Engine Cooling Fan: Operation

CAUTION: Disconnect cooling fan prior to performing any underhood service. Fan can operate with ignition on and engine off.

The electric cooling fan operates only when ignition switch is in the "RUN" position on Tempo and Topaz models. Cooling fan operates whenever cooling fan temperature switch is closed on Escort.

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

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

Two different cooling fan controllers are used. Proper fan controller must be used to obtain proper operation of the cooling system. Fan controller is identified with a color code and part number.

Cooling fan operates when engine coolant temperature exceeds 210°F (99°C) or when A/C is operated. When A/C low side pressure is low, the clutch cycling pressure switch signals the fan controller to cut off power to A/C clutch coil, cooling fan motor and throttle solenoid kicker.

Cooling fan controller on Escort is located under right side of instrument panel, in front of evaporator mounting bracket. On Tempo and Topaz, controller is mounted on right cowl panel under instrument panel and can be serviced through glove compartment opening.