Don’t Convert to R134a

RustyRatRod said

I agree. Although R12 can out cool 134, if you can't get 134 to cool, you're doin it wrong.

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Vacuum down system, replace expansion valve and dryer and replace oil and R134. Mine been working for years. True, I think the R12 was colder. R12 is what they used in freezers and water coolers.