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Also most all cooling systems that i know of have a bypass, either external or internal. Usually they are always open. this allows the coolant to still circulate around in the engine resulting in a more uniform temperature across the whole engine, which aids efficiency and reduces wear on internal parts. Otherwise you would end up with certain spots much hotter then others, and who's to say the coolant where the Tstat is located would ever get hot enough to open before damage occurs somewhere else?
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