MOAN OR NOISE W/ A/C ON INSTALL BRACES AS OUTLINED

Model and Year: 1985-88 B, G, F CARS WITH 4.3L, 5.0L, 5.7L (VIN CODES F, G, H, Z, 6) WITH C60 A/C

TO: ALL CHEVROLET DEALERS

This bulletin cancels and supersedes Dealer Service Bulletin 87-34 dated December, 1986, (Section 1B) and 87-72 dated February, 1987, (Section 1B). All copies of the above listed bulletins should be discarded. This bulletin expands model/year applications.

Some 1985-88 B/G and 1985-87 F cars equipped with V-8 (VIN F, G, H, or 6) or V-6 (VIN Z) engines (without serpentine accessory drive) may exhibit a moan or engine vibration when the air conditioning compressor is engaged. This condition may be corrected by the installation of a support brace to the A/c compressor mounting bracket. Refer to the illustration for installation procedure.

The following components will be required:

PART NAME PART NUMBER NUMBER REQUIRED --------- ------------ ---------------- Support Brace 10055819 1 Stud (3/8-16) 14057002 1 Bolt (3/8-16) 9440169 1 Nut (3/8-16) 14057004 1

IMPORTANT: THE STUD SHOULD BE COATED WITH THREAD SEALANT, P/N 1052080, PRIOR TO INSTALLATION.

Parts are currently available from GMSPO.

Labor Operation Number: T1188 Labor Time: .4 Hours

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.