Thread: Insulating the AC system???

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Originally Posted by rspears

Did you change out your flex hoses when you switched to R134a?? I believe that the material used for R12 is too porous for R134a - the molecules in R134a are smaller, and your charge will slowly leak out if you are running old hoses. You might give someone at Vintage Air a call and be sure I'm right on this before you change any parts, but I think I'm telling you right.

I read an interesting nugget on the hoses.
It said that an R-12 hose that's actually had R-12 run thru it previously would be fine.
A brand new R-12 hose that uses R-134a right away will leak.
Of coarse all the o-rings should be the green ones for 134a.