High Flow Thermostats

Seth G
Vintage-Vans Listings Manager
Vintage-Vans Listings Manager

Number of posts : 1897
Location : Anacortes, WA
Age : 44
Registration date : 2013-04-24

High Flow Thermostats

Post by Seth G on Sun Aug 06, 2017 1:25 pm

To preface(long, sorry), the van has had a 180F stat with an electric radiator fan switch that kicks the fan(16" puller) on @ 200F and off @ 185F. This has been the setup since I installed the new engine in the van, almost 2000 miles now daily driving. This setup has worked well, the van never overheats, even in hot weather idling in traffic, etc. But the fan has been running alot more since it has gotten hot out. And I get heat soak after shutdown if I don't crack the doghouse open when I exit after the engine is up to full temps.

I wanted to address the heat soak with a delay that keeps the fan running for a time after shutdown. I figured while I was at it, I would also replace the fan switch so the fan comes on sooner, in an attempt to keep it from getting as hot in the first place.

So I have a new switch coming that turns on at 185F and off at 170F. This required me to replace the 180F thermostat with a 160F b/c I don't want the fan and the thermostat fighting each other. But hopefully to work in harmony as they have been. Currently/previously the fan only comes on when sitting idling in hot weather or when idling for long periods of time when it is cooler out. While I was looking for a new stat I saw these "High Flow" type thermostats with larger openings, bleed-by mechanisms and larger stat motors. I figured what the heck I'll try one.

I got everything but the new fan switch this week and got it all installed yesterday. Btw, I installed the thermostat so that the openings on the head side are oriented to the left and right to further help flow b/c that's where the coolant is coming from on these small 6's.

Anyway, what I noticed was that, all things being the same except for the new thermostat, the engine took a lot longer to get up to 200 for the fan to kick in, and when the fan did kick in, it ran for a substantially shorter period to get it back to 185F and kick out. Like seconds versus a minute or much more. So these 'high flow' stats really do work. I should have the fan switch Monday and I'll get it in and see how it does running in the new range of 170-185F. FYI, there are several mfr of these high flow stats, the one I used was a Motorad #2000-160 "Made in Israel". It was $3 on Rock Auto, w/ a gasket and shipping it was $8 total.

The Blue Box

Number of posts : 14
Location : Bryan, TX
Registration date : 2016-12-08

Re: High Flow Thermostats

Post by The Blue Box on Sun Aug 06, 2017 9:31 pm

Im running a stock fan with a 14 inch pusher and just have it on all the time. So even when i shut it down it keeps running until it cools down enough. helps with heat soak.

Number of posts : 9810
Location : Ashburnham, MA
Age : 59
Registration date : 2012-09-22

Re: High Flow Thermostats

Post by vanny on Mon Aug 07, 2017 2:30 pm

Thanks for the info, Seth!!! And please let us know how it all works together once you get the new fan switch installed as well... Very Happy


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Re: High Flow Thermostats

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