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AC Compressor replacement

I have a 1995 GMC Suburban with rear AC controls. The AC Compressor is dead, locked up - does not turn… How much work is it to replace the compressor and the Accumulator? Do I have to flush the system with nitrogen? Anything else you can offer would be appreciated!

You need tools and experience few people have at home. I suggest finding a local A/C shop (up north look for radiator shops.) Let them give you an estimate.