Question about 1999 Cadillac DeVille

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1999 cadillac deville concours AC problem Compressor & fan are good. However they go on and off, vents blow medium cold air then compressor or fan will stop and car will overheat. AC is charged. Fuses are all good what do you think any suggestions

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On my 99 devillle concours cold air blows from left and back vents but hot air blows from right vents

Posted on Aug 19, 2009

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More than likely u need freon

Posted on Oct 04, 2011

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I have a 93 Cadillac Deville when I turn on the heat it blows a 10 amp fuse and the transmission stops changing gears. What is wrong?


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Jan 10, 2016 | 1993 Cadillac DeVille

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1986 Cadillac sedan deville is my first car. the A/C doesn't work. Air blows out of the vents but it is not cold. I checked the fuse, that is fine. I don't really know what I'm doing, so any...


I would try charging the ac system with some freon,and see if that is the problem,the ac compressor will not come on unless the ac has freon,and enough to turn it on,disconnect the negative battery terminal for 25 seconds before doing this to reset the ac system.

Aug 17, 2010 | 1986 Cadillac DeVille

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Why is my cadillac rear so low


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Nov 24, 2009 | 1999 Cadillac DeVille

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Your heater controller or fan motor blower isn't functioning.

Jun 15, 2009 | 1999 Cadillac DeVille

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If you have a low freon warning you will need to unhook the battery to reset the system before the compressor will run.

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Air conditioner not working.


If your just talking about the fan, the fan is the blower motor. Behind your glove-box is a black plastic box that houses the evaporator(which the blower blows on to give you cold air, the heater-core ( which the blower blows on to give you heat). Your car has both components, the compressor is mounted in front of your car's engine and the fan, you know. Most likely you won't be able to handle repairing the a/c system. You can buy 1lb. cans to charge your a/c but repairing it requires special tools, gauges, temp. readings, containment systems,and so on. But if there is something specific that you want to attempt then ask and 'll try to help.

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1998 cadillac deville reads service ac system


Hi,check if the compressor clutch is engaging,if not check the conection at the compressor if ok check,fuse ,or relay ,if those are fine and the commpressor is engaging,check freon presure ,may be too high or low, if this is the case ,correct the problem and disconect the negative cable from the battery for a minute to reprogram the sistem..C1

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1 Answer

1999 Caddy Deville A/C problem


A/C systems are hard to diagnose without having access to the vehicle. One of the most common problems is undercharge (Not enough freon in the system) indicating a leak somewhere in the system. Other causes could be a burnt A/C compressor clutch fuse, defective compressor clutch, defective compressor/belt, defective High/Low pressure switches in the system, defective evaporator icing switch, defective wiring... Basically, you're better off getting the system diagnosed by a good A/C knowledgeable mechanic...

Aug 09, 2008 | 1999 Cadillac DeVille

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