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What is the function of thermostat in cooling system of an engine ?

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What is the function of thermostat in cooling system of an engine ?

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Measuring the water temp and if the is cold (less than 80 c) it working as input for controller to prevent water from circulation throw cooling system....to improve thermal efficiency

Edited by Ahmed Goudǻ

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Thermostat opens at a pre-set temperature. Once the circulating cooling liquid departs the engine it will go through the thermostat first. If its (cooling fluid that departs the engine) temperature is below the pre-set temperature of the the thermostat it wont go through the cooler but rather would go back to the engine hence cooling the engine. Otherwise, the circulating cooling liquid would go through the cooler once its temperature is above the pre-set temperature of the thermostat. The overheated liquid would open the thermostat and enter the cooler back to to the jackets of the engine. Hence, brings down the temperature of the circulating cooling liquid at the desired range of thermal expansion of the engine. 

Edited by Mal

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Keeping operating temp of the engine at optimum conditions by restricting flow of colant into the cooler/ radiator when temp is low and or allowing flow if temp is too high.it is regulates colant temp

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Regulate the flow of coolant to maintain the required temperature through monitoring of temperature with some device and enhancing or decreasing the circulation 

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Typically, the cooling system (external to the engine) is sized for a worst-case set of conditions (maximum engine heat rejection, highest ambient temperature, etc.).  When conditions are off-design, the cooling capacity must be modulated to maintain the internal components at acceptable temperatures.  The thermostat works in concert with variable fan speed or shutters over the radiator opening to achieve the correct amount of cooling at a given operating condition.

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