GM Service Manual Online
For 1990-2009 cars only

Adjustment of the Sunroof Glass Panel Seal

The sunroof glass panel seal controls the entry of water to the drain channels. If the sunroof glass panel is correctly adjusted, the fit between the weatherstrip and the roof will be snug.

Complete the following steps in order to test the fit:

  1. Insert a piece of paper between the roof and the weatherstrip.
  2. Close the glass panel.
  3. Pull out the paper.
  4. If there is some resistance when you pull out the paper, the fit is correct. Proper adjustment is necessary to ensure that the amount of water to the sunroof drain hoses is not excessive. An improper fit may cause water leaks or objectionable wind noise.

  5. Complete all of the glass panel to roof adjustments by changing the vertical height and centering of the glass panel.

Sunroof Glass Panel Height Adjustment


    Object Number: 470705  Size: SH
  1. Slide the sunroof sunshade to the open position.
  2. Position the sunroof glass panel to the fully closed position.
  3. Loosen the four sunroof glass panel adjusting screws 2 screws on each side. The screws must remain tight enough to have the sunroof glass panel retain its adjusted position.

  4. Object Number: 294274  Size: MH
  5. Individually adjust the 4 corners of the glass panel.
  6. Adjust the front of the sunroof glass panel. Ensure that the sunroof glass front (3) is 0.787 mm (0.031 in) below the top surface of the roof panel. Also, the glass seal (1) is centered.
  7. Adjust the rear of the sunroof glass panel. Ensure that the rear of the sunroof glass (2) is 0.787 mm (0.031 in) above the top surface of the roof panel.
  8. Verify the adjustment of the sunroof glass panel seal.

  9. Object Number: 470705  Size: SH

    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.

  10. Tighten the sunroof glass panel screws.
  11. Tighten
    Tighten the screws to 4 N·m (35 lb in).