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A thermostat is a temperature sensitive device used in a vehicle's cooling system to control the flow of coolant between the engine block and radiator. A thermostat is important for several reasons. 1. It helps allow the engine to operate at optimal fuel efficiency. 2. It allows the engine to reach optimum operating temperature quickly. When the engine is cold, the thermostat stays closed, allowing the engine to reach operating temperature quickly. Once the engine approaches a predetermined operating temperature (typically 180-220 degrees F.), the thermostat begins to open and allows coolant flow from the radiator to the engine.

Mainly it serves as an emission control device by allowing internal engine temperature to remain within normal operating ranges.

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