Durango A/C compressor question

My wife has a 2001 Durango. She said the A/C was working the other week and now it is not. It just blows warm air. I took a look under the hood and when she turns the A/C on the compressor turns on for a
few seconds and then off 20 seconds or so then back on.
I hope the compressor isn't bad since I suspect it's a pretty expensive repair.
I'm ok with repairs. I just have limited if any experience about A/C units. I don't want to have to dump a grand for a new compressor and the installation and flushing the system and all the rest. I am hoping that it may be a simple electrical issue like a relay. It may just be low freon. Beats me.
Any ideas?
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On Sat, 31 May 2008 09:47:53 -0700, Shane wrote:

fast cycle like that is usually a signal of a low charge.
--
Chris

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Previous answer is correct. You've got a leak and there is a pressure switch cutting the compressor off.

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I added some refrigerant and it allowed the compressor to run, but the pressure went down quick. Apparently, there is a leak. Any good way to troubleshoot the link?
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You can pick up a leak detection kit... it'll have a can of R-134a with a tracer dye in it, and a black light. Charge the system with the can, run it for a while, then go over the whole system with the black light. The dye will glow green. Yours sounds like a fairly gross leak, so it shouldn't be too hard to pinpoint.
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