'DRUMMING' SOUND IN ROOF PANEL (REPAIR PROCEDURE) W/4 DOOR

Models Affected: 1989 BONNEVILLE 4-DOOR MODELS

In the event, a "drumming type" noise is heard in the roof panel area, it will be necessary to install sound deadener patches to the underside of the roof panel.

To correct this condition use the following repair procedure:

1. Remove headliner assembly as described in the 1989 Body Service Manual, Section 8-2.

2. Obtain sound deadener patch, part number 20742581 (305 x 305mm).

3. The repair involves splitting two of the patches and placing them between the number 1, 2, 3 and 4 roof bows. On the open area behind the number 3 bow, two of the full patches (20742581) should be used, See Figure 1.

4. Reinstall headliner assembly.

Parts are currently available from GMSPO.

Warranty Information:

Labor Operation Number: C3098 Labor Time : .5

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.