How to operate Hafei van to replace antifreeze? What should I do if I am angry?

1 Drain the water in the water tank (there is a water plug at the lower right of the water tank, so you can turn on the butterfly switch). 2 Open the driver's seat, loosen and remove the warm air hose under the thermostat, about thumb thickness (there is a black hose with a diameter of about 5 cm above) (deflate it to make the water flow out as soon as possible). 3 After draining water, tighten the water plug and start adding antifreeze until antifreeze flows out of the water pipe below the thermostat. 4 Connect the heating water pipe and tighten it. 5 Continue to add antifreeze until the water tank is full and the kettle is about half full. Start the engine until the water tank is definitely full, and tighten the water tank cover. Pay close attention to the water temperature at the beginning of exercise, and check whether the water tank is full when the car is cold the next morning. 7 antifreeze must choose brands and good quality.