ITCH NOISE WINDSHIELD PILLAR (DIAGNOSE/INSTALL FELT TAPE)

SUBJECT: ITCH NOISE FROM WINDSHIELD PILLAR AREA (DIAGNOSE/INSTALL FELT TAPE)

MODELS: 1986-92 S1/T1 UTILITY TRUCKS

Some 1986-92 S/T utility trucks may exhibit a plastic to metal or plastic to plastic "itch" noise from the left or right windshield pillar area.

This noise may be caused by the instrument panel pad rubbing against the cowl or dash support panel.

An adhesive backed felt tape has been released to insulate the dash pad outer corners from the dash support panel. This tape may also be used on the non-visible surfaces of other trim panels as necessary to eliminate itch noises.

The felt tape, P/N 12541499, is released in a 10 ft. x 30 mm x 1 mm roll to provide the technician sufficient material to insulate numerous trim panels.

SERVICE PROCEDURE

Prior to installing the felt tape, it should be determined if the IP pad to dash support panel is the area that is generating the noise. Refer to the Squeak and Rattle Diagnosis and Correction Manual to identify other possible sources such as ECM Mounting Bracket or Air Vent. If it is determined the IP pad is the source of the noise:

1. Remove the instrument panel radio speaker(s) to obtain better access to the metal ledge on which the instrument panel pad rests.

2. Remove the 4 IP upper retaining screws located in the defroster duct openings and pull the pad back slightly.

NOTICE: Do not remove the dash pad any further than necessary to perform the repair. The possibility exists that additional noises may be generated due to the wiring and HVAC ducts being mispositioned upon reinstallation.

3. Cut a strip of felt tape 6 inches long, remove the protective backing and apply the tape to the top of the metal ledges in front of the speaker openings where the instrument panel pad rests.

NOTICE: Installation is easier if 2 screw drivers are wedged between instrument panel pad and the cowl panel to raise the IP pad.

4. Push the IP pad forward and reinstall the retaining screws and speakers.

SERVICE PARTS INFORMATION

Part Number Description Qty. ----------- ----------- ---- 12541499 Felt Tape 1

Parts are currently available from GMSPO.

WARRANTY INFORMATION

For vehicles repaired under warranty use:

Labor Labor Operation Description Time --------- ----------- ----- Install felt tape on .4 hr T7551 IP pad support

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.