Thermostat temps

[MikeB]

Originally Posted by body bolt

With a 180F tstat and the engine is running at 210F, how is the tstat regulating? It's wide open and out of the loop. And of course it allows the engine to reach operating temperature quicker because at less than 180F it's inhibiting the flow of coolant through the radiator until it opens. That's what it is for.

Franken is absolutely correct.

I agree. It's pretty straightforward. However, this particular t-stat may be sticking before it fully opens. Since it's the only thing that was changed prior to the problem, it needs to be tested in boiling water on the stove. If it doesn't open before the water starts bubbling, then it's not working as a 180 t-stat.