Seal damage?? I don't think so

Posted by jdemaris on July 17, 2006 at 05:00:32 from (66.218.22.18):

In Reply to: Re: AC recharging... at home? posted by Pooh Bear on July 16, 2006 at 19:44:09:

I've got several cars and trucks that I changed over (R12 to 34A) years ago - and they're fine. No seals got destroyed, and I changed NO internal parts. E.g., 1979 Datsun 280ZX, 1983 Chevy K5 diesel Blazer, 1987 diesel Chevy Suburban, 1985 Ford F250 diesel, 1990 Subaru Loyale, and two 1991 Volkswagen diesel Jettas.
The only component that I know of - that can cause problems when using an R12 designed system with 134A is the hoses. The older rubber hoses intended for R12 will usually leak (slowly) with 134A because the molecular structure of 134A is smaller. If you were to get replacement hoses made for any system - today - it would be the new style "barrier" AC hose that works with anything.
Most of the vehicles I convertered would last all summer, but then leak out most of the gas while going through a winter not being used - until I updated the rubber hoses.
If you've got an older R12 systems that already leaked out, and you install 134A, it will leak out even faster - unless you find and fix the leaks.

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