The only way to properly diagnose the operation of the temp gauge is with
an Infrared Temp Gun avaliable at radioshack for $50 .  The vanagon temp
gauge system is notoriously unreliable.  Added to the confusion is the
fact that VW changed the specs on the temp senders so your gauge will read
differently (higher) if you replace the sensor with a new one.  This is
another reason why i believe that the VW company is made up of a bunch of
pricks that obviously dont care about vanagon owners.

good luck.

 On Sat, 1 Mar 2003, Bob Bolton
wrote:

> Hi - my 84 waterboxer started overheating yesterday.  Normally the temp. needle
> stays dead centre, right on the little bezel.  Suddenly, as I turned around and
> drove with the wind behind me, it moved up to about 3/4 way up the dial.  But
> as soon as I turned back to windward, the temp. came down again.
>
> The fan is working (though maybe a bit noisier than before?) but doesn't seem
> to be switching on for as long as before.
>
> I'm getting it looked at tomorrow, but suspect the little temp sensor switch
> screwed into the radiator, that turns the fan on.  Does this sound reasonable?
>
> Any ideas most welcome!
>
> Bob
>
>
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