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Home >> Chevrolet >> 1977 >> Vega Base, 2D Hatchback, Automatic Trans >> Repair and Diagnosis (Single Page) >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> Automatic Temperature Control >> Components & Functions >> Control >> In-Car Turn-On Switch

In-Car Turn-On Switch

A thermostatic switch enclosed in a small plastic cylinder located just behind the faceplate. It senses car interior temperature and will close and turn on the system if that temperature is above approximately 75°F (24°C). This will occur even if the engine coolant is cold and the other turn-on switch located in the right cylinder head, is cold. This provides immediate cooling in a hot car that has not been run for some time.

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