(1) According to the climatic environment, the antifreeze is classified into freezing points. Generally, the minimum temperature is 2-3℃ higher than the freezing point of the antifreeze. If the minimum temperature is -23℃, the antifreeze should be selected as the -25℃ antifreeze.
(2) Choose according to the vehicle condition. Some vehicle cooling systems require rust and corrosion protection, and antifreeze can be used; some vehicles require high-speed long-distance driving when the temperature is high in summer. If the coolant needs to be anti-boiling, antifreeze can be used. For these two purposes, the lowest grade antifreeze can be used, such as -25 ℃ is acceptable, some companies can also use -20 ℃.