I have a Behr A/C unit on my Porsche.
It has a Mini Your Compressor 5.5 cui per minute.
I changed the system over to r134a and I added an additional condenser under
the car.
The system now gets down to 34 degrees (f) in the summer months.
The condenser I added was from a Vanagon and measures 12" x 24" x 1" in
thickness.
It just turned out to be a beautiful solution that cost almost nothing but
the price of the two required line adapters to splice into the under car
lines. If you got all your lines overhead it's going to cost more but still
well worth the expense to get a system that has enough MOXIE to cool the
large space.

Stan Wilder

-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com]On Behalf
Of John Rodgers
Sent: Sunday, March 14, 2004 2:10 PM
To: vanagon@GERRY.VANAGON.COM
Subject: Re: A/C tune-up time

Jaime Forero wrote:

>My 91 has an R12 system.  Has anyone done a modification to 134A??  Does
the
>whole system have to be changed, i.e. hoses, compressor evap, etc??  I am
>tired of paying around 35 dollars a can of R 12 to recharge the system.
>Thanks
>
>
Keep in mind that R12 will keep things colder and the only reason for
changing  the injustry to 134a was environmental concerns. Had nothing
to do with how well it perfomed. From my view point 134a is 2nd best.
new car owners have no choice. 134a is the standard. If you want max
performance in a hot, humid summertime climate - Alabama for example -
stick with the R12. If you are in the high dry country of northern New
Mexico, 134a is great.

Me? I stayed with the R12.

Regards,
 John Rodgers
88 GL Driver