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an engine runs best when at a certain temp, which varies according to the engine and how its used. a thermostat helps regulate this temp. too hot, and engines fail, or over heat, too cold, and engines can build up excessive carbon in the cylanders, as it is not hot enough to burn out; and also affect climate controls.(a/c heater) when an engine reaches a certain temp, the thermostat opens, allowing coolant to fully circulate in the engine, keeping it at a constant temp

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Q: Why do engines need thermostats?
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