TAPPING NOISE IN CORNER OF DASH

Model and Year: 1987-89 S/T TRUCKS

TO: ALL CHEVROLET DEALERS

Some 1987-89 S/T Trucks may experience a noise from the cowl area located around either of the front dash speakers. The noise has been described as a tapping or creaking noise similar to tapping a pencil lead on the windshield.

This condition occurs primarily at ambient temperatures below 45 degrees Fahrenheit. Therefore, vehicles which sit inside a heated facility during repair should be "cold soaked" prior to verifying the repair.

Repair Procedure

Apply repair procedure exactly as described in Chevrolet Bulletin 86-58 (Section 10) dated April, 1986, which has been reproduced in this bulletin for your convenience.

IMPORTANT: Windshield replacement will not resolve the situation.

For repairs to vehicles under warranty, use:

Labor Op: T7230

1983-86 Models - Labor Time: .6 Hr per side

1987-89 Models - Labor Time: .8 Hr.per side

NOTE: On 87-89 vehicles, the location of the one inch hole will encompass a small weld. Additional time has been added to the labor operation to take this into account. Be sure to cut through only the first layer of sheet metal as specified in Step 9 on the bulletin.

IMPORTANT: Dealers who have vehicles that are not repaired by this procedure should contact Technical Assistance for further assistance.

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.