The effect of antifreeze on the engine is not immediately apparent, because the protection of the engine by the antifreeze is long-term. But as time goes by, you will slowly discover its effects. The most obvious is the leakage at the water pipe joint, the rubber water pipe has a slight crack, and there are traces of corrosion inside the water pipe, which will cause the water tank to corrode and leak. Therefore, the antifreeze must be replaced in time.