GM Service Manual Online
For 1990-2009 cars only

Tools Required

J 39400-A Halogen Leak Detector

Removal Procedure

  1. Raise the vehicle. Refer to Lifting and Jacking the Vehicle .

  2. Object Number: 872571  Size: SH
  3. Disconnect the electrical connector from the pressure sensor.

  4. Object Number: 872549  Size: SH
  5. Remove the pressure sensor from the compressor hose.
  6. Remove and discard the seal.

Installation Procedure


    Object Number: 872549  Size: SH
  1. Install a new seal in the pressure sensor.
  2. 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.

  3. Install the pressure sensor to the compressor hose.
  4. Tighten
    Tighten the pressure sensor to 5 N·m (44 lb in).


    Object Number: 872571  Size: SH
  5. Connect the pressure sensor electrical connector.
  6. Lower the vehicle.
  7. Leak test the fittings using the J 39400-A .