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HOMESERVICE MANUALSGMC1999FORWARD CONTROL 5.7 R, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 396 (ELECTRONIC SUSPENSION SYSTEM - AUTOMATIC LEVEL CONTROL)REPAIR INSTRUCTIONSAIR TUBE REPLACEMENTINSTALLATION PROCEDURE
1999 GMC Forward Control 5.7 R, Automatic

Installation Procedure

1999 GMC Forward Control 5.7 R, AutomaticSECTION Installation Procedure
WARNING: This page is about a different car, the 2002 Oldsmobile Aurora. However, it is still accessible from the selected car via links, so may be relevant.
  1. Connect the air tube to the air dryer.
  2. Install the air tube with the harness tie and the bolt on the air compressor bracket.
    Fig 1: Installing Harness Tie & Bolt
    G01582146Courtesy of GENERAL MOTORS CORP.
  3. Install the air tube on the vehicle with 3 clips.
  4. Connect the air tube to the left and right rear shock absorbers.
  5. Install 2 metal clips on the air tube and the vehicle. Place each clip immediately forward of the wheel house fold-over tabs on the LH and RH side of the vehicle.
  6. Install both rear wheels. Refer to TIRE AND WHEEL REMOVAL AND INSTALLATION .
    Fig 2: Connecting Air Tube To Rear Shock Absorbers
    G01582147Courtesy of GENERAL MOTORS CORP.

    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.

  7. Lower the vehicle.
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.