GM Service Manual Online
For 1990-2009 cars only

Ensure that the glass panel weatherstrip seal has contact with the metal roof panel around the entire periphery of the seal when the sliding glass panel is in the closed position. Ensure that the weatherstrip is not crushed at either of the following locations:

    • The front of the panel
    • The rear of the panel

Inspect for contact of the seal with the metal roof panel around the periphery of the seal. Insert one of the following components between the seal and the metal roof panel:

    • A business card
    • A .0006 mm (0.015 in) feeler gage

Drag the card or gage around the entire seal contact area.

Ensure that the business card or the feeler gage is making continuous contact between the seal and the metal roof panel around the entire seal contact area. If the gap is excessive at the front or rear of the panel, adjust the sliding glass panel in the fore/aft position.


    Object Number: 745008  Size: SH
  1. Fully open the sliding glass panel.
  2. Working from the top of the vehicle, note the position of the track assembly on the fore/aft adjustment scale (2).
  3. Loosen the track cover rail fasteners (1) on both sides of the sunroof module.

  4. Object Number: 745008  Size: SH
  5. For fore/aft adjustment, loosen the fasteners (1,4,5).
  6. Slide the track cover rail (3) on both sides forward or rearward as needed 1 or 2 notches on the adjustment scale (2).
  7. Tighten the fasteners.

    Ensure that the following items are positioned evenly fore/aft:

    • The left tracks
    • The right tracks
  8. Close the sliding glass panel.
  9. Inspect the seal position again using a business card or feeler gage.
  10. Repeat the adjustment procedure as needed in order to achieve the correct seal contact.
  11. Ensure that all of the fasteners are tight after the adjustment procedure.