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if the a/c does not have a charge, then yes. If they are charged, then prepare for a face full of nasty ass freon that will pb make you sick as a dog. I would just let a shop discharge the system. They will give you a credit or money for it.
press the schrader valve in on any line high or low and see if anything comes out. then you will no for sure not the enviro friedly way but just bleed it.