Radiator Cooling Fan Temperature Sensor / Switch: Testing and Inspection

INSPECTION
1. DRAIN ENGINE COOLANT
2. REMOVE ECT SWITCHES





3. INSPECT NO. 1 ECT SWITCH
a. Using an ohmmeter, check that there is no continuity between the switch terminals when the coolant temperature is above 98°C (208°F).
If there is continuity, replace the switch.
b. Using an ohmmeter, check that there is continuity between the switch terminals when the coolant temperature is below 88°C (190°F).
If there is no continuity, replace the switch.





4. INSPECT NO. 2 ECT SWITCH
a. Using an ohmmeter, check that there is continuity between the switch terminals when the coolant temperature is above 94°C (201°F).
b. Using an ohmmeter, check that there is no continuity between the switch terminals when the coolant temperature is below 83°C (181°F).
If continuity is not as specified, replace the switch.
5. REINSTALL ECT SWITCHES
6. REFILL WITH ENGINE COOLANT