A/C - Noise or Vibration When Compressor Engaged

90chevy23
GMC NUMBER: 90-1B-97

GROUP: 1B Air Conditioning
DATE: September, 1990

CORPORATE
NUMBER: 031204
SUBJECT: AIR CONDITIONING NOISE/VIBRATION - INSTALL A/C COMPRESSOR ADJUSTING BRACKET

MODELS: 1989-90 G2 AND G3 WITH 6.2L DIESEL ENGINES
CONDITION Some 1989-90 G2 an G3 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 the air conditioning 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 through, GMSPO.

WARRANTY INFORMATION

Labor Operation: T7061

Labor Time: .8 hr.

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