SQUAWK/MOAN NOISE WHEN TCC IS APPLIED-INSTALL ISOLATION KIT

SUBJECT: SQUAWK/MOAN NOISE WHEN TCC APPLIES OR ON DECEL AT APPROXIMATELY 1900 RPM (INSTALL NEW TRANSAXLE COOLER BRACKETS)

MODELS AFFECTED: 1991-92 PARK AVENUE/ULTRA AND 1992 LESABRE MODELS

This bulletin is being revised for new parts and service procedures, and to update the models affected. Please discard Bulletin 91-74T60-14 and replace with this bulletin.

CONDITION:

--------- A squawk/moan noise is heard when the TCC applies or a moan noise is heard on decel at approximately 1900 rpm.

CAUSE:

----- This condition could be caused by a ground out of the transaxle cooler pipes at the cooler pipe clips where they attach to the lower tie bar.

CORRECTION:

---------- To correct this condition, it will be necessary to install isolation kit, part number 25614724. The isolation kit consists of two rubber grommets, two metal clips, and two screws.

SERVICE PROCEDURE:

(All Park Avenue/Ultra and LeSabre models except vehicles equipped with trailer towing Option V92)

1. Raise vehicle to gain access to cooler pipe clips attached to lower tie bar. (See illustration)

2. Unlatch both clips to release cooler pipes.

3. Remove clip attaching screws and clips.

4. Attach rubber grommets to cooler pipes in the same location as original clips.

5. Install metal clips over rubber grommets (see illustration).

6. Attach clips to tie bar with screws provided in the kit.

Torque to 3-4 N.m (4-5 lb.ft.).

7. Lower vehicle.

SERVICE PROCEDURE:

(Vehicles equipped with Trailer Towing Option V92)

1. Raise vehicle to gain access to cooler pipe clips attached to lower tie bar. (See illustration)

2. Unlatch the right side clip only to release cooler pipes.

3. Remove clip attaching screw and clip. (Right side clip only).

4. Attach rubber grommets to cooler pipes in the same location as original clip.

5. Install metal clip over rubber grommets. (See illustration)

6. Attach clip to tie bar with screw provided in the kit.

Torque to 3-4 N.m (4-5 lb. ft.).

7. Lower vehicle.

8. Discard remaining unused parts from the kit.

PARTS INFORMATION:

Parts are currently available from GMSPO.

WARRANTY INFORMATION:

Labor Operation No.: T5224

Labor Time: .3 hr.

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.