1, open the liquid filling port first? Open the drain valve again, drain the antifreeze (generally under the water tank), then add the antifreeze, and tighten it after the drain valve starts to flow out new antifreeze. When the antifreeze kettle is added to the scale line, start the engine, and the antifreeze liquid level will slowly drop, and it can be added until it is stable. Check the next day? Continue to the tick mark.
2. Circular method? Professionals do it. return pipe takes it apart, adds the engine to the kettle, and circulates the old antifreeze with new antifreeze until the new antifreeze in return pipe flows out. The color can be seen.