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Best thing to do is find a friend that has some AC gauges and run the system to check pressures if its feeling a little weak. If it has worked good in the past and just started to feel weak theres a good chance you have a slow leak and just needs more freon. I'd be surprised if they system still has R12 in it as most have been converted to R134A (atleast in this area) if the service ports take screw on style fittings its still R12 if they take quick couplers its R134A
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