For 1990-2009 cars

# RATTLE DUE TO LOOSE AIR PUMP TORQUE / PULLEY BOLTS

#### VEHICLES AFFECTED: All 1983 and 1984 Passenger Cars Equipped With A.I.R. Systems Except Corvette

A rattling noise from the engine compartment may be experienced due to loose A.I.R. pump pulley attaching bolts.

The following procedure must be used to correct the condition:

1. Remove the drive belt from the A.I.R. pump pulley.

2. Remove three (3) A.I.R. pump pulley attaching bolts and discard.

3. Inspect and remove any foreign material from the contact surfaces of the pulley and the pump.

4. Replace pulley if the holes have been elongated.

5. Reinstall the pulley using three (3) bolts, P/N 14063759. Use a torque wrench to torque all three (3) bolts to 14 N.m (124 in. lbs.).

6. Recheck the bolts to ensure they have not lost torque within ten minutes.

7. If specified torque cannot be reached, inspect pump threads for stripping and replace as necessary.

8. Reinstall and retension the belt.

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.