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Re: Releasing pressure from A/C system?
Yes, that valve is used to recover refrigerant & re-charge the system. (there are two, one on the high pressure side & one on the low) You may not need to disconnect the hoses though. If you just want to remove the compressor from the bracket you can unbolt it & move it to the side with the hoses/lines attached. When I do engine swaps this is the way I do it so I don't have to recover / re-charge.
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