For 1990-2009 cars

# COOLANT LEAK AT ENGINE COOLANT HEATER ASSEMBLY

#### SUBJECT: COOLANT LEAK AT ENGINE COOLANT HEATER ASSEMBLY (CLEAN PLUG BORE, APPLY LUBRICANT, INSTALL NEW HEATER)

#### MODELS: 1995-96 CHEVROLET CAMARO 1995-96 PONTIAC FIREBIRD WITH 3800 SERIES II ENGINE (VIN K - RPO L36)

#### CONDITION:

SOME OWNERS MAY COMMENT ABOUT A COOLANT LEAK AND THE TECHNICIAN DETERMINES THE COOLANT LEAK ORIGINATES AT ENGINE COOLANT HEATER ASSEMBLY LOCATED ON THE RIGHT SIDE OF THE ENGINE.

#### CAUSE:

THE O-RING AROUND THE PERIMETER OF THE COOLANT HEATER MAY HAVE BEEN DAMAGED DURING INSTALLATION AT THE VEHICLE ASSEMBLY PLANT DUE TO INSUFFICIENT CLEANING OF THE PLUG BORE.

#### CORRECTION:

1. VERIFY THE COOLANT LEAK ORIGINATES AT THE COOLANT HEATER VIA VISUAL INSPECTION ON A HOIST. 2. DRAIN COOLANT FROM THE RADIATOR. 3. REMOVE COOLANT HEATER. 4. THOROUGHLY CLEAN THE PLUG BORE BY REMOVING ANY BURRS, SEALANT, COMPOUND, PAINT OR ROUGH SPOTS. 5. APPLY A COAT OF LUBRICANT, GM P/N 12377985 OR EQUIVALENT, TO THE O-RING AND MACHINED SURFACE OF THE BORE. 6. TUCK THE YOKE END OF THE HEATING COIL INTO THE INSIDE OF THE ENGINE BLOCK AND POSITION HEATER COIL SO THE ELECTRIC SOCKET FACES TOWARD THE FRONT OF THE ENGINE. 7. TORQUE BOLT TO 1.9 NM (17 LB. IN.). 8. REINSTALL COOLANT IN RADIATOR. 9. WARM ENGINE TO OPERATING TEMPERATURE AND VERIFY COOLANT LEAK HAS BEEN REPAIRED.

PARTS INFORMATION DESCRIPTION PART NUMBER ----------- ----------- HEATER ASSEMBLY - ENGINE COOLANT 24503486 CORD ASSEMBLY - ENGINE COOLANT HEATER 10246740 LUBRICANT - 14 OZ. CARTRIDGE 12377985 (GM SPEC 9985038)

PARTS ARE CURRENTLY AVAILABLE FROM GMSPO.

WARRANTY INFORMATION FOR VEHICLES REPAIRED UNDER WARRANTY, USE:

LABOR OPERATION DESCRIPTION LABOR TIME --------- ----------- ---------- R4600 HEATER, ENGINE BLOCK - REPLACE USE PUBLISHED LABOR 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.

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