Keep the engine within the proper temperature range under all operating conditions. The cooling system must prevent the engine from overheating and also prevent the engine from being too cold in winter.
The cooling system can be divided into air cooling and water cooling according to different cooling media. If the heat of the high-temperature parts in the engine is directly dissipated into the atmosphere for cooling, it is called an air-cooled system. The device that transfers this heat to the cooling water first, and then dissipates it into the atmosphere for cooling is called a water cooling system. Because the water-cooling system cools evenly, the effect is good, and the engine noise is low, the water-cooling system is widely used in automobile engines at present.