Check this stuff out:
        http://www.cryochem.com/

I've put the R-12 version in 3 "problem" ACs.  Two of which are my '86 & '88
vanagons.  The Freon would leak out within a month on all 3.  So, far the
jury is still out on the vans as I've only had it in for 2 weeks.  But the
1st vehicle I put it in has been leak free since early spring.

YMMV - Frank

In reference to your message:

 >From owner-vanagon@GERRY.VANAGON.COM  Tue Jul 13 07:49:20 1999
 >Date:         Tue, 13 Jul 1999 07:46:36 EDT
 >From: KENWILFY@AOL.COM
 >Subject:      Re: A/C troubleshooting...
 >To: vanagon@GERRY.VANAGON.COM
 >
 >In a message dated 7/13/99 1:38:07 AM Eastern Daylight Time,
 >JMSHINOSKY@aol.com writes:
 >
 ><< I am doing the troubleshooting on my 88 Weekender A/C system for it
 > blows warm air. I checked the low pressure line valve but I couldnt find the
 > high pressure valve. Does anyone have an idea where will I find the high
 > pressure valve? (FYI: This A/C system is converted to R134 by the previous
 > owner.) >>
 >James the high pressure valve should be under the plastic cover on the
 >driver's side in the opening of the rear hatch.  Remove the cover and it is
 >right there.  Your affliction sounds like low charge to me.  Check the
 >pressures and add R-134a and you should be back on line.  You may want to
 >take the van somewhere for a leak check or add some of that red leak
 >detecting dye in with your oil so you can see  where the leak is and fix it.
 >Ken Wilford
 >Van-Again
 >John 3:16
 >

\\\\////\\\\////\\\\\////\\\\\////\\\\////\\\\////\\\\////\\\\////\\\\////\\\\
Frank Terhaar-Yonkers
Cisco Systems, Inc.
TISU/NSITE
7025 Kit Creek Road  PO Box 14987
Research Triangle Park,  North Carolina  27709
fty@cisco.com   voice(919)392-2101 fx(919)392-5600