Interior - Wheel Bearing Like Road Noise
90cadillac11Bulletin No. T-91-9
File in Group 10
Number 190
Corp. Ref. No. 011612
Date Sept. 1990
SUBJECT: ROAD NOISE IN PASSENGER COMPARTMENT
MODELS AFFECTED: 1989-1990 DE VILLE AND FLEETWOOD COUPES
Some 1989-1990 DeVille and Fleetwood Coupes may experience road noise emitting from the rear seat or rear sail panel areas on coarse road surfaces (i.e., worn or stud-damaged concrete). This sounds very similar to wheel bearing noise. Follow the procedure below before replacing a hub and bearing assembly.
To repair this condition install dampening package, P/N 25600885, on top of the left and right rear strut towers (inside the rear compartment area) using the following procedure:
1. Remove speaker enclosures from rear shelf.
IMPORTANT: Additional trim removal is not necessary.
2. Grind the ends of the rear seat shoulder harness retractor bolts flush where they protrude down from the rear shelf.
3. Position left and right dampener weights on top of the rear shock towers. (Dampeners are marked LH for left and RH for right.) Install one stud extender on the rearmost strut mount stud on each side on top of the existing nut bypassing it through the hole in the dampener weight and running it down by hand. Then, lift the weight up so the stud flats are exposed and torque to 12-15 N-m (9-11 lbs.ft.) with an open-end wrench.
4. Install washers and M-14 nuts and torque to 20 N-m (15 lbs.ft.). Reinstall speaker enclosures.
Parts are currently available from GMSPO.
For warranty purposes use Labor Operation T6380 at .3 hour.