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The easiest thing to do is to take the car to your local A/C shop to have it leak tested. One method is to use nitrogen to pressurize the system and check for leaks with a soap and water solution in a spray bottle. I personally use all 3 testing methods to find leaks: ultra-violet light and glasses, soap solution, and a halogen leak detector ("sniffer"). Again, your A/C shop should have and use all three as well. All the fittings are Oring type fittings ranging from #6 (drier) up to #12 (connection on the left side of the hard pipe). It is best to test with the system intact, rather than testing separate components. Chances are your leak is in or around the compressor. That is the usual suspect. You may be better off replacing the compressor and hoses and then check for leaks (standard procedure before a vac and charge)....Rich
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