How it works:-This is a basic diagram of a conventional water cooling system. These system based on radiator, upper and lower hose pipe, cooling fan, water pump, thermostat valve, water jacket and several parts.Basically the hot water pass through by thermostat valve and goes to the upper tank of the radiator.The cooling fan blow cold wind and the water of radiator becomes cold and then it pass through to the water jacket by water pump.Then engine become cold by cold water. Thats how it works.
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From @nahid05