COOLING FANS BURNED OUT RELAY FAN OPERATION EXPLAINED

1987 FIREBIRD MODELS WITH 5.OL V8 (VIN CODE F) AND 5.7L V8 (VIN CODE 8) ENGINES AND C-60 OR C-67 AIR CONDITIONING

It has been reported that some dealers are trying to rewire the two engine cooling fans so that both fans run at the same time. This SHOULD NOT be done as it may result in a burned out fan relay and no fan operation.

Normal operation of the two fans is as follows:

1. The left hand fan (drivers position) is controlled by the ECM.

Under 35 MPH:

Fan on with A/C operation and/or coolant over 226 degrees Fahrenheit.

Over 35 MPH:

Fan on with coolant over 226 degrees Fahrenheit.

2. The right hand fan is controlled by a coolant temperature switch located between the number 6 and 8 cylinders. This fan comes on at 238 degrees Fahrenheit coolant temperature.

No attempt should be made to alter the designed fan operation.

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.