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Thread: R134a Conversion - what's involved? Links?

  1. #1
    Join Date
    Aug 2004
    Posts
    162

    Default R134a Conversion - what's involved? Links?

    Hi,

    Had the 535's system evacuated as a prelude to replacing the pressure switch and found that only 1.5 pounds of R12 came out, in a system of over 4 pounds capacity.

    Maybe this is a good time to switch over to R134a. Is there a faq that explains what items need to be replaced? Will I also need a different pressure switch and so should return the one I just bought?

    Any ideas why I lost so much R12 over a six year span? Normal?

    Input most welcome.

    Thanks,
    Adnan

  2. #2
    Join Date
    Jan 2004
    Posts
    4,150

    Default Hi Adnan, 4 ounces per year in a tightly sealed system is considered

    normal leakage. Heres the document and the parts numbers for a conversion kit from bmw

    On my own car i would use freeze12 though. its 9.95 a can and is compatible with the existing seals and oil in the system, no changeover needed other than empyting all the r12 out and changing fittings to identify the type of refrigerant you'll be using.











    Quote Originally Posted by Adnan
    Hi,

    Had the 535's system evacuated as a prelude to replacing the pressure switch and found that only 1.5 pounds of R12 came out, in a system of over 4 pounds capacity.

    Maybe this is a good time to switch over to R134a. Is there a faq that explains what items need to be replaced? Will I also need a different pressure switch and so should return the one I just bought?

    Any ideas why I lost so much R12 over a six year span? Normal?

    Input most welcome.

    Thanks,
    Adnan

  3. #3
    Join Date
    Aug 2004
    Posts
    162

    Default Thanks, Bill!

    Hi Bill,

    Thanks a bunch. I'll look into this freeze12 suggestion, as it sounds pretty good.

    BTW, I had the thrust arms retorqued at load height.

    Regards,
    Adnan

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