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Thread: A/C flush

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    A/C flush

    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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    It sounds like since I am disconnecting every joint to flush, that I should be able to use an air compressor to blow out any residual flush. Any residual moisture from the compressed air should be able to be vacuumed out no problem. So I am going with that.

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    Compressed air will work fine. Leave the condenser and evaporator cores open to air for a while to allow the flushing solvent to evaporate, you won't get it all out with air/nitrogen.

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