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: Cap or tape the open A/C hoses immediately to prevent system contamination.

  3. Remove the discharge hose to compressor nut.

  4. Object Number: 791658  Size: SH
  5. Disconnect the discharge hose from the compressor.
  6. Remove and discard the sealing washer.
  7. Cap or tape off the discharge hose.

  8. Object Number: 368807  Size: SH
  9. Release the drive belt tensioner.
  10. Remove the drive belt from the compressor pulley.

  11. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.

  12. Object Number: 125807  Size: SH
  13. Remove the air baffle bolts.
  14. Remove the air baffle.

  15. Object Number: 791142  Size: SH
  16. Disconnect the electrical connector from the compressor.
  17. Disconnect the engine harness electrical connector.
  18. Reposition the engine harness away from the compressor.


    Object Number: 791655  Size: SH
  19. Remove the suction hose to compressor nut.
  20. Disconnect the suction hose from the compressor.
  21. Remove and discard the sealing washer.
  22. Cap or tape off the suction hose.

  23. Object Number: 629122  Size: SH
  24. Remove compressor mounting bolts.
  25. Lower the vehicle.
  26. Remove the battery tray. Refer to Battery Tray Replacement in Engine Electrical.
  27. Remove the lower radiator hose. Refer to Radiator Outlet Hose Replacement in Engine Cooling.
  28. Disconnect the upper transmission oil cooler hose from the radiator. Refer to Automatic Transmission Oil Cooler Hose Replacement in Automatic Transaxle -- 4T65-E.
  29. Remove the compressor.
  30. If replacing the compressor, drain and measure as much of the PAG oil as possible from the removed compressor:
  31. 22.1. 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.

    22.2. 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 partially pre-charged with PAG oil.

    Refer to Refrigerant System Capacities .


    Object Number: 629122  Size: SH
  1. Install the compressor.
  2. Connect the upper transmission oil cooler hose to the radiator. Refer to Automatic Transmission Oil Cooler Hose Replacement in Automatic Transaxle -- 4T65-E.
  3. Install the lower radiator hose. Refer to Radiator Outlet Hose Replacement in Engine Cooling.
  4. Install the battery tray. Refer to Battery Tray Replacement in Engine Electrical.
  5. Raise the vehicle.
  6. 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.

  7. Install the compressor mounting bolts.
  8. Tighten
    Tighten the bolts to 50 N·m (37 lb ft).


    Object Number: 791655  Size: SH
  9. Remove cap or tape from the suction hose.
  10. Important: Using a lint-free clean, dry cloth, carefully clean the sealing surfaces of the A/C refrigerant hoses and the A/C refrigerant component.

    Flat washer type seals do not require lubrication.

  11. Install a new sealing washer to the suction hose.
  12. Connect the suction hose to the compressor.
  13. Install the suction hose to compressor nut.
  14. Tighten
    Tighten the nut to 16 N·m (12 lb ft).


    Object Number: 791142  Size: SH
  15. Connect the electrical connector to the compressor.
  16. Connect the engine harness electrical connector.
  17. Install the air baffle.

  18. Object Number: 125807  Size: SH
  19. Install the air baffle bolts.
  20. Tighten
    Tighten the bolts to 20 N·m (15 lb ft).

  21. Lower the vehicle.

  22. Object Number: 368807  Size: SH
  23. Release the drive belt tensioner.
  24. Install the drive belt on to the compressor pulley.


    Object Number: 791658  Size: SH
  25. Remove cap or tape from the discharge hose.
  26. Install a new sealing washer to the discharge hose.
  27. Connect the discharge hose to the compressor.
  28. Install the discharge hose to compressor nut.
  29. Tighten
    Tighten the nut to 16 N·m (12 lb ft).

  30. Evacuate and recharge the A/C system. Refer to Refrigerant Recovery and Recharging .
  31. Leak test the fittings of the component using J 39400-A .