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  View original topic: Protraining or Bentley right?
Navy_Flyer Mon Jun 18, 2012 11:14 am

Was perusing the Vanagon Protraining manual - noticed their diagram of the cooling system had the thermostat going in upside down (gasket first, spring/coil up) from what I just replaced. Bentley shows it going it spring/coil down with gasket on top. Which is correct? I am having cooling issues and am trying to eliminate every possibility.

hans j Mon Jun 18, 2012 12:23 pm

Pretty sure it's spring down like the Bentley says.

Tram Mon Jun 18, 2012 12:57 pm

I'm pretty sure it won't even fit spring up, so there is a pretty definitive answer.

Other VW FWD watercooleds had the t-stat installed "upside down". I can't remember if the Diesel did as well, but is it possible you're looking at an earlier Vanagon Diesel engine in the other book? What's the publication date?

MarkWard Tue Jun 19, 2012 6:47 am

ETKA shows it upside down. But those are drawings. Many VW thermostats are dual function. As the engine heats up, the thermostat closes the bypass and opens the main flow. The bypass is located on the end of the thermostat. When installing a thermostat for any engine, it is a good idea to have the tangs that hold it together positioned out of the flow of coolant. I recall you having a problem with the original thermostat getting hung on the flange. I wondered if it was installed backwards, but did not mention it.


Navy_Flyer Tue Jun 19, 2012 7:20 am

rsxsr wrote: ETKA shows it upside down. But those are drawings. Many VW thermostats are dual function. As the engine heats up, the thermostat closes the bypass and opens the main flow. The bypass is located on the end of the thermostat. When installing a thermostat for any engine, it is a good idea to have the tangs that hold it together positioned out of the flow of coolant. I recall you having a problem with the original thermostat getting hung on the flange. I wondered if it was installed backwards, but did not mention it.

[pic]

I installed the first thermostat the exact same way the old one that was in it came out - right side up (spring down/gasket on top) - opposite of the ETKA drawing. The interference was due to an oversized bottom plate on the new thermostat which would not allow it to open - it was a Stant I got from PepBoys. I switched to a Behr thermostat I got from NAPA and it fit fine.

hans j Tue Jun 19, 2012 7:34 am

rsxsr wrote:
[pic]

The drawings are nice but notoriously inaccurate. How that one is drawn won't even seal the thermostat housing, the seal doesn't contact the upper housing.

MarkWard Tue Jun 19, 2012 7:40 am

Unfortunately, I could not tell you exactly which way is correct. Have not done enough of them in my time to say. Because the original came out one way, that is not to say, that one was correct. Just saying, these vans have had a lot of hands on them in 25 years.

The cover looks very straight forward, while the base appears to have the bypass built into it. I don't have the parts in front of me, but I would guess that ETKA is drawn backwards. You should be able to see where the disc on the end of the thermostat seats whether it is in the cap or the base. I am actually suprised it will go together both ways. That is usually not the case. Sorry I can't be of more help.

Navy_Flyer Tue Jun 19, 2012 9:38 am

hans j wrote: rsxsr wrote:


The drawings are nice but notoriously inaccurate. How that one is drawn won't even seal the thermostat housing, the seal doesn't contact the upper housing.

Good catch - that's the only way it could seal, with the upper housing 'lip' against the o-ring. ETKA has to be wrong. Bentley is right.



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