sounds like the pressure cap blew off while you where sitting at idle. I
would replace the pressure cap and go from there. It could well have been a
defective t stat and it sounds like your saying its not because you lost
coolant when the van was parked idling. I say these are two differant
issuses
replace the pressure cap

Boston Bob
the night tripper

----- Original Message -----
From: "Larry Chase" <roadguy@ROADHAUS.COM>
To: <vanagon@GERRY.VANAGON.COM>
Sent: Thursday, February 17, 2005 9:50 PM
Subject: Engine overheating - Need Advice

> Volks,
>
> The Haus is in the shop and I could use some suggestions on what might be
> going on.
>
> Headed out of town the other day and the engine began overheating.
>
> Thought it might be a stuck thermostat ...but that doesn't seem to be the
> case.
>
> Thermostat  and thermo switch changed and system properly bleed.
>
> Idled engine for 20 minutes .... no problem.
>
> Took test drive at highway speed .... 20 minutes ... no problem.
>
> Back to the shop .... idled another 10-15 minutes ..... started boiling
> over.
>
> BTW .... fan didn't come on.
>
> Any ideas.
>
>
> Larry Chase
> www.roadhaus.com <http://www.roadhaus.com/>
>