For 1990-2009 cars

# ENGINES WITH A/C OVERHEAT INSTALL FAN MODULE KIT

1985-86 FIREBIRD MODELS WITH A/C

"PLEASE DISCARD BULLETIN 86-6(GASOLINE)-62. ADDITIONAL INFORMATION ON ENGINE APPLICATION HAS BEEN ADDED"

SOME OWNERS OF 1985-86 FIREBIRD MODELS EQUIPPED WITH A 5.OL V-8 ENGINES LISTED ABOVE AND AIR CONDITIONING, ARE RETURNING TO DEALERS BECAUSE OF AN ENGINE OVERHEATING CONDITION.

THIS CONDITION MAY BE CAUSED BY A LOSS OF ENGINE COOLANT AND/OR OWNER AGGRESSIVE DRIVING HABITS AND OCCURS MORE FREQUENTLY IN SITUATIONS WHERE THE TERRAIN IS HILLY AND AMBIENT TEMPERATURES REACH APPROX- IMATELY 100 DEGREES FAHRENHEIT.

TO INCREASE AIR FLOW AND PROVIDE ADDITIONAL ENGINE COOLING, A FAN MODULE KIT AND BRACE RODS ARE AVAILABLE FROM WDDGM. ALSO REQUIRED, BUT ORDERED SEPARATELY, IS A 120 AMP GENERATOR.

THE FOLLOWING PROCEDURE IS RECOMMENDED WHEN CORRECTING RELATED ENGINE OVERHEATING PROBLEMS.

#### PROCEDURE:

1. DETERMINE IF ENGINE HAS BLOWN HEAD GASKETS DUE TO SEVERE OVERHEATOR BOIL OVER. REPLACE GASKETS AS REQUIRED.

2. CHECK FOR THE PRESENCE OF ANY POSSIBLE DAMAGE TO THE RADIATOR AIR DEFLECTOR EXTENSION AND RADIATOR AIR SIDE-BAFFLES (IF So EQUIPPED).

3. CHECK EXISTING ELECTRIC COOLING FAN FOR PROPER DIRECTION OF ROTATION AND CORRECT TEMPERATURE GAGE/SENSOR OPERATION.

4. CHECK ENGINE COOLANT. ADD OR REPLACE AS NECESSARY. REPLACEMENT COOLANT MUST BE A 50/50 MIX CONCENTRATE OF GOOD QUALITY GLYCOL AND WATER TO ACHIEVE THE DESIGN INTENT COOLANT BOIL TEMPERATURE.

5. THERMAL CYCLE

A. DRIVE VEHICLE FOR AT LEAST 10 MILES WITHOUT BOIL OVER. B. ALLOW VEHICLE TO COOL DOWN OVERNIGHT. C. CHECK COOLANT AT RECOVERY BOTTLE AND AT RADIATOR FILLER NECK. ADD COOLANT IN BOTH PLACES AS NECESSARY.

6. REPEAT CYCLE UNTIL NO ADDITIONAL COOLANT IS REQUIRED.

7. IF ENGINE OVERHEATING STILL EXISTS, INSTALL THE PARTS LISTED BELOW FOLLOWING INSTRUCTIONS INCLUDED IN THE FAN MODULE KIT.

PART NAME PART NUMBER --------- ----------- FAN MODULE KIT 14101636 BRACE ROD 14044877 (2 REQUIRED) GENERATOR 1101258

#### WARRANTY INFORMATION

LABOR OPERATION: T1181 LABOR TIME: 3.7 HOURS

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.