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Thread: AC compressor cycle?
03-25-2012, 01:08 AM #1
AC compressor cycle?
I posted this in the yukon forum and never found an answer so I thought I could try here. I have noticed that my AC compressor seems to cycle off and on a lot. I understand why it would do it if I had the auto climate control on. Does anyone else notice this with theirs? Any ideas why this does it? How to fix it? Seems like I could be losing MPG and wearing the compressor. The compressor clutch turns on as soon as I turn on the climate control switch and it stays on. Whether it be on full heat or not. When the ac is on it is cold. I switched the relay out with a know good one and still have the same issue. I have been driving with the windows down and the climate control off and my MPG has increased. Any thoughts would be really appreciated! Thanks
1995 Silverado 4x4
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2002 Silverado ext cab 2wd (Sold)
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03-25-2012, 03:26 PM #2
Don't know a whole lot about a/c but I do know that when the defrost is on the pump will kick on. The manufacturers did this to keep the system cycling during the winter to keep all the o-rings and other compnents lubricated. Thats why the majority of the systems lasted longer (no leaks) now than when the a/c systems first came out.
03-25-2012, 09:42 PM #3
03-26-2012, 01:55 PM #4
I spoke with a mechanic I know. He said that it could be the control unit or a module that controls the system. I have a friend trying to locate a good control unit, I will swap them out and try it. If it is not that I may actually have to pay the dealership to look at it!! That will not be cheap.
03-27-2012, 12:19 AM #5
I noticed a while back that when I turn the AC on the snow flake on the screen has a line thru it. Is that normal? It has the auto climate control system.
03-27-2012, 03:38 AM #6
Hey bud.. there's a sensor on your compressor that kicks your compressor on/off based on pressure. This switch could have gone haywire, or your system could be low on 134. Just a possibility I'm throwing out there to keep from replacing any unnecessary/expensive control units. I hope this helps. Keep us updated!
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03-27-2012, 10:32 AM #7
I agree with 08_rado_rocker. When the compressor gets low on refrigerant, it will cycle more often to maintain the high and low pressure differential. Your AC can still be cold, but needing more refrigerant. Also, your refrigerant contains the lubrication for the AC compressor, so having it cycle more frequently also means it is probably in need of more lubricant.csltrains96
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03-27-2012, 01:10 PM #8
Ok, Thanks guys! I will borrow a gauge from my neighbor and see how much is in there.
03-27-2012, 07:54 PM #9
03-27-2012, 09:03 PM #10
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