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A Thermostat is a valve installed in the engine block. It regulates the engine temperature. The thermostat allows the heating coil to heat up first to have a more comfortable cabin during cold weather. Once a certain temperature is achieved, the thermostat will open up to assist the cooling system in the engine.

 The thermostat is a heat-operated valve that regulates coolant temperature. It does this by controlling coolant flow from the engine to the radiator. The thermostat is in the coolant passage between the cylinder head and the radiator. The valve in the thermostat opens and closes as the coolant temperature changes. When the engine is cold, the thermostat closes. As the engine warms up, the thermostat opens, which prevents or allows coolant to flow through the radiator. By closing the passage to the radiator when the engine is cold, the engine warms up more quickly. Engine heat stays in the engine instead of being carried to the radiator. This shortens warmup time, wastes less fuel, and reduces exhaust emissions, After the warmup, the thermostat keeps the engine running at a  higher temperature than it would without a thermostat. The higher the operating temperature improves engine efficiency and reduces exhaust emissions.