At  7/8/2006 08:15 PM, John Rodgers wrote:
>Maggie,
>
>Do I under stand that you WANT to run R134a in your system??
>
>As I understand it, to use Freeze 12, supposedly a near perfect
>replacement for Freon R12, the R12 system must first be converted to a
>R134a system in the first place, and then and only then can you convert
>to Freeze 12 So you actually go from Freon R12 to R134a then to Freeze 12.
>
>I have not actually seen this, but I suspect that one reason for this
>R134a conversion BEFORE using Freeze 12 is that you must use the R134a
>fittings for the Freeze 12. I could be way wrong about that, but I
>certainly would find out.
>
>Regards,
>
>John Rodgers
>88 GL Driver

All this Freeze 12 talk and the fitting sizes got me interested so I
did some checking. Interesting reading.

http://www.freeze12.com/
This place has the Freeze 12 fitting sizes listed
http://autorefrigerants.com/co00031.htm

Here is the only place I have been able to find what sizes r134a requires

http://www.everything2.com/index.pl?node_id=1674978

 >>Service fittings - These are used to add or remove refrigerant, or
diagnose the system with gauges. R-12 uses a screw-type service
fitting. R-134a uses a quick-release type. In order for a conversion
to be done properly, these fittings must be replaced as R-134a
equipment is required to use these quick-disconnect fittings. <<

Freeze 12 requires (?) screw ons and 134a quick release.

If you interested in the 12 to 134a swap here's what the epa says
about it http://www.epa.gov/ozone/title6/609/

I had my '87's AC on today, I opened the back windows too <g>.

Rob
becida@comcast.net

With a '91 Subaru 2.2 in an '87 Vanagon in western Washington.