Radiator Cooling Fan Motor: Description and Operation

FAN CONTROL

Crown Victoria/Grand Marquis, Town Car: FCV Duty Cycle Output From PCM (Negative Duty Cycle):

LS6/LS8, Thunderbird: FCV Duty Cycle Output From PCM:

The PCM monitors certain parameters (such as engine coolant temperature, vehicle speed, A/C on/off status, A/C pressure, etc) to determine engine cooling fan needs.

For Variable Speed Electric Fan(s):
The PCM controls the fan speed and operation using a duty cycle output on the Fan Control Variable (FCV) circuit. The fan controller (located at or integral to the engine cooling fan assembly) receives the FCV command and operates the cooling fan at the speed requested (by varying the power applied to the fan motor).

For Relay Controlled Fans:
The PCM controls the fan operation through the Fan Control (FC) (single speed fan applications), Low Fan Control (LFC), Medium Fan Control (MFC) and/or High Fan Control (HFC) outputs.

2.0L Focus (with A/C) And Taurus/Sable: PCM FC Output State For Cooling Fan Speeds Chart:

2.0L Escape: PCM FC Output State For Cooling Fan Speeds Chart:

Freestar, Monterey: PCM FC Output State For Cooling Fan Speeds Chart:

For three speed fans, although the PCM output circuits are called low, medium and high fan control (FC), cooling fan speed is controlled by a combination of these outputs. Refer to the table.