ENGINE OVERHEATS; BCM CODE F9 COOLING FAN RUNNING BACKWARD

SUBJECT: ENGINE OVERHEATS: BCM CODE F9 (SWITCH POSITION OF WIRES AND RECONNECT)

VEHICLES AFFECTED: 1990 'C' DEVILLES AND FLEETWOODS

Some DeVilles and Fleetwoods produced prior to VIN 347520 may experience an engine overheating during slow speeds in high ambient temperatures or BCM code F49 due to the left (driver's side) cooling fan running backwards. The cooling fan should draw air from the grille through the radiator. Miswired fans will push air from the engine compartment out through the radiator.

The cause may be a miswired resistor harness for the left cooling fan. Refer to Figure 1.

To repair this condition obtain the proper terminal removal tool from J-38125 Terminal Repair Kit and perform the following procedure:

1. Disconnect the two-way connector at the left cooling fan motor. 2. Unseat the terminals in the two-way connector cavity A and B. 3. Reinstall the terminals in the two-way connector so that:

- the wire in cavity A is connected to the resistor block. - the wire in cavity B is connected to cavity C of the three-way harness connector.

The jumper should appear as in Figure 2 when completed. If the engine overheating condition or BCM codes still exist after correcting the cooling fan condition, refer to symptom diagnosis in Section 6B of the 1990 DeVille/Fleetwood Service Information Manual or to Section 8D as appropriate.

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.