A/C Question. (yep another one)

I took my 94 S10 P/U in to get the A/C recharged. It had a leak that would leak down in the course of a few days. I took it in to have all of the "o"
rings replaced and have it evacuated and recharged and tested again for leaks. They found the schrader valves were leaking and replaced them and recharged again. Two days later the system was empty again. I took it back and the they replaced the shrader valves again. They showed me where the oil was on the protective caps so I agreed that it had to be leaking there. They recharged it and the next morning, No A/C again.
Here is my question, these guys appear to have a good machine for evacuating and recharging but I have never seen them use one of those electronic leak detectors to look for leaks. I am concerned that this is going to become a series of parts replacements till the leak goes away solutions. I don't want to waste a bunch of money on this car only to find out the compressor is leaking which is more that I want to put into this car right now.
Does anyone have any suggestions as to what I need to talk to thew service guy about when I bring it back in. Any thoughts or suggestions will be most appreciated.
Tim
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What I would do is recharge it your self if you have the equipment but put in a type that has the oil dyed I forget what it is but I found one that had a green dye in it but when I was curious I checked under the hood with a black light and the leak was obvious it glowed bright blue. Hope this helps.
Justin

oil
They
evacuating
want
most
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You need to find a professional shop. Oil on the caps is not necessarily an indication of a leak. It might be just sloppy workmanship. A competent tech will put a small amt of gas in to pressurize the system and then look for the leaks with a leak detector. Once all the leaks are fixed only then will he evacuate it and recharge.
Randy

oil
They
evacuating
want
most
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I wish I knew where one was. I thought I had found one here since he had good equipment and seemed to have good working knowledge of A/C. Anyway, at this point, he is not charging me more money so I want to give him a chance. When he wants more money I will consider other shops. The problem is, I won't know if the new shop is any better or worse than him. BTW he did clean out the caps and the valve openings before I got it back last time. I watched him do it.

an
tech
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Randy is absolutely right with "You need to find a professional shop. Oil on the caps is not necessarily an indication of a leak. It might be just sloppy workmanship. A competent tech will put a small amt of gas in to pressurize the system and then look for the leaks with a leak detector. Once all the leaks are fixed only then will he evacuate it and recharge. Randy ============================ To put this in perspective,I took my car into a shop because it leaked down in ONE YEAR. He put 300 lbs pressure of nitrogen+freon and used a halide detector to find a very small leak and charged me $40. It's been good for 2 1/2 yrs now.For your system to leak down in one day is ridiculous and you should take it somewhere else and ask if they use a halide tester.Make sure they test the air vents in the cab which would show a leak in the evaporator. Brian O
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