Open the front hood. There is a small water pipe under the roof of the car. Remove it. Add water to the water tank and start the engine idling at half an hour. If you continue to add water, you must add it slowly. The water pipe comes out, connect the thin pipe and fill the water tank. Wait for the electronic fan to turn off the flame and wait for the water temperature to come down to see if it is full of water. Also, be careful not to forget the spare kettle.
The reason for the emptying is that the engine is cooled by water. If there is air in it, the cooling water will be reduced in the water channel, causing poor heat dissipation. So it must be exhausted until there is no air.