For 1990-2009 cars

# COOLANT LEAK NEAR BELT TENSIONER ASSEMBLY

#### SUBJECT: COOLANT LEAK NEAR BELT TENSIONER ASSEMBLY (REPLACE O-RINGS ON HEATER COOLANT BYPASS INLET PIPE ASSEMBLY)

#### MODELS: 1995 BUICK PARK AVENUE, RIVIERA 1995 OLDSMOBILE EIGHTY EIGHT, NINETY EIGHT 1995 PONTIAC BONNEVILLE WITH 3800 SERIES II ENGINE (VIN K - RPO L36)

VEHICLES BUILT BEGINNING NOVEMBER 11, 1994 THROUGH NOVEMBER 16, 1994.

#### CONDITION:

SOME OWNERS MAY COMMENT ABOUT AN ENGINE COOLANT LEAK WHICH MAY BE TRACEABLE TO THE VICINITY OF THE BELT TENSIONER ASSEMBLY AND NEAR THE LOWER INTAKE MANIFOLD.

#### CAUSE:

ON SOME ENGINES, THE LOWER INTAKE MANIFOLD MAY HAVE AN OVERSIZE HOLE WHERE THE HEATER COOLANT BYPASS INLET PIPE ATTACHES. REFER TO THE ILLUSTRATION. AN OVERSIZE HOLE MAY NOT PROVIDE SUFFICIENT O-RING COMPRESSION AND RESULT IN A COOLANT LEAK AT THIS JOINT.

#### CORRECTION:

REPLACE THE PRODUCTION O-RING ON THE HEATER COOLANT BYPASS INLET PIPE WITH AN OVERSIZE SERVICE O-RING THAT WILL COMPENSATE FOR THE LARGER HOLE. THE HEATER COOLANT BYPASS INLET PIPE HAS TWO O-RINGS. THE PRODUCTION O-RINGS WILL APPEAR ORANGE/BLACK IN COLOR AFTER BEING IN SERVICE, HOWEVER, THEY WILL APPEAR AS A SOLID ORANGE COLOR WHEN NEW. THE SERVICE O-RING IS PURPLE IN COLOR. REMOVE BOTH PRODUCTION ORANGE/BLACK O-RINGS FROM THE INLET PIPE. INSTALL A SERVICE PURPLE O-RING ON THE END OF THE PIPE THAT ATTACHES TO THE LOWER INTAKE MANIFOLD. INSTALL A NEW PRODUCTION ORANGE O-RING ON THE OPPOSITE END OF THE PIPE. REFER TO THE ILLUSTRATION.

****** INSERT ILLUSTRATION HERE. *******

#### SERVICE PROCEDURE:

REMOVE OR DISCONNECT

1. ACCESSORY DRIVE BELT TENSIONER BRACKET. REFER TO SECTION 6A8-13. 2. HEATER COOLANT BYPASS INLET PIPE ASSEMBLY FROM TENSIONER BRACKET. 3. TWO O-RINGS FROM PIPE ASSEMBLY. DISCARD OLD O-RINGS.

INSTALL OR CONNECT

1. DIP NEW O-RINGS IN CLEAN ENGINE COOLANT TO AID IN INSTALLATION. 2. NEW SERVICE PURPLE O-RING TO END OF PIPE THAT ATTACHES TO THE LOWER INTAKE MANIFOLD. 3. NEW PRODUCTION ORANGE O-RING TO END OF PIPE THAT ATTACHES TO TENSIONER BRACKET. 4. HEATER COOLANT BYPASS INLET PIPE ASSEMBLY TO TENSIONER BRACKET. 5. ACCESSORY DRIVE BELT TENSIONER BRACKET. REFER TO SECTION 6A8-13.

#### PARTS INFORMATION:

DESCRIPTION COLOR PART NUMBER

SERVICE SEAL PURPLE 24505540 PRODUCTION SEAL ORANGE/BLACK 25537068

PARTS ARE CURRENTLY AVAILABLE FROM GMSPO.

#### WARRANTY INFORMATION:

LABOR OPERATION DESCRIPTION LABOR TIME

J0680 R+R TENSIONER USE PUBLISHED LABOR SURPENTINE BELT TIME

FIGURES: 1 ATTACHMENTS: 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 1995. GENERAL MOTORS CORPORATION. ALL RIGHTS RESERVED.