For 1990-2009 cars

# A/C COMPRESSOR MOAN CHECK BELT TENSION/BRACKET

#### MODELS AFFECTED: 1982-1987 V6 ENGINES, LESS SINGLE DRIVE (SERPENTINE) BELT

Many A/C related noises and vibrations at idle and off idle can be corrected by proper tensioning of the air conditioning belt. If such a condition, with the A/C on, is reported, the belt tension should first be checked with an approved belt tension gage such as Kent-Moore J-23600 and tensioned per chart. When replacing the A/C belt or concluding a repair that requires removal or loosening of the A/C belt, care should be exercised to adjust belt back to proper tension.

Another cause of noise or vibration that should not be overlooked is compressor mounting bracket bolts. Make sure that bolts are to proper torque. Proper bolt torques also apply to single drive (serpentine) belt designs.

V6 A/C BELT TENSION CHART ---------------------------- Engine VIN Sales Engine A/C Belt Tensions Code Code Engine Max (New) Min (Used)* ------ ------ ------ --------- ----------- LE2 x 2.8L 650 N 300 N (150 lbs.) (70 lbs.,)

LK9 E 3.OL 750 N 400 N (165 lbs.) (90 lbs.)

LN3 3 3.8L MFI 750 N 400 N (165 lbs.) (90 lbs.)

LM9 9 3.8L SFI 650 N 35O N Turbo (150 lbs.) (80 lbs.)

LC4 4 4.1L 650 N 35O N (150 lbs.) (80 lbs.)

LD5 A 3.8L 65O N 350 N (150 lbs.) (80 lbs.)

*Spec. -0 +50 N

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.