VISTA VENT WATER LEAKS REPAIR PROCEDURES

VEHICLES AFFECTED: 1984-86 Pontiac Fiero With AD3

Water leaks on 1984 to 1986 Fiero vista vents can be repaired by adding drainage holes to the plastic roof outer panel and replacing hardware nuts at the hinge and latch locations on the glass panel.

The drainage holes are to be drilled through the Plastic Roof Outer Panel Only in all four (4) corners of the weatherstrip mounting area. Figure 1 shows the location of the holes with the weatherstrip removed for illustrative purposes.

The recommended procedure for adding holes to the roof outer panel is as follows:

1. Remove the vista vent glass assembly and place on a clean work surface.

2. During the drilling operation hold the weatherstrip out of the way to prevent damage. Using an electric drill motor and 3/16 inch drill bit, drill one hole (through the plastic roof outer panel only) in each corner of the weatherstrip cavity as shown in Figure 1, view A.

3. Reinstall the vista vent glass assembly and water test to insure an acceptable repair.

4. After water testing, remove the vista vent glass assembly and dry the roof inner panel by blowing compressed air through the holes in the roof outer panel. Apply a small amount of GM P/N 992883 airless rust inhibitor (or equivalent) through the holes in the roof outer panel to protect the metal roof inner panel from corrosion.

If water leaks are noted at the hinge and latch locations, replace nut and bushing with new nut P/N 20664430 having an integral seal and not requiring bushings (Figure 2).

Due to the lower profile and improved appearance, the new nut should be used in all locations (hinges and latches) when service operations on vista vents are performed.

When resealing or replacing weatherstrips use 3M 80119 weatherstrip adhesive (black) or equivalent. The shaded areas shown in Figure 3 (view A and section A-A) show the correct locations and sealing patterns to be used.

General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information.