This is where it pays to keep my "ready-reference" of Factory and Dealer
Parts Fiche handy for questions just like this.

Reference:  VW/Audi (Fort Worth) Parts Fiche dated 1988:

Illustration 17, Vanagon 80-85 w/Dealer Air (Factory AC was not standardized
until the 1984 model year).

Belt - Crank Pulley to Idler Pulley (If equipped)
VW Part Number 255 272 916 12.5 (Now 13) x1150mm
Note:  Superseded to 025 260 849/A/B, same size
Note 2:  This belt is also used on 84-91 Factory Air configurations with the
Crankshaft driving the Compressor directly.

Belt - Idler Pulley (If equipped) to AC Clutch/Pulley
VW Part Number 255 272 911 (No Size is shown in fiche, dang it)
VW obsoleted this belt April, 2000, according to ETKA 7

Idler Pulley Assemblies shown in fiche appear to be mostly for the 80-83 Air
Cooled Models, so I imagine the 025 260 849/A/B Belt is driven direct from
the Crankshaft to the Compressor, at least from what I've seen on late 83
Wassers, very similar to the 84-later Factory configurations.  Myself, I've
never seen this Idler Pulley configuraion on a Wasser, but I have on a
few Air Cooled models.

The 13x1150 belt should be available at most any flaps.  Use the VW
reference numbers and sizing above so that a *good* parts counterperson can
look up a possible interchange.  Most Gates, Goodyear, Dayco, etc., books
have this feature in the back with crossovers.  I know because I have used
them in the past when I worked on the counter a long time ago in a galaxy
far, far away ;-)
--
Jim Thompson
84 GL 1.9 "Gloria"
84 Westfalia 2.1 "Ole Putt"
73 K Ghia Coupe "Denise"
72 411 Station Wagon "Pug"
oldvolkshome@gmail.com
http://www.oldvolkshome.com
***********************************
On Tue, Jun 24, 2008 at 12:22 PM, B Feddish <bfeddish@netreach.net> wrote:

> I was going to remove the hoses from the AC on my 83.5 and have them
> re-made. They both have splices in them and I figured that's where the leak
> was.  Well I did a quick pressure check and not only is there still 134a in
> the system the pressure was reading above the green and a little into the
> yellow. OK, I possibly still have refrigerant in there. The belt broke a
> few
> months ago and I need to replace it. What size is the belt going to the
> compressor? Is it one my VW friendly FLAPS will have or is it a mail order
> item?
>
> Thanks,
> Bryan