ROAD NOISE IN REAR SEAT AREA (INSTALL DAMPENING PACKAGE). Cadillac DeVille 1990

REVISION: 08/12/94

THIS BULLETIN IS BEING REVISED TO INCLUDE THE 1992 AND 1993 MODEL YEARS.

PREVIOUS DIVISIONAL PUBLICATION NUMBERS WERE: CADILLAC T-91-9 GM OF CANADA 91-2-240 *******************************************************************

SUBJECT: ROAD NOISE IN REAR PASSENGER COMPARTMENT (INSTALL DAMPENING PACKAGE)

MODELS: 1985-93 CADILLAC DEVILLE AND FLEETWOOD

SOME OWNERS MAY COMMENT ON 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 BY PASSING 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 THE MAIN SPEAKER ENCLOSURES.

PARTS ARE CURRENTLY AVAILABLE FROM GMSPO.

WARRANTY INFORMATION:

FOR VEHICLES REPAIRED UNDER WARRANTY, USE:

LABOR OPERATION NUMBER: E5758 (RH) E5759 (LH) LABOR TIME: .3 HR. (EACH)

FIGURES: 0

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.