New Yorker L6-225 3.7L VIN E 1-bbl (1982)
Fan Clutch: Description and Operation
Fig. 1 Fan drive clutch (typical of Chrysler rear wheel drive vehicles)
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.
Chrysler rear wheel drive vehicles use a bi-metal coil spring type of fan drive clutch. The bi-metal coil on the face of the fan clutch senses the
temperature of the air after it passes through the radiator. Until the thermostat is open, the fan will "Idle" at a reduced speed. Once the thermostat is open
and the incoming air is heated (to a specified temperature), thereby causing a reaction in the bi-metal coil, will the fan clutch engage and drive the fan for
required engine cooling. When the fan clutch is engaged, the fan speed will increase with the engine speed until a specified fan speed is reached. At this
point the fan will rotate at the maximum speed despite any increase in engine RPM.
