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Unresolved R134a loss, is it the compressor?

I am $6500 into my a/c system, I have replaced lines valves, multiple evac and recharges, pressure tests yield no loss of pressure. there is no UV dye anywhere on the truck.

I have been told that an compressor will not show oil leaks if one of the seals is bad. is that true?

Answer this question I have this problem too

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no its not true,compressor seals will show a leak,problem with r134a is it can wash away with water.put dye in the system check for leaks with a black light ,works better at night.kits are cheep at auto part stores. and stay away from the places that have worked on it.

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There is no dye leaking anywhere, I have checked the evaporators and all of the lines.

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Just keep charging it with 134 A with dye and it will eventually show up.''''italic text

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how long does it take to leak down to where the a/c is inop,did they try finding the leak with an electronic sniffer

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.5 lbs per hour at a 1000 rpm idle.

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thats a big leak,if you can't find dye and electronic sniffer,does not find it,try spraying soap on fittings,condenser,e-vap,compressor.on my truck the dryer sits near the front tire road debris could hit it.

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Another thing I have done as a last resort is to evacuate the system, charge the pow side with about 60 lbs nitrogen, and chase the whole system with soap/water mix.

Sounds stupid, but nitrogen has smaller molecules than air and will show up many more leaks than just refrigerant or even dye. I have found many leaks this way, where as the dye never showed up.

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Not stupid....we always pressure checked the A/C system with Nitrogen to check for pressure drop and leaks but if it has a slow leak if you keep charging with dye it has to show up eventually. You just keep looking for it.

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Have you checked the evaporator core in the cab and sleeper?

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yes, no leaks.

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Jason Burns will be eternally grateful.
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