Electromagnetic Fan Clutch is a energy-conserving product of automobile cooling system.It can automatically start and stop the fan according to the high-low water temperature of automobile engine,which can make the automobile engine operating under the best temperature all the time,as well as it has energy-saving advantages,so it is the revolutionary device of automobile cooling system.The product can be used in heavy truck,coach and city bus.      The advantages of Electromagnetic Fan Clutch is annual stable operating temperature of engine make the engine isn’t too cold,can reduce the engine wear,reduce the maintenance costs and extend lifespan of engine,own much higer cooling efficiency than viscous drive,can reduce the dissipative fuel by cooling(save 3%～5% in summer,save 6%～8% in winter)，acquire the best efficiency by precise fan control,reduce the exhaust emission,can improve heat 10～15℃,increase heat output by high preheating temperature,and reduce the noice efficiently.