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Home >> Saab >> 1981 >> 900 S, 2D Hatchback, Automatic Trans >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Thermostatic Air Cleaner >> Operation >> Turbo Models

Turbo Models

Incoming air below 23° F (-5° C) causes the air door to be open only from the exhaust manifold air pipe. The thermostat mixes the fresh and heated air up to 41° F (5° C), when the fresh air duct is fully open.