Steve,

I believe all Vanagons sold in the US with factory air used a freon (R-12)
system.  The connecting fittings for servicing would have 1/4" male hose
threads with dust caps screwed on.  If it is an R-134 system or was converted
to R-134, it would have the R-134 service fittings or adapters, which are a
quick-connect type (male nipple for receiving a quick-connect female hose end).
 Manufacture and sale of R-12 freon is no longer legal, and R-134 type adapters
are required by EPA regulation whenever an R-12 freon systen is converted to an
approved refrigerant such as R-134 or ES-12.  I hope this helps.

Rolf

--- Steve Johnson <stevej@wb32tv.com> wrote:
> How can I tell what is in my AC system now?
>
> Thanks,
>
> Steve Johnson
> ' 91 Carat
>
>
> -----Original Message-----
> From: Rolf Hastrup [SMTP:rhastrup@YAHOO.COM]
> Sent: Tuesday, June 18, 2002 2:46 PM
> To:   vanagon@GERRY.VANAGON.COM
> Subject:      Re: ES-12 Substitute for Freon R-12 or R-134a
>
> A far superior product that I'm very happy to have discovered.
> The ES-12 is simply more efficient than either R-12 or R-134a,
> more compatible, safer for the environment, and costs no more (maybe less)
> than
> R-134a - probably less for charging a given system because less is required.
> Their price for a case of 12 cans is $75, and I needed only 2 cans to fill my
> Taurus system after sucking it out with a vacuum pump.  They also sell
> smaller
> quantities and ship FREE!  I suggest you check out the web site
> <http://www.btt.org> or call the toll-free number (800 266-7777).  They
> market
> all types of refrigerants and have specs for comparison.
>
> =====
> Rolf
> '85 Westy Auto (doing Tiico conversion)
> '88, 95 Taurus Wagons
> '87 Jetta GLI
>
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