Windnoise
Glass Panel PositionProper glass panel position is low in the front and high in the rear. The panel should be adjusted to 1-1.5 mm low in front, 1-1.5 mm high at the center, rear. Proper panel adjustment has been found to eliminate most windnoise comments.
If adjustment is necessary, use:
Labor Operation Labor Time
B2720 0.5 hr
Glass Weatherstrip
If proper glass panel adjustment does not eliminate the windnoise at the sunroof glass, continue with the following:
1. Check seal-to-roof gap by sliding a thin card (business cards work well) along each edge of the glass panel between the sealing surfaces. Some friction should be present, although the card should slide rather easily. If no gaps are noted, Investigate sources of windnoise other than the sunroof. Look for other known causes or bulletins which may apply.
2. If a small gap is noted along the front of the glass panel, adjust the panel forward as far as possible. Recheck the gap to be sure a proper seal is maintained at the rear.
3. If the vehicle is equipped with a full vinyl roof, inspect to be sure the vinyl top retainer ring is assembled properly. If the trim ring appears to be assembled properly (straight; does not appear wavy), go to Step 4.
If inconsistent gaps were noted in Step 1 and the retainer ring appears to be wavy, the vinyl top may not be trimmed correctly. Remove the retainer and trim the vinyl away from all rivet areas to allow the retainer ring to lay flat. If a vinyl top seam runs into the opening, ensure that the seam area is trimmed away to provide a flat mounting area for the retainer ring. Refer to Figure 1.
4. With sunroof usage over time, a gap may develop along the back of the glass panel between the seal and housing or trim ring due to crushing of the seal. Crushing of the front edge, combined with the tendency of the seal material to take a set, allows the glass panel to travel further forward in the opening resulting in the rear gap. If this is the case, seal replacement is required. Follow the weatherstrip replacement procedure specified in the Service Information Manual noting the special procedures below for assembly and adjustment of the glass panel after seal replacement.
Glass panel seal part numbers are as follows:
Without Full Vinyl: P/N 12536412 - has internal reinforcement
With Full Vinyl: P/N 12393333
P/N 12536412 has an internal reinforcement which must be centered at the front of the glass panel. This seal was implemented into production on 1990 vehicles in September on Eldorados and Sevilles, and November on DeVilles and Fleetwoods. P/N 12393333 is a smaller seal and does not have a reinforcement due to the opening restrictions resulting from the vinyl top and trim ring. P/N 12536412 cannot be used on a vehicle with a vinyl top.
Note:
The seal internal reinforcement should be centered at the front of the glass panel.
Parts are currently available from GMSPO. For warranty purposes use:
Labor Operation Labor Time
C1440 (Weather Seal Replacement) 0.8 hr
New Weatherstrip Special Installation Procedure
With a new seal, the panel may initially stick when moving from the closed position up into vent or down to slide to the rear. To ensure correct height adjustments use the following procedure:
1. For easier access to the glass panel mounting screws, start the screws with the panel in the vented position. Do not tighten any of the screws with the panel vented. This can cause the panel to be too far forward in the opening.
2. Close the panel. Adjust the glass panel position as described in the Service Information Manual and tighten the glass panel mounting screws.
3. Operate sunroof to fully back, open position. Bring to closed position holding switch until motor stalls.
4. Tap roof panel at rear to allow glass to find natural setting. Readjust as necessary.
5. Allow the new seal to set overnight with the glass positioned as described above. If the panel continues to hang up at the rear, slide the shaft of a screwdriver (or similar tool) along the rear of the seal. This should allow continued proper operation.