Radiator Cooling Fan Temperature Sensor / Switch: Testing and Inspection

INSPECTION
1. DRAIN ENGINE COOLANT





2. REMOVE ECT SWITCH
a. Disconnect the connector.
b. Remove the ECT switch.
c. Remove the O-ring from the ECT switch.





3. INSPECT ECT SWITCH
a. Using an ohmmeter, check that there is no continuity between the terminals when the coolant temperature is above 93°C (199°F).
If there is continuity, replace the switch.
b. Using an ohmmeter, check that there is continuity between the terminals when the coolant temperature is below 83°C (181°F).
If there is no continuity, replace the switch.
4. REINSTALL ECT SWITCH
a. Install a new O-ring to the ECT switch.
b. Install the ECT switch.
c. Connect the connector.
5. REFILL WITH ENGINE COOLANT
6. START ENGINE AND CHECK FOR COOLANT LEAKS