Radiator Cooling Fan Temperature Sensor / Switch: Testing and Inspection

WARNING: Removing the radiator fan switch 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 switch.









NOTE: Bleed air from the cooling system after installing the radiator fen switch.

1. Remove radiator fan switch from the thermostat cover.





2. Suspend the radiator fan switch in a container of water as shown.
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 continuity between the A and B terminals according to the table.