R4 A/C COMPRESSOR MOAN/NOISE/ VIBRATION BULLETIN CANCEL

SUBJECT: R4 A/C COMPRESSOR MOAN/VIBRATION/NOISE BULLETIN CANCELLATION

VEHICLES AFFECTED: 1987-89 "C/K, R/V, P" TRUCKS AND "M/L, G" VANS WITH SERPENTINE BELTS

THIS BULLETIN SUPERSEDES AND REPLACES CORPORATE BULLETIN REFERENCE NUMBER 961205R**. THIS BULLETIN IS BEING REVISED TO CANCEL SERVICE INFORMATION WHICH IS NO LONGER APPLICABLE.

All R4 compressors currently available are built to the latest design specifications, therefore, at the start of production for 1992 models the special orange and black label referred to in Corporate Bulletin # 961205R** is no longer used for either production or service parts.

When investigating an A/C Moan/Vibration/Noise condition on a 1987-89 light duty truck, refer to the appropriate bulletin listed below:

GM CANADA CHEV GMC CORPORATE MODELS NUMBER NUMBER NUMBER NUMBER ------ --------- ------ ------ --------- 88-1-120 88-413-1B 88-T-209 861203R 1985-88 All Light Duty Without Serpentine Belt Drive

89-1-104 89-07-1B 89-T-02 831211R 1987-89 M-Vans With 4.3L Engines

93-1-134 90-331-1B 90-1B-97 031204R 1989-90 G2 and G3 W/6.2L Diesels

90-1-138 90-363-1B 90-1B-103 061205R 1987-90 S/T Trucks W/2.8L Engines

91-1-108 91-505-1B 91-1B-188 061201R 1988-91 C/K

93-1B-108 92-274-1A 92-1B-121 821202R 1987-92 S/T Trucks W/2.8L Engines

92-1-127 92-276-1B 92-1B-123 261203 1988-92 C/K Trucks

** BULLETIN REFERENCES: ---------------------- Corporate Ref. 961205R

General Motors of Canada 89-1-145 Chevrolet Division 89-280-1B GMC Truck Division 89-1B-118

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.