A/C - Noise/Vibration When Compressor is Engaged
90chevy31Number: 90-331-1B
Section: 1B
Date: August 1990
Corp. Bulletin No.: 031204
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.