buick Workshop Repair Guides

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Air Conditioning Switch: Description and Operation

This signal tells the ECM that the A/C selector switch is turned "ON," and that the A/C pressure switch is closed. The ECM uses this to adjust the idle
speed before turning "ON" the A/C clutch. If the signal is not available to the ECM, the A/C compressor will be inoperative. 

Heating and Air Conditioning > Air Conditioning Switch > Component Information > Description and Operation

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