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Contribution d'origine par : Sara Conner ,

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@SherryBarksdale - I had the same problem in my 1999 Grand Am Se and a full overnight computer diagnostic showed the only issue was the A/C was running nonstop even when all the knobs were off, even if the heat was cued to come on. So I was losing gas mileage and had no heat. Pulled the A/C relay in the engine fuse box and heat worked like a charm.

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