FLUTTERING CONDITION REAR HOOD EDGE

Subject: HOOD FLUTTER

Model and Year: 1989-91 S/T TRUCKS

The rear hood edge of some 1989-1991 S/T vehicle may exhibit a fluttering condition. A field repair has been tested and has proven effective in correcting this condition. This is done by means of hood bumpers (hood stops) which exert a pressure to the underside of the hood. This eliminates the freedom of motion that the hood is experiencing.

SERVICE PROCEDURE:

To repair this condition do the following:

1. Obtain two hood bumpers part # 458306.

2. Measure 8 1/2 inches along lower cowl panel from the inboard side of the front fenders as shown in Figure 1 dimension "A".

3. Place bumper so that the middle of the bumper lines up with the inboard measurement.

4. Remove the old contact adhesive by sliding the hood stop against a smooth surface. Using 400 grit sand paper very lightly scuff the surface areas to be glued for maximum adhesion.

NOTE: If the placing of the hood stops under the hood causes the hood to rise to more than 1/8 of an inch above the cowl panel then, remove some of the rubber from the top of the bumper using a razor blade or sharp knife and continue until an acceptable height is achieved.

5. Use wheatherstrip adhesive 12345097 to glue bumpers to vehicle.

PARTS INFORMATION

Part Number Description # per vehicle ------------ ------------ --------------- 458306 Bumper 1 for each side 12345097 Weatherstrip Adhesive

Part are currently available through GMSPO.

WARRANTY INFORMATION

For vehicles repaired under warranty use:

Labor Operation: T7600

Labor Time: 0.2 hr.

Trouble Code: 92

NOTE: Labor Operation is coded to base vehicle coverage in the warranty system.

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.