the autofrost technical information (using acrobat) states that R134a is a
single compound (not a mixture). It states that R134a is HFC while R12 is
CFC et et et. Lots of info there, haven't read it all yet!

>From: "Richard A. Jones" <jones@COYOTE.COLORADO.EDU>
>Reply-To: "Richard A. Jones" <jones@COYOTE.COLORADO.EDU>
>To: vanagon@GERRY.VANAGON.COM
>Subject: Re: AC Charge Question80
>Date: Sat, 30 Jun 2001 17:58:04 -0600
>
>R134a is a mixture while R12 (Freon) is a single
>compound.  I have read that the sight-glass is only
>useful with R12.
>
>Also, the charge of R134a is typically ~80% of
>R12 and should be calibrated by gauges and
>output temps.
>
>Good info at
>http://www.griffiths.com/achelp/achelp1.htm
>
>                                     Richard A. Jones
>                                     Boulder, Colorado
>                                     '81 Vanagon  Mr Bus
>                                     '87 Syncro Westy    El Jefe

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