F 550 4WD Super Duty V8-6.0L DSL Turbo VIN P (2003)
Fan Clutch: Description and Operation
Vistronic Drive Fan (VDF)
The cooling fan electronic clutch is controlled by the PCM. The PCM monitors Engine Oil Temperature (EOT) and Engine Coolant Temperature
(ECT) and sends a duty cycle command to the fan clutch to achieve adequate cooling. When a circuit fault is detected the PCM will set a DTC.
