For 1990-2009 cars

# MOAN OR VIB. WITH A/C ON (INSTALL SUPPORT BRACE)

#### Models Affected:19855-88 FIREBIRD, 1985-86 BONNEVILLE AND PARISIENNE, 1985-87 GRAND PRIX AND 1985 SAFARI WAGON MODELS EQUIPPED WITH LB4, LG4, L69,LB9, L98 AND LM1 ENGINES (VIN CODES H, G, F, Z AND 6)

This bulletin supersedes bulletin 87-1-3A dated 2187 which should be discarded due to added model applications.

Some 1985-88 Firebird, 1985-86 Bonneville and Parisienne, 1985-87 Grand Prix and 1985 Safari Wagon models 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.

WARRANTY INFORMATION

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.