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A thermostat is a temperature regulator that controls the flow of coolant in internal combustion engines. It optimizes performance by enabling the engine to rapidly reach its ideal operating temperature and maintain it consistently. Operating Principle When the engine is cold, the thermostat remains closed, preventing coolant from flowing into the radiator. As the engine temperature reaches approximately 80–90 °C, the wax-like substance inside the thermostat expands, opening the valve. This dire