GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Pontiac 🢒 1998 🢒 Grand Prix 🢒 Body and Accessories 🢒 Body Rear End 🢒 Pressure Relief Valve Replacement

Removal Procedure
  1. Open rear compartment.
  2. Remove the rear bumper fascia. Refer to Rear Bumper Fascia Replacement in Bumpers.
  3. Pull back the rear compartment trim panel. Refer to Rear Compartment Trim Panel Replacement .

    4. Object Number: 318859 Size: SH
  4. Use a small flat-bladed tool in order to release the snaps on the pressure relief valve at the two upper and two lower locations.
  5. Remove the pressure relief valve from the lower quarter panel.

Installation Procedure

    Object Number: 318859 Size: SH
  1. Install the pressure relief valve to the lower quarter panel.
  2. Press the pressure relief valve into the lower quarter panel until the snaps lock into place at both upper and lower locations.
  3. Unfold the rear compartment trim panel. Refer to Rear Compartment Trim Panel Replacement .
  4. Install the rear bumper fascia. Refer to Rear Bumper Fascia in Bumpers.
  5. Close the rear compartment.