Cooling issue, but this time it's to cold...

Doen't some get thru by design? So the bypass only circulates thru the motor.
Makes sense what you two are saying, however I think and I could be wrong, once we are talking about a hot open system, doesn't that sorta negate that?
On the other hand it should close off to keep the temp up but do you think once it's hot in the engine that the stat would ever really close fully again while running? I have never seen any engine run this cold even thru the years a couple times I had motors will no t-sat at all, going by that those got plenty hot so how could a little bypass in mine cause a 50 degree drop?
Don't take this as I'm arguing, I'm not, I'm just trying to get a mindset of how this could be happening, thanks.