Coolant Temperature Sensor / Switch HVAC: Testing and Inspection

THERMAL BLOWER LOCKOUT SWITCH

The three failures associated with the thermal blower lockout switch are:
1. A short across the two terminals of the harness connector.
2. A vacuum leak.
3. Coolant leaks.

Refer to All Functions Selector Valve Positions Leak diagnosis for vacuum leaks. All Function Selector Valve Positions Leak