what would cause the AC to be on when I only have the heat on?

Asked by Dec 08, 2014 at 05:24 PM about the 2005 Pontiac Grand Am SE

Question type: Maintenance & Repair

the button for the AC is off in the car, but the compressor kicks on under the hood.If AC is disconnected I get hotter air.

2 Answers

Do you have it on the defrost setting?

11,880

Like mwelk said, it will cycle when the defroster is on, but if it is cycling a lot then you may have low refrigerant. If so you may have a leak and should take it to a pro.

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