Coolant Temperature Sensor / Switch HVAC: Testing and Inspection

INSPECT ECT SWITCH CONTINUITY
a. Using an ohmmeter, check that no continuity exists between the terminals when the coolant temperature is above 93 °C (199 °F).
If continuity exists, replace the switch.
b. Using an ohmmeter, check that continuity exists between the terminals when the coolant temperature is below 83 °C (181 °F).
If no continuity exists, replace the switch.