A/C compressor cycling on and off 2001 Trooper

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A/C compressor cycling on and off 2001 Trooper

Postby 1Trooper » Fri Apr 28, 2017 5:03 pm

Hello,

I've noticed recently that my a/c compressor cycles on and off more than I remember in the past. The a/c works well and the refrigerant level is ok. Prior to this happening I noticed that what I call a auxiliary fan would run more often than I remember it running. It is aggravating hearing the compressor clicking on and off so often. Could it have something to do with the pressure switch on the drier?

Thanks
Last edited by 1Trooper on Fri Apr 28, 2017 5:18 pm, edited 1 time in total.
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Re: A/C compressor cycling on and off

Postby DSUZU » Fri Apr 28, 2017 5:11 pm

more than likely your charge is down. Dennis
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Re: A/C compressor cycling on and off 2001 Trooper

Postby 6079smithw » Tue May 16, 2017 12:53 am

FWIW I had the same problem with my '94 Troop. After checking all the usual places for leaks I chased it down to leaky Schrader (core) valves in the fill ports. Replacements went around $12.00 for 2 pair at AutoZone. Replaced the valves, evacuated and recharged, all working fine now. The valves are easy enough to check with the old dish soap/water solution trick. Hope this helps; good luck!
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Re: A/C compressor cycling on and off 2001 Trooper

Postby 1Trooper » Fri May 19, 2017 10:12 am

Thanks. I checked that after I read your post and it was not leaking there. Does anybody know if the pressure switch on the drier can be checked with the GM Tech 2 scanner?
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Re: A/C compressor cycling on and off 2001 Trooper

Postby Darby » Fri May 19, 2017 12:31 pm

If the compressor is cycling on and off the switch is doing it's job. Like Dennis said, you're low on freon. Have someone charge it up.
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Re: A/C compressor cycling on and off 2001 Trooper

Postby 1Trooper » Fri May 19, 2017 1:18 pm

When this problem first popped up I had a shop check this and they said it was too full which could've been true because I bought a charge kit and put some refrigerant in. But they serviced it and said the level was okay now. Still doing it and now I'm trying to figure it out again. I've read that this switch on the drier controls the high pressure, low pressure and the condenser fan and when it is failing it can cause the cycling of the compressor. Just would be nice to eliminate the switch somehow without removing it thus the Tech 2 possibility?
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Re: A/C compressor cycling on and off 2001 Trooper

Postby Darby » Fri May 19, 2017 6:51 pm

You most likely have a leak. Chances are it got low on refrigerant, you put too much in, they let some out, and now its leaked down again. The switch is what's causing it to cycle on and off. It's cutting the compressor off when the pressure is too low to keep from burning up the compressor. As soon as the pressure rises it turns it back on.
Does the dryer have a sight glass? Do you see any white bubbles going past? If so, you are low on refrigerant.
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