You can remove the 3/8"-24 UNF adapters and service the ports with the old
R12 fittings.
If you make sure your compressor is properly labeled as having R134a then it
shouldn't present any problems.
I've found the 134 adapters to be faulty in many ways.
Cheaply made.
Valves don't set at proper position.
You now have two valves on each port that never seem to work as a pair.
Fill valves have cheap seals and leak as you fill.

Stan Wilder
Engine Ceramics
214-352-4931
www.engineceramics.com

----- Original Message -----
From: "Todd Lund" <westy4us@YAHOO.COM>
To: <vanagon@GERRY.VANAGON.COM>
Sent: Sunday, July 31, 2005 7:27 AM
Subject: REPOST after List hiccup (AC high pressure line adaptor valve VAG
1637?)

> I posted this question just before the list went down.
>
> My R-12 gauges do not fit the high side service valve
> located behind the closet on my stock non converted
> system. After checking with Bentley I found.
>
> Bentley 87.15 A/C adaptor valve VAG 1637, installing:
>
> "Beginning in May 1988 the threaded connection on the
> AC high pressure service valve was changed from
> 7/16"-20 UNF to 3/8"-24 UNF. Use special adaptor VAG
> 1637 when making a connection to the high pressure
> service valve."
>
> Can someone tell me where I can locate one of these
> adaptor valves?  A quick google for VAG 1637 and/or
> the conversion sizes came up with nothing.
>
> There has to be someone servicing there own AC on a 88
> or newer Vanagon.
>
> Thanks,
> Todd
> 90 Syncro Westy
>
>
>
>
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