99 regal a/c prolems - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 08-22-2012, 08:28 PM   #1
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Default 99 regal a/c prolems

I bought this a year ago from friend, he says it loses all it'* freon and had suspected the cooling fans. I verified both fans work by pulling coolant temp sensor plug. how do i check if fans come on at proper time before i charge system? what else besides a leak could cause freon evacuation?
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Old 08-23-2012, 08:20 AM   #2
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generally the way it works is there is a pressure sensor thats connected to the pcm and the pcm controls fan operation depending on pressure and engine temp. so the only way to really see is with a bidirectional scanner.

as far as the leak, a leak is a leak. some say the compressors are designed to let some out but thats not true. i put some nitrogen in and listen, and squirt around suspect areas with dishsoap and water in a spray bottle. any bubbles and you have found your leak. you could use refrigerant but its not really that cheap and environmentaly correct. once you fix the leak it needs to be vacuumed down a couple times and charged
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Old 08-23-2012, 09:33 AM   #3
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Cooling fans would have nothing to do with the A/C system losing freon.
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Old 08-23-2012, 01:30 PM   #4
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But what if the fans w/n run when called for? Could that cause the a/c system to overheat or overpressure? What would the end result be then? I know it could cause the engine to run hot or overheat, just wondered how this related to the a/c system?
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Old 08-23-2012, 07:44 PM   #5
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I think if the fans did not turn on, then you would just experience luke warm air, and higher than normal engine temps. The PCM is already programmed to prevent the compressor from coming on if it sees a high or low pressure anomaly. So with that, I would be safe to say, your leak is coming from somewhere else.

If you can, put 1 can of freon w/UV dye in it and inspect all lines with a UV black light.
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Old 08-28-2012, 10:22 PM   #6
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Ok so with new compressor, drier, orfice, a good flush annd charge everything is working.
Strange thin is passenger side is blowing realle cold while driver side is kinda warm, on floor and dash. Any suggestions what to look for? What about the flip from cold to warm? note i got when i bought the car says valve will not change itself, has to be done manually. what to look for in this situation?
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Old 08-29-2012, 08:42 AM   #7
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i would guess there is an actuator for position thats not working
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