Volks,
I recently repaired my A/C on my '91 Carat.  I had to replace the compressor, everything is solid.  At that time, I changed over to R-134a.  Also, I replaced the dryer and had the system flushed (along with various seals replaced while it was apart).  I'm very happy to report that my R-134a system is very chilly, downright COLD!  I'm looking forward to some real warm weather here in Florida to confirm it's working well.  Keep in mind, my van still isn't tinted (yet), but with our recent warm weather I've had no problems.  Also, I severely restricted the flow of the outside-air intake (in the grill) so keep as much warm air out as is possible (used stainless steel "tape" for this).
I'll let you know how it works, but now with R-134a, should I run low or need to top off, I can go almost anywhere to get it.  Whereas, the first time, just getting it charged with R-12 was a bit of an investment.
   -Robert
-----Original Message-----
From: John Rodgers <jh_rodgers@BELLSOUTH.NET>
To: vanagon@GERRY.VANAGON.COM
Sent: Wed, 21 Apr 2004 10:12:12 -0500
Subject: Re: R-12 alternatives

I have given this a lot of thought since I am having a go at getting my
AC system back up and running. After a lot of consideration I decided to
stick with R12 Freon in the system. It is set up for that. All
components were designed around that refridgerant, I can still get it,
and it is still the best for cooling. I know about the environmental
issues, but with procedures properly followed, impact is reduced. My old
Van is grandfathered in, and as long as I can get the R12, I will stick
with it. Newer vehicle AC Systems are built with engineering for R-134a
as that is the new refridgerant standard, and the new systems work well
with it. But not so well when put into the older vehicles. Works good,
better than the others, has less environmental impact, but not as good
as the old Freon for which they were designed in the first place.

Besides, I want to go back to Alaska and catch a halibut, and that R12
AC of mine will sure-in-heck freeze that sucker, cause it gets cold as
winter in my van when I have it turned on, compared to others.

Yep, I'll stick with the R12.

Regards,

John Rodgers
88 GL Driver