F 250 4WD Pickup V8-7.3L DSL Turbo VIN K (1994)
Fan Clutch: Description and Operation
Variable Speed Fan With Coiled Bi-Metallic Thermostatic Spring
PURPOSE
The fan clutch causes fan speed to increase with a rise in temperature and to decrease as temperature decreases.
OPERATION
The fan drive clutch is a fluid coupling containing silicone oil. Fan speed is regulated by the torque-carrying capacity of the silicone oil. The more
silicone oil in the coupling, the greater the fan speed, and the less silicone oil, the slower the fan speed.
The fan drive clutch used is the coiled bi-metallic thermostatic spring type. The fan drive clutch uses a heat-sensitive, coiled bi-metallic spring connected
to an opening plate, to control fan speed based on cooling need.
