DESCRIPTION
The auxiliary cooling fan provides additional cooling at low speed vehicle operations, extended idle, stop and go conditions, and when running the air conditioner system.
OPERATION
The auxiliary cooling fan circuit consists of a coolant temperature sensor, a relay and the auxiliary fan. When the coolant sensor reaches a predetermined temperature, it closes the circuit to the relay coil, which energizes the relay, passing 12-volts to the auxiliary fan. When the coolant temperature decreases below the setpoint of the sensor, the circuit to the relay opens and 12-volt power to the auxiliary fan stops. The cooling fan only operates when the cooling fan is on, and the coolant temperature sensor is above the set temperature.