Home Forums Mechanical Converting from R12 to R134a Reply To: Converting from R12 to R134a

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I know you’re seeking the lines coming off the drier but for what it is worth – I am certain the drier can be cross referenced at your local parts house if you’re in the US. Here are some things to consider when converting to R134:


R134 molecules are smaller than R12, if your hoses are designed for R12 and are not upgraded, barrier hoses, the R134 will slowly leach through the rubber leaving you to top off the system on occasion. O-rings should also be replaced when converting.


Also you should at the very least replace the accumulator/drier and orifice tube. The system should be flushed to remove any contaminants and oil. Drain the compressor and refill it with Ester oil, as it is compatible with whatever trace mineral oil that may still be in the system.