A/C Retro Fit - R406A

Chris Covington malth at umich.edu
Fri Jun 21 11:16:09 EDT 2002

It doesn't work well with Audis because:

"Q. Do the hoses, driers, or the oil need changing?

A. In general, no. Most American built cars have used nylon lined
"barrier" hoses for years. These are fine for Autofrost. Some real old
cars, foreign cars, and cars with "port of entry" add - on A/C systems may
have "nitrile" rubber hoses, which can leak R-134a and all currently legal
alternative refrigerants at a higher rate, It is therefore recommended
that nitrile rubber hoses be replaced. All current replacement hoses are
now of the barrier type. Unless the oil is contaminated by a system
failure, it does not need to be changed, Autofrost works fine with the
standard mineral oils (usually 525 viscosity) used in R-12 systems and
does not require any additives. If you change the oil, replace it with the
same mineral oil as was in the R-12 system. Alkylbenzyne based (AB) oils
also work fine."

However, if anyone here has had luck with R-134A, then Autofrost should
work fine, and even better.  In my experience, the Autofrost leaked
through the hoses and R-12 did not.  I would have liked to have used
Autofrost, but I didn't want to get all new hoses.

'91 200q20v

On Fri, 21 Jun 2002, Rich Andrews wrote:

> Has anyone had any experience with George Gobel's R406a?  The web site
> is http://www.autofrost.com.
> George is fairly well known for his antics with liquid oxygen.
> George's main page is at http://ghg.ecn.purdue.edu/~ghg.
> rich
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