Preliminary Information

Radiator Fan Control Sensor Testing

WARNING: Removing the radiator fan control sensor while the engine is hot can cause the coolant to spray out, seriously scalding you. Always let the engine and radiator cool down before removing the radiator fan control sensor.

NOTE: Bleed air from the cooling system after installing the radiator fan control sensor.

1. Remove the radiator fan control sensor from the radiator.





2. Suspend the radiator fan control sensor in a container of water.
3. Heat the water, and check the temperature with a thermometer.

CAUTION: Do not let the thermometer touch the bottom of the hot container.





4. Measure the resistance between the A and B terminals according to the table.
5. If you don't get the readings, replace the radiator fan control sensor.

NOTE: Clean the sensor after testing.