GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Cadillac 🢒 2008 🢒 Escalade EXT 🢒 Diagnostic Navigation 🢒 Vehicle Diagnostic Information 🢒 Air Conditioning Compressor Replacement

Air Conditioning Compressor Replacement LY2,LY5, LH6, L76, L92 and LMG

Special Tools

J 39400-A Halogen Leak Detector

Removal Procedure

    Object Number: 370869 Size: SH
  1. Recover the refrigerant. Refer to Refrigerant Recovery and Recharging .
  2. Install a ratchet into the air conditioning (A/C) belt tensioner adapter opening.
  3. Remove the air cleaner resonator outlet duct. Refer to Air Cleaner Resonator Outlet Duct Replacement .
  4. Rotate the A/C belt tensioner clockwise in order to relieve the tension on the belt.
  5. Remove the A/C belt from the A/C compressor.
  6. Slowly release the tension on the A/C belt tensioner.
  7. Remove the discharge hose bolt from the A/C compressor.
  8. Remove the discharge hose from the A/C compressor.
  9. Remove the suction hose bolt from the A/C compressor.
  10. Remove the suction hose from the A/C compressor.
  11. Discard the sealing washers. Cap all of the openings.
  12. Disconnect the electrical connections.

    13. Object Number: 648141 Size: SH
  13. Remove the A/C compressor mounting bolts. The lower right bolt (3) will stay with the compressor due to a lack of clearance.
  14. Remove the A/C compressor (2) from the bracket (1).
  15. If replacing the A/C compressor. Refer to Air Conditioning Compressor Oil Balancing .

Installation Procedure

    Object Number: 648141 Size: SH
  1. Install the A/C compressor (2) to the bracket (1) through the fender well. Insert the mounting bolt (3) into the lower right mounting boss before installing the A/C compressor.
  2. Install the A/C compressor to the bracket. Insert the mounting bolt into the lower right mount before installing the A/C compressor.

    3. 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 A/C compressor mounting bolts.

    4. Tighten
    Tighten the bolts to 50 N·m (37 lb ft).

  4. Connect the electrical connector to the A/C compressor.
  5. Install the A/C discharge hose to the compressor using new sealing washers. Refer to Sealing Washer Replacement .
  6. Install the A/C discharge hose bolt to the A/C compressor.

    7. Tighten
    Tighten the bolt to 16 N·m (12 lb ft).

  7. Install the A/C suction hose to the compressor using new sealing washers. Refer to Sealing Washer Replacement .
  8. Install the A/C suction hose bolt to the A/C compressor.

    9. Tighten
    Tighten the bolt to 16 N·m (12 lb ft).

  9. Install the A/C drive belt. Refer to Air Conditioning Compressor Belt Replacement .
  10. Evacuate and recharge the A/C system. Refer to Refrigerant Recovery and Recharging .
  11. Install the air cleaner resonator outlet duct. Refer to Air Cleaner Resonator Outlet Duct Replacement .
  12. Leak test the fittings of the component using the J 39400-A .

Air Conditioning Compressor Replacement HP2


Object Number: 1972539 Size: MF

Callout

Component Name

Danger: Always perform the High Voltage Disabling procedure prior to servicing any High Voltage component or connection. Personal Protection Equipment (PPE) and proper procedures must be followed.

The High Voltage Disabling procedure will perform the following tasks:

   • Identify how to disable high voltage.
   • Identify how to test for the presence of high voltage.
   • Identify condition under which high voltage is always present and personal protection equipment (PPE) and proper procedures must be followed.
Failure to follow the procedures exactly as written may result in serious injury or death.

Preliminary Procedures

  1. Disable hybrid high voltage system. Refer to High Voltage Disabling and High Voltage Enabling.
  2. Recover the refrigerant. Refer to Refrigerant Recovery and Recharging.
  3. Remove the air cleaner. Refer to Air Cleaner Assembly Replacement.
  4. Remove the air cleaner resonator outlet duct. Refer to Air Cleaner Resonator Outlet Duct Replacement.
  5. Remove the suction hose. Refer to Suction Hose Replacement
  6. Remove the discharge hose. Refer to Discharge Hose Replacement
  7. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle.
  8. Remove the engine shield. Refer to Engine Shield Replacement.
  9. Remove the oil pan skid plate. Refer to Oil Pan Skid Plate Replacement.

1

A/C Compressor Cable Bolt (Qty: 2)

Caution: High Voltage (HV) cables should never be removed from the mounting block. Removal of the individual HV cable from the mounting block may result in HV cable and/or component damage from improper:

   • Cable sealing
   • Electrical shielding
   • Terminal position assurance

Notice: Refer to Fastener Notice in the Preface section.

Tighten
9 N·m (80 lb in)

2

A/C Compressor Cable Mounting Bolt (Qty: 2)

Tighten
9 N·m (80 lb in)

3

A/C Compressor Cable

4

A/C Compressor Seal

Procedure

Remove and discard the seal.

5

A/C Compressor Bolt (Qty: 3)

Tighten
50 N·m (37 lb ft)

6

A/C Compressor

Procedure

  1. Disconnect three wire low voltage electrical connector from compressor.
  2. Insert bottom compressor bolts into compressor before installing compressor to vehicle.
  3. Reprogram A/C compressor. Refer to Air Conditioning Compressor Control Module Programming and Setup