GM Service Manual Online
For 1990-2009 cars only

Removal Procedure


    Object Number: 227996  Size: SH
  1. Raise the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
  2. Remove the right rear wheel. Refer to Tire and Wheel Removal and Installation in Tires and Wheels.
  3. Remove the right rear fascia extension. Refer to Rear Bumper Fascia Extension Replacement in Bumpers.
  4. Important: Before disconnecting the air hose from the intake air filter or the air compressor, clean the components and the surrounding area to prevent dirt and other foreign material from entering the ELC system.

  5. Disconnect the air tube from the air dryer.
  6. Remove the bolt and the harness tie with the air tube from the air compressor bracket.

  7. Object Number: 227988  Size: SH
  8. Remove the intake air filter from the vehicle.
  9. Remove the vehicle harness connector from the air compressor connector.
  10. Remove the two nuts, the bolt, and the air compressor assembly from the vehicle.

  11. Object Number: 227993  Size: SH
  12. Slide the air compressor connector off of the connector anchor.
  13. Remove two bolts and the heat shield from the air compressor bracket.

  14. Object Number: 227997  Size: SH
  15. Remove three bolts and the air compressor assembly from the bracket.
  16. Remove the air dryer from the air compressor. Refer to Automatic Level Control Air Dryer Replacement .

  17. Object Number: 226931  Size: SH
  18. Remove the air hose from the air compressor at two places.

  19. Object Number: 227985  Size: SH
  20. Remove the two screws and the two brackets from the air compressor.

Installation Procedure

    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.


    Object Number: 227985  Size: SH
  1. Install the two brackets on the air compressor with two screws.
  2. Tighten
    Tighten two screws to 7 N·m (62 lb in).


    Object Number: 226931  Size: SH
  3. Connect the air hose to the air compressor at two places.
  4. Install the air dryer on the air compressor. Refer to Automatic Level Control Air Dryer Replacement .

  5. Object Number: 227997  Size: SH
  6. Install the air compressor assembly onto the bracket with three bolts.
  7. Tighten
    Tighten three bolts to 3 N·m (26 lb in).


    Object Number: 227993  Size: SH

    Important: Do not install the third heat shield bolt. It must be installed after the air tube is connected.

  8. Install the heat shield on the air compressor bracket with two bolts.
  9. Tighten
    Tighten the two bolts to 4 N·m (35 lb in).

  10. Install the air compressor connector to the connector anchor.

  11. Object Number: 227988  Size: SH
  12. Install the air compressor assembly on the vehicle with two nuts and a bolt.
  13. Tighten

        • Tighten the bolt to 9 N·m (80 lb in).
        • Tighten the two nuts to 9 N·m (80 lb in).
  14. Connect the harness connector to the air compressor connector.
  15. Install the intake air filter on the vehicle.

  16. Object Number: 227996  Size: SH
  17. Connect the air tube to the air dryer.
  18. Connect the air tube and the harness tie to the air compressor bracket with the bolt.
  19. Tighten
    Tighten the bolt to 4 N·m (35 lb in).

  20. Install the right rear fascia extension. Refer to Rear Bumper Fascia Extension Replacement in Bumpers.
  21. Install the right rear wheel. Refer to Tire and Wheel Removal and Installation in Tires and Wheels.
  22. Important: Before driving the vehicle, turn the ignition on and wait approximately 45 seconds. This will ensure that the air adjustable shock absorbers are filled with residual pressure.

  23. Lower the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.