Jim,
R134 systems that are retrofited do not, in my experience, get new hoses
UNLESS the old ones are leaking. Why you ask? Simple the ester oil when
mixed with the mineral oil of the R-12 system provides a very effective
barrier. I would however remember the mechanics motto when trying to bring
back a dormant system "if in doubt change it out."
Rick Ewald
67 B
In a message dated 3/3/99 12:27:34 AM SA Eastern Standard Time,
jimbb88@erols.com writes:
> R-134 systems use "barrier" hoses, since R134 can leak through the old
> type of hose. Smaller molecules or some such. If you convert to R134,
> consider replacing the hoses, which are pretty old by now. Earlier, it
> was recommended to replace the expansion control valve with one specific
> for R134. I do not know if this is still a recommendation, read the info
> on your conversion kit before purchase, try NAPA for replacement valve,
> if required. It is a real pain to replace due to the location, I seem to
> remember removing the complete under dash unit to get to it, not a job
> for the faint of heart.
>
> Jim Stuart
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