ROOF NOISES ON S/T 4 DOOR APPLY SEALER ALONG ROOF BOWS

SUBJECT: ROOF "PINGING" NOISE/"BOOM" (OIL CAN) NOISES (APPLY SEALER ALONG #1 AND #2 ROOF BOWS)

VEHICLES AFFECTED: 1991 S/T 4-DOOR UTILITY VEHICLES

Some owners of the above subject vehicles may experience "boom" or "pinging" noises from the roof area. These conditions can occur from insufficient amounts of roof bow sealer in the bow channels. Lack of sealer can create roof panel "oil canning" against the #1 and/or #2 roof bows. The "pinging" condition can occur if the outer roof panel contacts either or both ends of the #1 roof bow.

To correct, it is necessary to install additional sealer in the roof bow channels and at the outboard end of each roof bow.

SERVICE PROCEDURE: Refer to Figures 1-3 ---------------------------------------

1. Disconnect negative battery cable.

2. Remove sunshades.

3. Remove grab handles.

4. Remove coat hooks.

5. Remove shoulder belt "D" rings attached to "B" and "C" pillars, as shown in Figure 1.

6. Remove "B" pillar trim from both sides of the vehicle refer to Figure 1.

7. Remove dome light cover and housing.

8. Remove upper rear window glass trim and disconnect rear dome/ cargo light.

9. Remove upper three rear quarter glass trim fasteners on each side of vehicle to loosen top of rear quarter glass trim.

NOTE: Removal of entire upper rear quarter glass trim is not necessary.

10. If vehicle is equipped with inside spare tire, remove tire.

11. Lower front of headliner below rear view mirror and slide headliner forward as far as possible. Carefully work the rear of the headliner as far left as possible to clear right side of headliner from rear quarter glass trim and remove headliner.

12. To eliminate roof "boom" visually inspect area between top of #1 and #2 roof bows and the outer roof panel for any areas sealer expansion did not occur or areas sealer was missed refer to Figure 2, Views "A" and "B".

13. Gently push upward on the roof panel to separate it away from the roof bow and apply G.M.S. Type B sealer, GM P/N 1052917, or equivalent, in any open areas along the length of the roof bows found during the visual inspection, as shown in Figure 2, View A. If proper sealer expansion and sealer installation was found it is not necessary to apply sealer, continue to next step.

NOTE: Care should be taken not to deform the roof panel.

14. To eliminate "pinging" condition, gently push upward on the roof panel over the #1 roof bow (Figure 1). Apply G.M.S. Sealer Type "B", GM P/N 1052917, or equivalent, to outboard ends (approximately 6" length) filling entire width of bow surface to insulate roof bow from roof panel (Figure 2, Views A and B and Figure 3).

15. Reinstall headliner.

16. Refasten upper three rear quarter glass trim fasteners.

17. Reconnect rear dome/cargo light and reinstall rear window upper trim.

18. Reinstall dome light housing and cover.

19. Reinstall coat hooks.

20. Reinstall "B" pillar trim.

21. Reinstall shoulder belt "D" rings to "B" and "C" pillars.

22. Reinstall grab handles.

23. Reinstall sunshades.

24. Reinstall spare tire, if equipped.

25. Reconnect negative battery cable.

SERVICE PARTS INFORMATION:

Part Number Description ----------- ----------- 1052917 G.M.S. Sealer Type "B"

Use the most applicable Labour Operation and Time from the Canadian Labour Time Guide.

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.