Radiator Cooling Fan Relay

An electric radiator cooling fan is used on Cherokee and Comanche models with the 4.0L engine and A/C or heavy duty cooling. Normal operation of the radiator cooling fan is controlled by the engine controller through the coolant sensor input. Cooling fan will also operate whenever A/C compressor clutch is activated, regardless of temperature.

When engine coolant temperature reaches 217°F (103°C), engine controller supplies radiator cooling fan relay with a ground path which closes the radiator cooling fan relay contacts and allows battery voltage from the ignition switch to reach radiator cooling fan motor.