hi Dennis and all,

Here are the pics of the thermostat I have.

80°C Calorstat
https://www.thesamba.com/vw/forum/album_page.php?pic_id=2171931

80°C Behr
https://www.thesamba.com/vw/forum/album_page.php?pic_id=2171930

87°C Mahle
https://www.thesamba.com/vw/forum/album_page.php?pic_id=2171929

thanks

dan

On Fri, Apr 23, 2021 at 4:30 PM Dennis Haynes <d23haynes57@hotmail.com>
wrote:

> Shoot me a picture of the stats and part numbers.
>
>
>
> Dennis
>
>
>
>
>
> *From:* Dan N <dn92610@gmail.com>
> *Sent:* Friday, April 23, 2021 5:46 PM
> *To:* Dennis Haynes <d23haynes57@hotmail.com>
> *Cc:* Vanagon Mailing List <vanagon@gerry.vanagon.com>
> *Subject:* Re: Thermostat with a hole?
>
>
>
> @ Dennis,
>
>
>
> I do believe the works of the engineers... but what I found/compared got
> me confused...
>
>
>
> @ Jim and Raimund
>
>
>
> I bought for each of my vans one thermostat in 2017 as a spare, sitting
> under the bench ... I took them out to look at the temp. the Behr and Mahle
> have a 1/16 hole. the Calorstat has a 1/32" hole... now the mystery is
> deeper... ouchhh  :-(
>
>
>
> thank you guys.... and have a good weekend.... :-)
>
>
>
> On Fri, Apr 23, 2021 at 1:42 PM Dennis Haynes <d23haynes57@hotmail.com>
> wrote:
>
> Pre-warm the cold coolant! On many vehicles with a single disc thermostat
> located away from the head on a manifold or the like, some coolant must be
> allowed to flow toward the thermostat so that it can respond as the coolant
> heats. Sometimes this will be with a bypass hose or port close by or with
> that hole. Sometimes that hole will have a bobble pin or something that can
> close when pushed up. This is to help bleed after filling or if the system
> is low allow the pump to push the coolant up to the stat so again it is
> siting in the coolant so it can respond.
>
> On the Vanagon and many VW's the thermostat is a mixing valve. Critical on
> the Waterboxer since the engine is actually 2 separate cooling jackets, one
> for each side. For it to work coolant must always flow from each side and
> mix to keep both sides at the same temp. As the stat opens coolant from the
> radiator can be pulled in and the bypass closes. Things get messed up when
> the wrong stat with the larger lower disc is used which closes the bypass
> early or worse can get stuck and prevent the top from fully opening.
>
> Dennis
>
>
> -----Original Message-----
> From: Vanagon Mailing List <vanagon@gerry.vanagon.com> On Behalf Of Jim.
> Felder
> Sent: Friday, April 23, 2021 4:09 PM
> To: vanagon@GERRY.VANAGON.COM
> Subject: Re: Thermostat with a hole?
>
> These thermostats with a hole were common 20 years ago but I have not seen
> them since. It seems the better German ones had the holes. I know of a shop
> that still drills Vanagon thermostats, their stance is that the hole helps
> pre-warm the cold coolant on the other side of the thermostat and prevents
> air bubbles in the system by equalizing pressure on both sides of the
> closed thermostat. I personally see no need to drill them or to go out of
> my way to find drilled ones.
>
> Jim
>
> On Fri, Apr 23, 2021 at 11:42 AM Dan N <dn92610@gmail.com> wrote:
>
> > thank you Dennis,
> >
> > I think the thermostat in there doesn't open fully. When the engine is
> > warm, usually the coolant temp. needle sits on the bottom side of the
> > red LED, now it sits a bit higher on the other top side of the red
> > LED. When I open the heater at full the temp. needle doesn't move down
> > at all. It's working, no overheat but I feel that something wrong/lazy
> > with the thermostat. I could be wrong but I don't feel comfortable with
> what I see.
> >
> > dan
> >
> >
> > On Fri, Apr 23, 2021 at 9:25 AM Dennis Haynes
> > <d23haynes57@hotmail.com>
> > wrote:
> >
> > > What problem are you trying to fix? As the Vanagon cooling system
> > > has so much reserve capacity especially during cold weather getting
> > > the engine
> > up
> > > to temperature is actually a concern. The latest OEM thermostat,
> > revision F
> > > not only does not have a bypass, the top throttle plate is actually
> > > gasketed to prevent any bypass from the radiator until it actually
> > > moves
> > to
> > > open. With a good stat this begins around the 87C. If you really
> > > want a bypass open the bleed valve at the top of the t-stat housing.
> > >
> > > Dennis
> > >
> > >
> > >
> > > -----Original Message-----
> > > From: Vanagon Mailing List <vanagon@gerry.vanagon.com> On Behalf Of
> > > Dan
> > N
> > > Sent: Friday, April 23, 2021 12:07 PM
> > > To: vanagon@GERRY.VANAGON.COM
> > > Subject: Thermostat with a hole?
> > >
> > > hi all,
> > >
> > > I am planning to replace the thermostat on my tintop syncro 2.1 WBX.
> > > I will get an 80° thermostat.
> > >
> > > When researching the topic on thermostats I found that some of them
> > > have
> > a
> > > tiny hole on it (about 1/16" diam.) and some of them don't have.
> > >
> > > Is there a pro and con idea of having one with the 1/16" hole - or
> > > even drill one hole?
> > >
> > > thanks for your help,
> > >
> > > dan
> > >
> >
>
>