FRONT COIL SPRING NOISE (INSTALL NEW P/N)

SUBJECT: FRONT COIL SPRING NOISE (INSTALL SLEEVE ON LOWER COILS/ INSTALL NEW DUST SHIELD)

VEHICLES AFFECTED: 1991-93 "C" AND 1992-93 "H" MODELS

APPLICATION:

----------- 1991-93 Buick Park Avenue 1991-93 Cadillac De Ville 1991-93 Oldsmobile Ninety-Eight 1992-93 Buick Le Sabre 1992-93 Oldsmobile Eighty-Eight 1992-93 Pontiac Bonneville

CONDITION:

--------- Two conditions may occur in the front strut assemblies that may cause noise to be transmitted to the passenger compartment.

A. Coil Contact Noise - This condition occurs when the two bottom coils of the springs contact each other as the vehicle is driven over bumps. This condition is often mistaken as a rattle in the dash and is most predominant on, but not limited to, the following spring codes: CHF, CHH, CHL, CHM, CHN, CHP.

B. Dust Shield Noise - This condition is a plastic to metal squeak or itching that occur's in cold weather over bumps.

CORRECTION: A ------------- 1. Verify that the noise is coil contact noise by spraying tracing powder on the lower two coils of the front springs.

2. Drive or jounce the vehicle and check for contact points between the coils.

3. Once coil contact has been identified, clean the spring, apply Kent Industries 10140 or 3M #76/77N or equivalent high tack adhesive to the lower two coils and install sleeve P/N 22077538 to cover the contact point.

CORRECTION: B ------------ A new dust tube (GM Part Number 22129001) has been released for service. Follow the service manual for installation instructions.

WARRANTY INFORMATION: (CONDITION A) -------------------- For vehicles repaired under warranty use:

Labour Time: .3 hr. (One or Both)

WARRANTY INFORMATION: (CONDITION B) -------------------- Dust Tube Installation - See Labor Time Guide

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.