GM Service Manual Online
For 1990-2009 cars only

Auxiliary Air Compressor Replacement 4500/5500

Removal Procedure

  1. Remove the auxiliary air tank. Refer to Auxiliary Air Tank Replacement .

  2. Object Number: 807275  Size: SH
  3. Disconnect the auxiliary air compressor electrical harness.

  4. Object Number: 817634  Size: SH
  5. Disconnect the auxiliary air compressor feed line at the reservoir.

  6. Object Number: 807279  Size: SH
  7. Remove the auxiliary air compressor mounting nuts and remove the auxiliary air compressor assembly from the frame rail and the stud plate.

Installation Procedure

    Notice: Refer to Fastener Notice in the Preface section.


    Object Number: 807279  Size: SH
  1. Install the auxiliary air compressor assembly to the frame rail and the stud plate with nuts.
  2. Tighten
    Tighten the nuts to 55 N·m (41 lb ft).


    Object Number: 817634  Size: SH
  3. Connect the auxiliary air compressor feed line to the reservoir.

  4. Object Number: 807275  Size: SH
  5. Connect the auxiliary air compressor electrical harness.
  6. Install auxiliary air tank. Refer to Auxiliary Air Tank Replacement .

Auxiliary Air Compressor Replacement 6500/7500/8500

Removal Procedure

  1. Remove the left side fuel tank. Refer to Fuel Tank Replacement .

  2. Object Number: 807275  Size: SH
  3. Disconnect the auxiliary air compressor electrical harness.

  4. Object Number: 817634  Size: SH
  5. Disconnect the auxiliary air compressor feed line at the reservoir.

  6. Object Number: 807279  Size: SH
  7. Remove the auxiliary air compressor mounting nuts and remove the auxiliary air compressor assembly from the frame rail and the stud plate.

Installation Procedure

    Notice: Refer to Fastener Notice in the Preface section.


    Object Number: 807279  Size: SH
  1. Install the auxiliary air compressor assembly to the frame rail and the stud plate with nuts.
  2. Tighten
    Tighten the nuts to 55 N·m (41 lb ft).


    Object Number: 817634  Size: SH
  3. Connect the auxiliary air compressor feed line to the reservoir.

  4. Object Number: 807275  Size: SH
  5. Connect the auxiliary air compressor electrical harness.
  6. Install the left side fuel tank. Refer to Fuel Tank Replacement .