refrigerant lines immediately.

  7. Remove the A/C line block fittings and discard the O-ring seals.

  8. Object Number: 400657  Size: SH
  9. Remove the heater hoses from the HVAC module-auxiliary.
  10. Remove the nuts from the HVAC module studs.
  11. Lower the vehicle.
  12. Remove the right side rear quarter trim. Refer to Rear Quarter Trim Panel Replacement - Right Side .

  13. Object Number: 735895  Size: SH
  14. Disconnect the electrical connectors from the HVAC module.
  15. Disconnect the rear compartment air outlet ducts (5) from the HVAC module (3).

  16. Object Number: 735953  Size: SH
  17. Remove the mounting bolts (5) from the HVAC module.
  18. Remove the HVAC module (1).
  19. Remove and discard the HVAC module pass through seal.

Installation Procedure

  1. Install new HVAC module pass through seal. Refer to Auxiliary HVAC Module Pass Thru Seal Replacement .

  2. Object Number: 735953  Size: SH
  3. Install the HVAC module (1).
  4. Notice: Refer to Fastener Notice in the Preface section.

  5. Install the HVAC module mounting bolts (5).
  6. Tighten
    Tighten the bolts to 10 N·m (89 lb in).


    Object Number: 735895  Size: SH
  7. Install the air outlet ducts (5).
  8. Connect the electrical connectors.
  9. Install the right side rear quarter trim panel. Refer to Rear Quarter Trim Panel Replacement - Right Side .
  10. Raise and support the vehicle.

  11. Object Number: 400657  Size: SH
  12. Connect the heater hoses to the heater core.
  13. Remove the cap or tape from the A/C lines.
  14. Install the new O-ring seals. Refer to O-Ring Replacement .

  15. Object Number: 735776  Size: SH
  16. Install the nuts (3) to the evaporator core studs.
  17. Tighten
    Tighten the nuts to 20 N·m (15 lb ft).

  18. Lower the vehicle.
  19. Fill the cooling system. Refer to Cooling System Draining and Filling .
  20. Evacuate and charge the system. Refer to Refrigerant Recovery and Recharging .
  21. Leak test the fittings of the components using the J 39400-A .