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Home › Saab › 1991 › 900 Base, 2D Convertible, Automatic › Repair and Diagnosis (Single Page) › Engine Performance › Theory and Operation › Engine Controls - Theory & Operation › Computerized Engine Controls › Input Devices › A/C Switch

A/C Switch

When A/C switch is on, it sends a signal to the fuel injection ECU. The ECU sends a signal to the Automatic Idle Control (AIC) valve to increase idle speed to compensate for increased load.