Thermostats can and do fail closed. The air cooled ones used vacuum to
pull closed and has a solder type seal that would melt when over heated to
fail open. Water cooled thermostats use a "Waxman" to operate. If the wax
should leak out which often happens after any overheat it will not open
again next time. That is why they should always be replaced after any
cooling system failure.

Dennis

-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of
Benny boy
Sent: Saturday, July 21, 2007 1:21 PM
To: vanagon@GERRY.VANAGON.COM
Subject: Re: 90 cooling problem

75% chance... yea.

It would be crazy to design such a device that can break in the close
position!!! They are design to break in the open position!

That said, i jave seen 1 broken in at 80% close, only one.

So let's say that he has 5-10% chance, that would make more sense.

Ben
http://www.benplace.com/vw2.htm

On Sat, 21 Jul 2007 16:19:31 +0000, Dave Vickery <davevickery@HOTMAIL.COM>
wrote:

>75% chance your thermostat is stuck shut.  Start with the simple things.