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I think the part you are missing is that a thermostat does not just run fully open, it's the device that actually controls your coolant flow and engine temperature. Otherwise, in winter our engines would never get up to operating temperature. If they operated as you state, with the heat input and cooling capacity in equilibrium, the temps. would be all over the place with varying engine load (heat input), and ambient temperature (cooling capacity). If a car wasn't designed with excess cooling capacity, it would overheat any time conditions aren't ideal.
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