1. If the engine is overheated due to insufficient cooling water, the electronic fan is required to continuously dissipate heat.
2. Engine overheating caused by water tank leakage, water leakage caused by loose or damaged hose, and electronic fan running continuously.
3. Due to the temperature controller, water can't be sent to the water tank when the temperature reaches the base Huai temperature, so a fan is needed to dissipate heat.