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Your engine's cooling system is essential in regulating heat in your engine. The engine cooling system sends coolant through the passages in the engine block and cylinder head, picks up excess heat from the engine, and carries the hot coolant through hoses to the radiator. The hot coolant is pushed through the radiator core where it is cooled by the engine driven fan as well as the air flow through the grille of the vehicle before it is returned to the engine to absorb more heat. This system requires multiple components including a water pump to maintain the flow of coolant through the engine, the radiator which transfers the hot coolant into coolant suitable for recirculation through the engine, fans to cool the coolant as it flows through the radiator, hoses to carry the coolant, and a thermostat to make sure the coolant stays above a certain temperature before allowing it through the radiator. Engine coolant needs to withstand extreme temperatures without freezing or boiling. The components of the cooling system keep the coolant from boiling while antifreeze prevents freezing. Be sure to flush and refill the coolant periodically.