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Home >> Mercury >> 1989 >> Tracer 2D Hatchback, Standard >> Repair and Diagnosis (Single Page) >> Engine Performance >> Theory and Operation >> Theory/Operation - 4-CYL >> Computerized Engine Controls >> Input Devices (Fuel Injection) >> A/C Switch

A/C Switch

Informs ECA when A/C system is operating. ECA advances idle speed to prevent poor idling and increased emissions.

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