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Yes I am sure of my statement. Yes you are right that themostat stays closed while engine warms up quicker then partly open to have coolant flow through to cool it down, keeping temperature at it should be.
Water flow too fast through the radiator, not giving enough time for it to cool down in radiator can cause overheating.
Other example I noticed with my 4runner, when in very cold morning driving downhill on a freeway at 100kmh, I applied no power from engine. the temperature gor really cold, the needle went right back to the C mark. If themostat is working, it should close again when coolant gets cold so engine can stay warm. U get what I am saying?
So themostat is to help engine warm up quicker and to keep the engine at designed temp range.
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