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Originally Posted by gdanaher

If your friend operates an a/c shop then he is going to have a handy dandy device that can actually smell and locate the leak. Sounds like a geiger counter. In the mean time, put some soapy water on the two valves if you can and see if they are leaking. Valves can leak more than hoses.

cool by valves, you mean the H and L capped sections right?