Date: Sat, 24 Apr 2021 12:12:03 -0700
Reply-To: Dan N <dn92610@GMAIL.COM>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Dan N <dn92610@GMAIL.COM>
Subject: Re: Thermostat with a hole?
In-Reply-To: <CY4PR0801MB3731DF8B53F8C3708C06DD0CA0449@CY4PR0801MB3731.namprd08.prod.outlook.com>
Content-Type: text/plain; charset="UTF-8"
Except for the temperature the Behr and Mahle are identical, made in
Germany.
The Calorstat is quite different, shorter throw (lesser opening?), made in
France.
On Sat, Apr 24, 2021 at 11:30 AM Dennis Haynes <d23haynes57@hotmail.com>
wrote:
> The Mahle-Behr units I have here do not have a hole. The Facets do with
> the bobble pin. Now that Mahle-Behr has become one lets see what the future
> will hold. So far only once made a mistake of the Behr “service” made in
> China radiator with the round tube core.
>
>
>
> Dennis
>
>
>
>
>
> *From:* Dan N <dn92610@gmail.com>
> *Sent:* Saturday, April 24, 2021 2:05 PM
> *To:* Dennis Haynes <d23haynes57@hotmail.com>
> *Cc:* Vanagon Mailing List <vanagon@gerry.vanagon.com>
> *Subject:* Re: Thermostat with a hole?
>
>
>
> 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
> <https://na01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.thesamba.com%2Fvw%2Fforum%2Falbum_page.php%3Fpic_id%3D2171931&data=04%7C01%7C%7Ccb1dec06027b44bd89b608d9074b723b%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637548842880382134%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=2hzSRP9XOS604RpoxkKtRjyAA9oSo0qaT%2FM1BvbjdWM%3D&reserved=0>
>
>
>
> 80°C Behr
>
> https://www.thesamba.com/vw/forum/album_page.php?pic_id=2171930
> <https://na01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.thesamba.com%2Fvw%2Fforum%2Falbum_page.php%3Fpic_id%3D2171930&data=04%7C01%7C%7Ccb1dec06027b44bd89b608d9074b723b%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637548842880382134%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=xmMkxlt0qa0QSNc5m2zDtZ8SgEXN9YKmzlJNCjP4VX8%3D&reserved=0>
>
>
>
> 87°C Mahle
>
> https://www.thesamba.com/vw/forum/album_page.php?pic_id=2171929
> <https://na01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.thesamba.com%2Fvw%2Fforum%2Falbum_page.php%3Fpic_id%3D2171929&data=04%7C01%7C%7Ccb1dec06027b44bd89b608d9074b723b%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637548842880392129%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=BhaC%2BSTZWeya9p3J%2B7VSOym4c2BoDu1n3J1PsgiAjEI%3D&reserved=0>
>
>
>
> 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
> > >
> >
>
>
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