Q: Ac trouble

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My ac would stop blowing cold air and I would just shut it off and it it would be cold when I turned it back on. A week ago it stopped blowing cold air no matter what. I changed the relay and it worked drove five minutes and stopped again I changed the compressor worked for an hour and stopped. Since then I've changed the compressor the expansion valve Took it to a mechanic and he said I had a small leak and 2 electrical problems he fixed it worked wonderfully drove it around for less than an hour and it shut off again. I notified that when I turn the ac on my battery meter starts descending. Please help I'm desperate.
My car has an automatic transmission.

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