Question about 2002 Mercury Sable

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Warm AIR comes out WHEN AC UNIT is on i just

Warm AIR comes out WHEN AC UNIT is on i just notice that the compressor does not turn on..

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Possible Low on Freon, Bad Compressor Clutchhead, Blown hose, which in turn let all the freon out. Manually power up the single wire going to the compressor with the car running and see if the compressor clutch head turns on. If so Odds are the compressor is good. Check all hoses and compressor for buildup of oil which would be assumed as a leak.

Posted on Sep 06, 2010

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AC only warm air is coming through the vents


there is a clutch under the pully you see turning that allows the belt to turn without running the compressor.you may want to check the optimum pressure rating for yuor truck.it sounds to low to me.check that with your local auto parts dealer.hope this helped

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A/C is not blowing cold air and clutch on the compressor will not engage.


Most likley needs to be recharged. Shouldnt be low, but if it has ever been in an accident it may have a leak or your mechanic stole the refridgerant when it was cold outside and you didnt notice untill you turned the ac on.

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I think the air compressor is bad in the truck


If your refrigerant level is OK and the truck blows cold air your compressor should be fine, in which case the noise is probably coming from the AC clutch which isn't too expensive or difficult to replace. If it doesn't blow cold air, switch the AC on and watch the compressor. If the clutch engages, but the compressor doesn't turn, the drive belt will squeal loudly and probably start to smoke. In that case it is the compressor which is expensive to replace. Most vehicles have an AC bypass that will temporarily cut out the compressor clutch under heavy load. If you are going uphill with the AC on or accelerating heavily you might notice warm air coming out of the vents for a short period until you let off the gas.

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