gmc Workshop Repair Guides

GMC Workshop Manuals

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Air Conditioning Switch: Description and Operation

The air conditioning "On" signal informs the ECM the A/C selector switch is turned on, and the A/C pressure cycling switch is closed. Using this
information, the ECM adjusts the engine idle speed as necessary to ensure a smooth idle.

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

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