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There are a couple of automotive A/C leak detection methods; sometimes you can find the leak by looking for oil and dirt residue on connections, hoses or on the compressor. Some shops like to charge the system up with R134a, use an electronic leak detector to locate the leak and if that doesn't pinpoint it, add a florescent dye to the system which you can look for with a UV/black light when it leaks out. I personally would pull a vacuum, add about 4oz of R-22, pressure the system up with 200 PSI of dry nitrogen, then go over the hoses and external components with a soapy water solution, then check the evaporator and shaft seal on the compressor with an electronic leak detector. I always find my leak!

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