For 1990-2009 cars

# KNOCKING NOISE FROM THE ACCESSORY DRIVE BELT

#### SUBJECT: KNOCKING NOISE FROM THE ACCESSORY DRIVE BELT TENSIONER (REPLACE TENSIONER)

#### MODELS: 1994 BUICK CENTURY, REGAL AND SKYLARK 1994 CHEVROLET BERETTA AND CORSICA 1995 CHEVROLET LUMINA AND MONTE CARLO 1994 OLDSMOBILE ACHIEVA, CUTLASS CIERA AND CUTLASS SUPREME 1993 OLDSMOBILE CUTLASS SUPREME 1994 PONTIAC GRAND AM AND GRAND PRIX WITH 3100 ENGINE (VIN M - RPO L82)

#### CONDITION:

SOME VEHICLES MAY EXPERIENCE A KNOCKING NOISE FROM UNDER THE HOOD. THIS CONDITION IS MORE NOTICEABLE WITH THE AIR CONDITIONER ON.

#### CAUSE:

DURING PERIODS OF INCREASED TENSIONER ARM MOVEMENT, THE TENSIONER SPRING COILS CONTACT THE SPRING GUIDES INSIDE THE HOUSING CAUSING THE KNOCKING NOISE.

#### CORRECTION:

A NEW ACCESSORY DRIVE BELT TENSIONER, PART NUMBER 24504828, HAS BEEN DEVELOPED TO CORRECT THE NOISE ISSUES. REFER TO SECTION 6A5 OF THE APPROPRIATE VEHICLE SERVICE MANUAL FOR PROPER REMOVAL AND INSTALLATION PROCEDURES.

#### PARTS INFORMATION:

DESCRIPTION PART NUMBER ----------- ----------- ACCESSORY DRIVE BELT TENSIONER 24504828

PARTS ARE EXPECTED TO BE AVAILABLE FROM GMSPO OCTOBER 3, 1994.

#### WARRANTY INFORMATION:

FOR VEHICLES REPAIRED UNDER WARRANTY, USE: LABOR OPERATION: J0680 USE PUBLISHED LABOR OPERATION TIME.

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.

COPYRIGHT 1994. GENERAL MOTORS CORPORATION. ALL RIGHTS RESERVED.