A/C NOISE/VIBRATION (INSTALL A/C COMPRESSOR ADJ. BRACKET)

Subject: AIR CONDITIONING NOISE/VIBRATION

Model and Year: 1989-90 G TRUCK WITH 6.2L DIESEL (VIN CODE C, J) ENGINE

TO: ALL CHEVROLET DEALERS

Condition:

----------- Some 1989-90 G-vans with the 6.2L diesel may exhibit a noise/vibration when the air conditioning compressor is engaged. This noise/vibration normally occurs between 50 to 65 MPH.

Cause:

------ This noise/vibration is the result of a resonance set up in the accessory drive system with air conditioning and compressor engaged.

Correction:

----------- A new A/C compressor front adjusting bracket, P/N 10163738 which replaces the existing bracket, has been released to correct this condition.

Parts are currently available from GMSPO.

Use Applicable Labor Operation and Time.

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.