Coolant Temperature Sensor / Switch HVAC: Testing and Inspection

INSPECT ECT SWITCH
a. Using an ohmmeter, check that no continuity exists between the terminals when the coolant temperature is above 100° C (212° F).
If continuity exists, replace the switch.
b. Using an ohmmeter, check that continuity exists between the terminals when the coolant temperature is below 91° C (196° F).
If there no continuity exists, replace the switch.