GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Buick 🢒 1999 🢒 Century (China) (CNG) 🢒 Engine 🢒 Engine Electrical 🢒 Air Conditioning Compressor Replacement

Removal Procedure
  1. Disconnect the battery negative cable. Refer to Battery Negative Cable Disconnection and Connection in Engine Electrical.
  2. Remove the air cleaner and duct assembly. Refer to Air Cleaner Assembly Replacement in Engine Controls - 3.0L.
  3. Recover the refrigerant. Refer to Refrigerant Recovery and Recharging .
  4. Remove the accessory drive belt. Refer to Drive Belt Replacement in Engine Mechanical - 3.0L.
  5. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
  6. Remove the lower air deflector. Refer to Radiator Air Baffle Assemblies and Deflectors in Engine Cooling.
  7. Remove the right side engine splash shield. Refer to Engine Splash Shield Replacement in Body Front End.
  8. Disconnect the electrical connector from the compressor.

    9. Object Number: 277924 Size: SH
  9. Remove the bolt and the compressor hose assembly at the compressor.

    10. Object Number: 277918 Size: SH
  10. Remove the lower mounting bolt.
  11. Remove the two upper mounting bolts.
  12. Remove the compressor.

Installation Procedure
  1. Install the compressor.

    2. Object Number: 277918 Size: SH

    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.

  2. Install the two upper mounting bolts.

    3. Tighten
    Tighten the compressor upper bolts to 50 N·m (37 lb ft).

  3. Install the lower mounting bolt.

    4. Tighten
    Tighten the compressor lower bolt to 50 N·m (37 lb ft).

    Important: Lubricate the new sealing washers with mineral base 525 viscosity refrigerant oil.

    Install the new sealing washers onto the compressor hose assembly.


    Object Number: 277924 Size: SH
  4. Install the compressor hose assembly and bolt to the compressor.

    5. Tighten
    Tighten the compressor hose bolt to 33 N·m (24 lb ft).

  5. Connect the electrical connector to the compressor.
  6. Install the right side engine splash shield. Refer to Engine Splash Shield Replacement in Body Front End.
  7. Install the lower air deflector. Refer to Radiator Air Baffle Assemblies and Deflectors in Engine Cooling.
  8. Lower the vehicle.
  9. Install the accessory drive belt. Refer to Drive Belt Replacement in Engine Mechanical - 3.0L.
  10. Evacuate and charge the system. Refer to Refrigerant Recovery and Recharging .
  11. Inspect the system for leaks. Refer to Leak Testing .
  12. Install the air cleaner and duct assembly. Refer to Air Cleaner Assembly Replacement in Engine Controls - 3.0L.
  13. Connect the battery negative cable. Refer to Battery Negative Cable Disconnection and Connection in Engine Electrical.