Coolant Temperature Sensor / Switch HVAC: Testing and Inspection

INSPECT SWITCH CONTINUITY
a. Using an ohmmeter, check that no continuity exists between the terminals when the coolant temperature is above 90°C (194°F).
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.