E 250 V10-6.8L VIN S (2005)
Radiator Cooling Fan Motor: Description and Operation
FAN CONTROL
Five Hundred/Freestyle/Montego, Crown Victoria/Grand Marquis, Town Car: FCV Duty Cycle Output From PCM (negative Duty Cycle)
LS, 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) 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. Some applications will have the xFC circuit wired to 2 separate relays.
