GM Service Manual Online
For 1990-2009 cars only

Removal Procedure

  1. Remove the rear bumper fascia. Refer to Rear Bumper Fascia Replacement .

  2. Object Number: 392595  Size: SH
  3. Remove or pull back the driver-side rear carpet (cargo area) to expose pressure relief valve.
  4. Important: Do not pry pressure relief valve (1) from outside the vehicle as it may damage the mounting surface. Only remove valve from inside the vehicle.

  5. Remove the pressure relief valve (1) by depressing retaining tabs on valve housing.

Installation Procedure


    Object Number: 392595  Size: SH
  1. Install the pressure relief valve (1) into body cavity (2).
  2. Important: Ensure that the pressure relief valve (1) is fully seated allowing the housing tabs to expand behind sheet metal. Verify secure engagement by pulling lightly on valve to ensure it is secured.

  3. Reinstall or reconfigure the driver-side rear carpet (cargo area) to original location.
  4. Install the rear bumper fascia. Refer to Rear Bumper Fascia Replacement .