The radiator belongs to the automobile cooling system. The radiator in the engine water cooling system is composed of three parts: the water inlet chamber, the water outlet chamber, the main fin and the radiator core. Principle: In order to avoid overheating of 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 generally consists of a radiator, a thermostat, a water pump, a cylinder water channel, a cylinder head water channel, and a fan. The radiator is responsible for the cooling of the circulating water. Its water pipes and radiating fins are mostly made of aluminum. The aluminum water pipes are made of flat shape and the radiating fins are corrugated. Pay attention to the heat dissipation performance. The installation direction is perpendicular to the direction of air flow. The wind resistance should be small and the cooling efficiency should be high. The coolant flows in the radiator core, and the air passes outside the radiator core. The hot coolant becomes cold by dissipating heat to the air, and the cold air heats up by absorbing the heat from the coolant, so the radiator is a heat exchanger.