There are three steps to completely replace antifreeze: 1. Before completely replacing the antifreeze, make a comprehensive inspection to see if there are any leaks and cracks in each pipeline. The key point is to check the five-way pipe, which is named after five joints connecting various parts. After the antifreeze flows through the five-way pipe, it is distributed to different parts of the car to play a role. If there is antifreeze leakage in this part, replace the water pipe or re-fix the connection according to the situation. 2. Drain the old antifreeze, and then clean the liquid channel with clear water. Add clear water to the antifreeze replenishment tank, then inject clear water into the tank to make the clear water continuously flow through the engine cooling system, and then idle for 3 to 5 minutes for water circulation. At first, the water from the water tank is a little pink. Continue to inject fresh water until the water is clean. Don't forget to remove the warm water pipe and clean the water in the warm water tank. 3. After replacing the new liquid with water for about 1 hour, add new antifreeze from the water pipe of the water tank (radiator), which is the method to make the antifreeze flow into the water tank quickly. Then, add another bucket of antifreeze into the antifreeze tank until the antifreeze tank is almost full, and drive for about 10 minutes. At this time, due to partial air, the liquid level of the cooling system drops, and then antifreeze is added until the MAXT mark of the storage tank is full.