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Old 02-19-2006, 01:41 AM
Kebowers Kebowers is offline
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Join Date: Jul 2000
Posts: 638
R134 vs R12 temperatures

For a system designed for R-12--keep it R-12 if at all possible. You may not be happy with the cooling performance and longevity with R-134a installed. It is VERY difficult to get all the R-12 oil (a special mineral oil) out of the system, and just a little is all that is needed to gum up a system filled with R-134a and its synthetic oil. And your R-12 hoses will leterally 'seep' R134a through their pores, causing annual re-charges (complete with legally mandated leak testing, in all probability.

A properly designed system running 134a is just as cold as one running R12. It just takes larger expansion valve, evaporator and condensor and compressor.
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