How can you replace r12 with r134a?

7 Answers

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  • M.
    Lv 7
    12 months ago

    The main problem with the substitution of the older style R12 refrigerant with the newer style R134a refrigerant is the oil. There is refrigeration oil that circulates throughout the inside of the A/C system with the refrigerant, with the purpose of lubricating the compressor parts that move.

    R12 requires mineral oil.

    R134a requires polyolester (POE) oil which is synthetic.

    You must flush out all of the mineral oil because R134a will turn it into a non-flowing, non-lubricating, gelatinous mess that will cause the destruction of the compressor.

    The difficult part is flushing it out of the compressor, and the receiver (or the accumulator). The system has either a receiver/filter/drier or an accumulator/filter/drier.

    Plainly stated: Mineral oil is not compatible with R134a refrigerant.

    -Engine overhaul mechanic and general automotive mechanic since 1972.

    -A/C repair since 1980.

  • 12 months ago

    Replace the valves, evacuate the system, add the correct lubricant and r134a....go to a licensed AC shop and pay them to do that.

  • zipper
    Lv 6
    12 months ago

    YES! But the system has to be flushed out by a vacuum pump and new oil added: but it does work.

  • Scott
    Lv 7
    12 months ago

    You have to install the adapters for the high and low pressure fittings, flush the system with solvent, replace all the o-rings and draw a vacuum on the entire system and then fill the system with the proper amount of R134-A refrigerant.

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  • 12 months ago

    Go to Advance Auto and by the conversion kit for the valves and install them. Then draw a vacuum on the system for 20 minutes before charging the system with 134a.

    Source(s): Mitsubishi Master Tech
  • Anonymous
    12 months ago

    I have no idea.

  • Anonymous
    12 months ago
    Source(s): Internet keyword search. Learn how - it's not rocket science. The answer took less than 10 seconds to find.
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