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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 48 (Air Suspension) >> Repair Instructions >> Compressor Assembly Automatic Level Control Air Replacement (Dual Compressors) >> Installation Procedure

Installation Procedure

WARNING: This page is about a different car, the 2007 Hummer H2. However, it is still accessible from the selected car via links, so may be relevant.
    Fig 1: Rear Compressor Mounting Bolts
    GM1455978Courtesy of GENERAL MOTORS CORP.
    IMPORTANT: Check the air supply lines for deep scores or cuts. If the air supply lines are damaged the lines must be replaced.
  1. Install the compressor assembly to the vehicle.
  2. Install the air lines.
    NOTE: Refer to Fastener Notice .
  3. Install the rear air spring compressor mounting bolts (1).

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

    4. Fig 2: Ground Strap & Bolt
    GM1455980Courtesy of GENERAL MOTORS CORP.
  4. Install the front air spring compressor mounting bolt (3).

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

  5. Install the ground strap (3) to the frame.
  6. Install the ground strap bolt (1).

    Tighten:  Tighten bolt to 6 N.m (53 lb in).

    7. Fig 3: Rear Compressor Mounting Bolts
    GM1455978Courtesy of GENERAL MOTORS CORP.
  7. Connect the air spring compressor and air inflator switch electrical connectors (1, 2).
  8. Install the CPA retainer (3).
  9. Remove the support from the compressor.
    IMPORTANT: If the rear axle was allowed to hang unsupported, lower the vehicle far enough to allow the air spring to be manually engaged to the support on the axle tube with minimal distortion of the air spring bladder. Ensure that the air spring is fully engaged to the axle support.
  10. Pressurize the air springs. Refer to Air Suspension Pressurization .
  11. Lower the vehicle.
  12. Start the vehicle and run for approximately 2 minutes to ensure that the air spring leveling system is functioning properly.
  13. Verify the D height. Refer to Trim Height Specifications .
  14. Re-calibrate the trim height. Refer to Suspension Position Calibration .
  15. Check for leaks. If a leak is found at the air supply line connections replace the air supply lines. Refer to Air Suspension Air Line Replacement .
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