When the chemical energy is converting to mechanical energy, 70% of the energy of the gas is converted to heat. The function of auto cooling system is to dissipate this heat which is able to provide the warmth of two ordinary houses. By preventing the engine overheating, auto cooling system achieves the cooling effect. Actually, the auto engine has a best performance under suitable high temperature. Because it's to accelerate the wear of components and reduce the efficiency of engine when the engine is at the low temperature. Therefore, the other job of auto cooling system is to heat the engine within a certain range and to maintain constant temperature.
 
Typically, the auto cooling system consists of radiator, thermostat, pump, channel, fan etc. The radiator is responsible for cooling circulating water. To limit the affect of weight on the performance of engine, many auto elements equipped with the cooling system are made to be lighter. Now auto radiator is made up of aluminum material. Aluminum radiator is welcomed by many manufacturers due to the feature of light weight. More and more racing radiators are designed with the lighter weight for the pursuit of high speed. The cooling of engine is achieved by the circulation of cooling liquid in the pump, which is driven by belt from engine crankshaft. The different circulations are adjusted by the thermostat based on the working conditions of engine. Fan is mounted at the rear of radiator for forced ventilation and thus improves the cooling capability.
 
Now let's talk about the working principle of cooling system. Generally, the cooling effect is allowed by the help of auto cooling system to provide a suitable temperature and thus to ensure that the engine is working normally. When the engine runs, the water pump rotates to increase the pressure of cooling liquid and thus to generate the circulation of water. The circulating water takes away the heat from cylinder body, cylinder jacket and cylinder cover. If the temperature of cooling liquid is below the control temperature of thermostat, the cooling liquid will enter the cylinder through circulation tube. With avoiding unnecessary cooling the temperature of cooling is increasing quickly. When the control temperature of thermostat is reached, the valve of thermostat will turn off bypass water channel of small circulating tube. At that moment, the cooling liquid passes through thermostat into water ventricle of radiator. The hot water flows down through the radiator core cooled by the air flow passing through the fan and loses some heat. Finally the cooled liquid flows into the lower water chamber of radiator.