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1G R12 to 134a refrigerant & oil

Posted by TK's9d2TSi, Sep 21, 2020

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  1. TK's9d2TSi

    TK's9d2TSi Supporting Member

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    I’m converting from r12 to 134a. For r12, our cars take 33oz of r12 & 5oz of mineral oil. Now that I’ll be converting to 134a, what’s the correct capacity? I’ve read a few threads on this topic and I only found a single post saying you can’t use 33oz of 134a.

    So...
    How much 134a?
    Is mineral oil compatible with 134a? If so, I guess that amount won’t change. If not compatible, what oil and how much?

    Thanks
    Tony
     

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  2. Dericsh

    Dericsh Supporting Member

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    It’s been a while but I believe you want to put about 80-85% of the original capacity then top
    it off if needed.

    you want to look for POE oil, it’s compatible with both types.
     

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  3. Jk's97DSM

    Jk's97DSM Proven Member

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    75-80% capacity but watching the low and high side gauges is key for AC stuff.
     

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  4. TK's9d2TSi

    TK's9d2TSi Supporting Member

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    There was some oil in the evaporator. Can all the oil be removed when evacuating the system?
     

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  5. 1990TSIAWDTALON

    1990TSIAWDTALON Moderator

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    Oriellys sells a citrus type of cleaner that I used on my Chevy Caprice when I flushed it and put all new stuff on her for nice cold a/c.
    @Jk's97DSM is correct in watch the low side and high side on the manifold (do you have a set of gauges Tony?).
    Also, you can still find R12, and it is a colder refrigerant than R134 is. See here...............
    https://www.ebay.com/itm/R12-R-12-r...=283617500746f6693c866ab643b3ab36c964ebeacdc0
    I do my own a/c on all of our cars, so keep the low side pressure to 40 lbs or so and the high side no more than 350.
    That is what I try to do and usually works out well.
    Marty
     

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  6. TK's9d2TSi

    TK's9d2TSi Supporting Member

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    Most likely not but I did see a set of gauges and vacuum pump locally for $100, so I might pick it up just to have it. This way I’ll know if there’s any leaks even if I don’t charge it myself.

    Only oil was in the evaporator so I’ll pull that out AGAIN and flush it out. I know r12 is colder but seems to be harder to find. I read somewhere that you can’t buy it anymore unless you have a license and it’s not cheap so I’m just going with the retrofit
     

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  7. 1990TSIAWDTALON

    1990TSIAWDTALON Moderator

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    I use a guage set like this (yep its cheap but it works good) https://www.ebay.com/itm/3-Way-AC-D...=392927972829010b11f0d2874cecb28a936352fdf8f7
    OR
    https://www.amazon.com/JIFETOR-Mani...jbGlja1JlZGlyZWN0JmRvTm90TG9nQ2xpY2s9dHJ1ZQ==

    and a venture type vacuum pump that runs on my air compressor exactly like this.....https://www.ebay.com/itm/BRAND-NEW-...338922&hash=item23066d2b33:g:RTQAAOSwm8VUu0mX
    OR
    https://www.amazon.com/Goplus-Pneum...operated+ac+vacuum+pump&qid=1600964128&sr=8-7
    I have lots of "friends" that want me to "tune up" their A/C, so this is what I use.
    Just putting it out there.
     

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