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Was looking on RockAuto for a t-stat for my Versa. They show two, a 205* and a 180*. Anyone know the correct one? Thanks
 

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Might want to go further and determine the year and running temp for that year, either WILL work but the engine software will be pointed at one of them and the wrong one can pop DTCs. A 180 in a car wanting 205 can easily post a DTC for not warming up fast enough to go to closed loop, ergo, a stat issue. Some cars will allow for it but some hold that difference very tightly.

Look at the OEM one, often they are marked if you look close enough.
 

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And THANK YOU pimperell for pointing out the Nissan confusion that adds even more to what we are discussing here. Or, a swift kick in the butt to wake me up............

When I referred to either one working I meant two different temperatures in the part 21230 there to the right, NOT 21200 to the left. As in different year models where they change the running temperature, they do it all the time. Not here.

Nissan gets even wonkier with it, using TWO stats, and adds to it by calling the one on the left the stat and the one on the right the 'water control valve' and thoroughly confusing.

The one on the right (water control valve) IS THE TRUE STAT there and anything approaching the other part name would be the one on the left in a normal universe. Look at the two running temps, the left one will be the lower 180 and the right will be the 200 or so temperature and the one the engine actually runs at. Why they add a stat on the entry side is anybody's guess, Ford runs the exact same coolant pathways on its' fours and uses nothing there at all, the engine cannot pull any coolant into an open hole there if the other side is blocked to stop all flow. Left pic is the entry and right pic is the exit, the exit is what always determines temperature of the engine.

At some point my intentions are to completely remove the stat on the left in my car to check out whether it still runs fine like a Ford, it should do it easily. Why? To remove a possible overheat cause for no reason if I am right, Nissan likely uses a valve there just to produce a slightly more intense temperature change to signal ECM to go to closed loop, it may well do it all day long without the stat in place. Eventually I'll see anyway.

I look at old stats going bad as a really stupid reason to possibly overheat a car to put it in the scrapyards and two stats just make that worse with double the possibilities. Even more so when the cars have run for 75 years fine with just one. Japanese complexity just for the sake of complexity and what the Japanese DNA leads to sometimes with not much real worth at all there.

Sorry for any confusion I added there folks, this should help straighten some of it out.
 
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