GM Service Manual Online
For 1990-2009 cars only

Removal Procedure

Tools Required

J 38778 Door Trim Pad and Garnish Clip Remover

  1. Open and suitably support the hood.
  2. Use J 38778 in order to push on the retainers from the underside of the plenum chamber.

  3. Object Number: 315268  Size: SH
  4. Remove the plenum chamber insulator from the underside of the plenum chamber.

Installation Procedure


    Object Number: 315268  Size: SH
  1. Install the plenum chamber insulator to the underside of the plenum chamber.
  2. Push on the retainers to the underside of the plenum chamber insulator.
  3. Close the hood.