[QUOTE][ less fluctuation in use as the thermostat didnt cycle open/closed as often and better temp control /QUOTE]

I wonder why you get less fluctuation with less open/close cycles? one big gulp of cold water,close,heat it up to HOT then open and take in another gulp!
some t stats have small hole/bypass to trickle water thru so it soften the cold rush or cold shock they call it.

im also curious why you have such a high temp in an ambient of 100 when I have never been over 195 in ambient of 95.
and anytime I ever had a car over heat the quik fix was a fast run down the road. why would you run hotter going fast with 100 deg air to cool your 200 deg radiator?

if a car doesn't settle at the t stat temp in decent temps I think it has other trouble.

oh, the stat always is in engine hot water.

 

Thanks !

 

[QUOTE=happythree;304991]The year I bought my H3 the temps from May to September was at least 100 every day. Luckily that year the temps stayed just about 105, usually they hit the teens for a couple of weeks at a time in south Texas. I think the temp climbs on the hwy because the engine is working so much harder to maintain the higher hwy speeds with our aerodynamics. Add big tires and a roof rack plus a couple people wanting a/c and you can see the added effect. It would be like towing a boat or driving up an incline the whole time so you are pouring a lot more heat into the engine.

Anyway, shock cooling is a concern but I think that since the thermostat is not an either all open or closed valve that the shock cooling probably would not be a factor. I think having the thermostat closer to the temp probe that this may have something to do with the more stable temperatures too.

 

when you say they had more stable temps,just how stable?. mine sits on 195 and never move 2 deg. how mucjh better do you want/need to be?
the stat looks like its more central in this block than any other I saw right up front or on one side of a v6/v8 and it is on the output of the engine feeding into the rad huh.
where does the new in line stat go?

 

Apologies in advance for cross-linking to a post on another site, but it is relevant to the discussion- How's this engine coolant temperature?

This should give you the backstory on this mod.

 

I could not find the link info.

I enjoy an ongoing discussion on a topic to bring out new information.
you will see that I read and comment/question most all comments made by others point by point.
when my points/questions are ignored I end my participation!
end

 

I dont know why, the link works for me. Google "h3 thermostat jegs 53260 housing".