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Home >> Chevrolet >> 1977 >> Vega Base, 2D Hatchback, Automatic Trans >> Repair and Diagnosis >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> Automatic Temperature Control >> Components & Functions >> Outside Air Diaphragm

Outside Air Diaphragm

When there is no vacuum applied to this diaphragm, the air door is positioned to admit all outside air. When vacuum is applied, a mixture of inside air and outside air enters the system.

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