I am converting a non-working AC system in my 92 to r134 (has not been used in almost ten years). I Will be replacing the compressor, expansion valve, and drier. My question is, I bought this ac flush that is supposed to be blown out with nitrogen, but where would I buy/rent this gas and tank? My second thought was to have an ac shop flush it before the vacuum/fill. I know that I would need to replace all the O-rings, but if I go the shop route, which ones should i replace and which should i leave disconnected for the flush?
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