In order to avoid overheating the engine, the parts around the combustion chamber (cylinder liner, cylinder head, valve, etc.) must be properly cooled. In order to ensure the cooling effect, the automobile cooling system is generally composed of radiator, thermostat, water pump, cylinder block waterway, cylinder head waterway, fan and so on. The radiator is responsible for the cooling of circulating water, its water pipes and heat sinks are made of aluminum, aluminum water pipes made of flat shape, heat sink with corrugated, pay attention to heat dissipation performance, installation direction perpendicular to the direction of air flow, as far as possible to achieve small wind resistance, cooling efficiency is high. The coolant flows inside the radiator core and the air passes outside the radiator core. Hot coolant cools as it dissipates heat to the air, and cold air heats up by absorbing the heat from the coolant, so the radiator is a heat exchanger.