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Originally Posted by Grumpy old man
If your running a 180 thermostat and it gets hot at a light you have other issues like a clogged radiator or a worn water pump ,loose belts ,.
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Agree entirely!
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you need a thermostat in place to cool the engine and slow water flow between the engine and radiator ,fast flow can't pull off high heat in the engine
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Disagree entirely! There's no such thing as "too fast" to transfer heat, since the "too fast" coolant is "rushing away" to be replaced by even cooler coolant, and there is no time at which the metal is not in contact with the coolant, unless it cavitates.
So long as there is no cavitation, the fastest possible flow with the lowest possible viscosity will return the greatest cooling. But you don't need that speed for any practical purpose, and a thermostat doesn't slow things down much.
Short version of the story is that your engine should cool just fine with a 180 or 195 T-stat, and if it's running hotter than the T-stat set point, it's really got nothing to do with the T-stat so long as it's opening when it's supposed to.
I don't want to rat hole on the "too fast" coolant thing so am content to agree to disagree on it.