The car also needs to use cooling fan. The cooling fan will not run when it is just started. Generally, the temperature is above 90 degrees. There is a temperature control switch on the water tank. When the water temperature rises to the set value, the fan will start to work, operate at high speed and force heat dissipation. When the water temperature is lower than 85 ℃, the fan will stop running. The main function of the fan is to heat and cool down. When the temperature is higher, the fan will turn on The longer the time, the cooling fan is mainly to protect the engine.