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Home >> Chevrolet >> 1971 >> Chevelle Base, Not Available, 5.7L Eng, Not Available Trans >> Repair and Diagnosis >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> Automatic Temperature Control >> Description >> Other Control Units >> Auto Relay

Auto Relay

Mounted on evaporator housing directly above Lo Relay. Relay will be energized whenever the Engine Thermal Switch or A/C Override Switch is closed and the selector control head is in "Auto", "High", or "Defog" and is immediately energized in the "De-Ice" position. Closing of this relay supplies current to the blower resistor board in the programmer and allows blower motor to operate in any speed called for by the position of the system controls.

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