It should be fine.  You should only need one o-ring.

Ken

On Sat, Jan 22, 2022 at 1:59 PM Mark McCulley <markmcculley@gmail.com>
wrote:

> The bypass valve on the thermostat housing is off, fully clockwise.
>
> I see I have a new thermostat housing, plastic, 025 112 114.
>
> I have a spare thermostat Behr 025 121 113F. It has 2 o- rings in the box.
> I’ve probably had this part for 10 yrs or more, any reason I shouldn’t
> install it today?
>
> -Mark
>
> Sent from my iPhone
>
> > On Jan 22, 2022, at 9:28 AM, Mark McCulley <markmcculley@gmail.com>
> wrote:
> >
> > 
> > That wouldn’t explain why one coolant pipe was cold when I stopped would
> it?  The gauge didn’t just instantly change, it was gradual, but fairly
> quick.
> >
> > I think I have a spare thermostat with me, I may install it today. Don’t
> have a full set of tools, but I have 10 and 13mm  spanners and I think
> that’s all I need.
> >
> > I neglected to mention this is a syncro, if that matters.
> >
> > Original oil cooler is still present, no mods there.
> >
> > Thanks for your assistance Dennis.
> >
> > -Mark
> >
> >> On Sat, Jan 22, 2022 at 6:34 AM Dennis Haynes <d23haynes57@hotmail.com>
> wrote:
> >> Is it possible that you have a gauge-connection problem? If the engine
> was really going cold it would seem the oil temp would also drop especially
> if still using the original oil to coolant heat exchanger.
> >>
> >> Dennis
> >>
> >> -----Original Message-----
> >> From: Vanagon Mailing List <vanagon@gerry.vanagon.com> On Behalf Of
> Mark McCulley
> >> Sent: Friday, January 21, 2022 10:36 PM
> >> To: vanagon@GERRY.VANAGON.COM
> >> Subject: Re: On road, Having problem, coolant related
> >>
> >> I don’t know specifics on the thermostat but it was installed by a shop
> that specializes in Vanagons.  I will ask them when I take it back for
> repair.
> >>
> >> We continued to destination, temp gauge was all over the place though
> never too hot. I could not correlate with anything including turning front
> heat on and off. Oil temp stayed steady at around 200F. Ambient air temp
> was 45F not very cold. I will check the bypass valve tomorrow.
> >>
> >> Thanks,
> >> Mark
> >>
> >> On Fri, Jan 21, 2022 at 4:42 PM Dennis Haynes <d23haynes57@hotmail.com>
> >> wrote:
> >>
> >> > As the Vanagon has such a massively, oversized cooling system along
> >> > with an extremely large heater core, getting hit with cold outside
> >> > air, keeping the engine up to temperature can be a challenge during
> very cold weather.
> >> > VW became aware of this early on and the fix was the series "F"
> thermostat.
> >> > This stat features a delayed but fast acting response to temp and the
> >> > disc that seals the is further gasketed to prevent any bypass while
> >> > closed. So do you have the correct t-stat? Further, for the correct
> >> > stat if not of the Vanagon specific design, the lower disc can be too
> >> > large diameter and cause the stat to wedge and get stuck open. Also,
> >> > as the bypass will close too early from this excessive cooling will
> >> > also result from the lack of mixing the hot coolant leaving the
> engine
> >> > with the cold coolant coming from the radiator. The thermostat set up
> >> > is really a mixing valve and part of the goal is for the coolant to
> >> > always be flowing through the engine keeping the heads and case at
> the same temperature.
> >> >
> >> > Next, on top of the thermostat is that small hose and bypass valve.
> >> > Make sure that valve is closed.
> >> >
> >> > Try closing the heater valve to see if that brings the temp up some
> >> > and next step is block off part of the radiator.
> >> >
> >> > Dennis
> >> >
> >> >
> >> > -----Original Message-----
> >> > From: Vanagon Mailing List <vanagon@gerry.vanagon.com> On Behalf Of
> >> > Mark McCulley
> >> > Sent: Friday, January 21, 2022 3:18 PM
> >> > To: vanagon@GERRY.VANAGON.COM
> >> > Subject: Re: On road, Having problem, coolant related
> >> >
> >> > Thanks Ken. Not optimal, I know but is it safe to continue? Loaded up
> >> > for
> >> > 2 days camping with wife and dogs. 75 miles to destination, 40 to get
> home.
> >> >
> >> > Sent from my iPhone
> >> >
> >> > > On Jan 21, 2022, at 12:11 PM, kenneth wilford <kenwilfy@gmail.com>
> >> > wrote:
> >> > >
> >> > > 
> >> > > Sounds like thermostat has failed open.
> >> > >
> >> > > Ken
> >> > >
> >> > >> On Fri, Jan 21, 2022, 3:04 PM Mark McCulley
> >> > >> <markmcculley@gmail.com>
> >> > wrote:
> >> > >> This is a weird one.
> >> > >>
> >> > >> Coolant gauge started going LOWER while driving at 65mph for 30
> min.
> >> > Pulled over to check it out, by then gauge was like it was a cold
> engine.
> >> > >>
> >> > >> -GW expansion tank is full.
> >> > >> -One of the 2 hoses from engine to radiator is cold.
> >> > >> -Radiator is cold.
> >> > >> -No coolant leaking.
> >> > >> -Oil looks good
> >> > >> -I opened bleed screw on radiator and no air, just coolant.
> >> > >>
> >> > >> After stopping 10 minutes I started van and temp came up to normal
> >> > >> and
> >> > radiator got hot. Then a get running a few minutes the temp gauge
> went
> >> > back down.
> >> > >>
> >> > >> I recently had the entire cooling system renewed, new everything.
> >> > >>
> >> > >> I have the rear heater core out and both hoses are plugged
> >> > >>
> >> > >> Ideas?
> >> > >>
> >> > >> -Mark
> >> > >> 87 Westy
> >> > >>
> >> > >>
> >> > >>
> >> > >> Sent from my iPhone
> >> >
>