Wagoneer L6-258 4.2L VIN C 2-bbl (1982)
Fan Clutch: Description and Operation
Fig. 1 Fan drive clutch assembly, 1984-87. 1980-83 similar
Fig. 2 Variable speed fan with coiled bi-metallic thermostatic spring
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 uses a heat sensitive, coiled bi-metallic spring connected to an opening plate which brings about similar results. This causes the fan
speed to increase with a rise in temperature and to decrease as temperature decreases.
Most engines equipped with a serpentine drive belt have a reverse rotating water pump and fan drive assembly. These components are
identified by the word REVERSE stamped on the cover and inner side of the fan drive assembly, and a REV cast into the water pump body.
When replacing the above mentioned parts, do not install components that are intended for non-serpentine drive belt usage.
