so we are talking about a Thermostat for air-cooled Type IV VW engines..

ok...nice to know.
all right..
starting all over ..
sounds like they are working to me..
just late in opening ..
for winter..
you sure want it warm..
( and there might be cable length adjustment ..??..
I try to stay far away from anything vw and air-cooled these days )

if for get the temps you said ..100C is 212F of course..
doesn't seem like the t-stat should try to keep the engine that hot.
so maybe they are both faulty.
I'd think it would aim for something like 160F ...
just a guess.

The vast majority of people on this list that have and drive gasoline
vanagons have waterboxer engines ..
so when you just say 'thermostat' ..
that is where their mind will go.........to a liquid cooling type t-stat for
vanagons,.
Scott
www.turbovans.com

----- Original Message -----
From: "Mike S" <mikes@FLATSURFACE.COM>
To: <vanagon@GERRY.VANAGON.COM>
Sent: Saturday, January 07, 2012 7:05 PM
Subject: Re: Thermostat Woes

> On 1/7/2012 5:15 PM, Evan Mac Donald wrote:
>> Are they BOTH dead, or have I missed something? It should be fairly
>> obvious,
>> shouldn't it? The movements are not glacial, or the engines would
>> overheat,
>> right?
>
> Actually, they do move pretty slowly. I have an AC engine, but assume
> the WC uses the ubiquitous wax pellet type of thermostat. There's a
> small round cylinder on the engine side, inside is a pellet of wax made
> to melt over a specific temperature range. As it melts, it expands,
> pushing a rod to open the valve plate against spring pressure. The rated
> temperature is where they first begin to open, they don't open fully
> until the temperature is 10-15F higher.