GM Service Manual Online
For 1990-2009 cars only

Tools Required

J 39400-A Halogen Leak Detector

Removal Procedure

  1. Recover the refrigerant from the A/C system. Refer to Refrigerant Recovery and Recharging .
  2. Important: The A/C compressor is accessed through the right wheel opening.

    Turn the steering wheel to the right before lifting the vehicle.

  3. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
  4. Remove the RH engine splash shield. Refer to Engine Splash Shield Replacement in Body Front End.
  5. Release the drive belt tensioner and remove the belt from the compressor pulley.

  6. Object Number: 125807  Size: SH
  7. Remove the air baffle bolts.
  8. Remove the air baffle.

  9. Object Number: 629105  Size: SH
  10. Disconnect the electrical connector from the compressor.
  11. Disconnect the engine harness electrical connector.
  12. Reposition the engine harness away from the compressor.


    Object Number: 628879  Size: SH
  13. Remove the suction hose nut.
  14. Disconnect the suction hose from the compressor.
  15. Important: Cap or tape the open A/C lines immediately, to prevent system contamination.

  16. Remove the suction hose from the compressor.
  17. Cap off the suction port of the compressor.
  18. Remove the discharge hose nut.
  19. Disconnect the discharge hose from the compressor.
  20. Cap off the discharge port of the compressor.
  21. Remove and discard the sealing washers.

  22. Object Number: 629122  Size: SH
  23. Remove compressor mounting bolts.
  24. Remove the compressor.
  25. If replacing the compressor, drain and measure as much of the PAG oil as possible from the removed compressor:
  26. 19.1. Drain the PAG oil from both the suction and discharge ports of the removed compressor into a clean container.

    Rotate the compressor crankshaft to assist draining the crankcase oil.

    19.2. Measure and record the amount of PAG oil drained from the removed compressor.

    This measurement will be used during installation of the replacement compressor.

Installation Procedure

    Important: The replacement compressors are pre-charged with PAG oil.

    Refer to Refrigerant System Capacities .


    Object Number: 629122  Size: SH
  1. Install the compressor.
  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 compressor mounting bolts.
  4. Tighten
    Tighten the bolts to 50 N·m (37 lb ft).


    Object Number: 628879  Size: SH
  5. Uncap the discharge port of the compressor.
  6. Using a lint-free clean, dry cloth, carefully clean the sealing surfaces of the A/C refrigerant lines and the A/C refrigerant component.
  7. Important: Flat washer type seals do not require lubrication.

  8. Install the sealing washer to the discharge hose.
  9. Connect the discharge hose to the compressor.
  10. Install the discharge hose nut.
  11. Tighten
    Tighten the nut to 16 N·m (12 lb ft).

  12. Install the sealing washer to the suction hose.
  13. Uncap the suction port of the compressor.
  14. Connect the suction hose to the compressor.
  15. Install the suction hose nut.
  16. Tighten
    Tighten the nut to 16 N·m (12 lb ft).


    Object Number: 629105  Size: SH
  17. Connect the electrical connector to the compressor.
  18. Connect the engine harness electrical connector.
  19. Install the air baffle.
  20. Install the air baffle bolts.
  21. Tighten
    Tighten the bolts to 20 N·m (15 lb ft).

  22. Release the belt tensioner and install the drive belt to the compressor pulley.
  23. Install the RH engine splash shield. Refer to Engine Splash Shield Replacement in Body Front End.
  24. Lower the vehicle.
  25. Evacuate and recharge the A/C system. Refer to Refrigerant Recovery and Recharging .
  26. Leak test the fittings of the component using J 39400-A .