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Reply to "Can I put new 134a into an OLD AC system"

I agree with Steve, if the old system will still work with  R-12, just recharge/recycle with R-12.  Look for a shop that works on classic cars and has a supply of R-12 and a recycling machine.  They will not use the same machine on R-12 and R-134 to prevent cross contamination.  The shop will have to evacuate and recycle the R-12 that is left in the system (cannot legally discharge into the air), and add R-12 as necessary to get up to the specified charge.   

Converting to R134a seems like a lot of work (per George's description), and as of the year 2020, or 2021 model year, light duty vehicle manufacturers will no longer be able to use R-134a in their new automobiles. The mandate does not say what they have to use instead but there are very little choices to choose from. Most manufacturers will end up going with the HFO refrigerant known as 1234YF.

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