Engine Cooling Fan: Operation

The electric cooling fan operates only when ignition switch is in the "RUN" position.

If vehicle is equipped with A/C, the cooling fan is controlled by a cooling fan controller and fan relay. The cooling fan motor is energized when the A/C cycling pressure switch closes with the select lever in "A/C" or "DEFROST" position. The A/C clutch coil will be energized once voltage is available at the fan motor. The A/C clutch will cycle with A/C clutch cycling pressure switch.

The cooling fan motor will stay energized as A/C clutch cycles if cycling pressure switch opening intervals are less than 2-3 minutes in duration. If coolant temperature switch closes in A/C mode at 210°F (99°C) on Escort, fan motor will run continuously until coolant temperature drops below 193°F (89°C).

Two different fan controllers are used. Proper operation of the cooling system cannot be obtained unless proper fan controller is used. Each controller is identified with a color code and part number. The cooling fan operates when engine coolant temperature goes above 210°F (99°C) or when A/C is operated. When A/C low side pressure is low, the clutch cycling pressure switch signals A/C fan controller to cut off power to A/C clutch field coil, fan motor and throttle solenoid kicker.

The cooling fan controller is mounted on right cowl panel under instrument panel. The controller can be serviced through glove compartment opening.