Q: Trying to figure out what's wrong with my ac

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I was using my ac it was fine then I stopped at a store turn ac off then turn back in and noticed at first a sound kinda like blowing air from my engine then a few mins later it got louder like a grinding noise and another few mins went by I turned it off then back on and got a very loud kinda screaming sound and noticed it wasn't blowing cold anymore so I went back to the person I got it from and he listened to it and looked at it and said I need a new compressor so I turned it off got home and then about 5 hrs later I turned on the ac and it made a strange noise for a few seconds and then completely out of nowere nothing all the sounds went away it was blowing cool air again I looked at compressor and looked like it was spinning perfectly fine basically I'm asking do I need a new compressor or what I don't understand why it would do all that then out of nowere seem like everything is fine thanks

My car has 150000 miles.
My car has an automatic transmission.

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