Question about 1999 Buick Regal

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A/c compressor kicks on, but no cold air..checked all the fuses and relays. Everything seems fine. Any one knows what could cause this?

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Well if you dont have freeon it wont be cold and also you may need your condensor checked had an 03 jeep grand cherokee laredo that the condensor went bad and had same symptoms.

Posted on Aug 09, 2009

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2004 ford expolorer air conditioning will not stay on


I would suspect the AC compressor cycling switch (located in low pressure line from compressor) or a AC cutoff wide open throttle relay ( in under hood fuse and relay center) would be causing this problem.

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A/C Compressor wont kick on unless jumped in fuse box using a paper clip. Compressor does not kick on with relay in place. Freon levels are between 35-40psi on low and 190-200psi on high side.


Normal pressure with the engine-compressor off is outside air temp. So both gauges would read 70 or 80 or whatever.
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One thing that comes to mind to test is the low pressure switch.

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My vehicle's a/c compressor will not kick on, so there is not any cold air. when a current is applied directly to the compressor, it kicks on nice cold air. There is something preventing the current...


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Honda Accord 2003 4dr LX - AC does not cool always. The compressor does not kick in every time. When it comes on, it is very cold But otherwise there is no click sound. I got it checked by the mechanic...


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My air con does not deliver cold air. I had it diagnosed by an air con specialist who said the compressor had an open circuit fault and needed to be replaced. My local garage replaced the compressor at the...


to hear things like this really bugs me why would any mechanic replace a parts not knowing that is the problem and call them self a mechanic. Going to give you the best run down as I can think of, and at least we know now you have a new compressor and we can leave that out as the problem.
1 check for leaks, If no pressure your compressor will not run. a dye can be added when charged the
system to see any leaks may exist by using black light.
2 check pressure switch & pressostat making sure is not faulty, if it faulty, the switch will not sense
any pressure to kick the compressor on.
3. check AC fuse, making sure is not blown, if blown no power to ac switch
4. check AC relay, making sure is good relay, bad relay compressor will not work or kick on.
5. Make sure your have no moisture or air in the system, system will not operate up to 100% if any
of those items exist in the system, best way to charged the system is to vacum the system out
first removing any moister and air in the systems, keep in mind, air is 02 can convert into
moister/water molecules if its cold enough.
6. expansion valve faulty, this unit usually goes out like compressor do. it sense the temperature,
regulate refrigerant flow to evaporator. everything may run and operate correctly, if this unit goes
bad it will restrict refrigerant flow cycle and evaporator will not get cold.
I would replace number 6, eventhough if its not bad, it need to be place regardless because of the year of your vechicle, cost 5 bucks. Note: My guess, when you push the ac button do you hear the compressor kick on, if not my guess would be 1 and 2. replace.. If your compressor is running than it would be no. 6 and make sure you have lots of feon in the systems. good luck, hope that help some.

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It could be your low pressure cycle switch is going bad. Check the connection to the switch and it's is located on the A/C Accumulator. The other thing to check is the A/C relay and that is located in the glove box. There is a panel in the glove box that say's relay, there is three relays in there and one of the out side relay's out of the three is the A/C. can not remember which one it is. The middle relay is the fuel pump and the other one is the third break light. Switch the two out side relays and see if your A/C get's better. the other thing too is if the R134a is just a little low, and needs to be topped off. Good luck and hope this helps. if your going to try to recharge the A/C system your self, keep in mind not to over charge.

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