Decoding Your Car’s AC, Button by Button

A/C Button

The AC button may also act as the AC system power button, usually activating the entire climate control/AC system. It turns on the AC compressor, which cools a car’s interior by circulating refrigerant through the AC system. When the AC compressor is operating, it removes moisture from the air. This helps clear a foggy windshield (even if the temperature is set to maximum heat) while lowering cabin temperature quicker on hot summer days.

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