Does the water tank of a car without refrigerant need to be drained in zero-temperature weather?

If there is water in the car water tank, it must be drained when the temperature is zero.

This is because the process of freezing and swelling of water channels in the water tank occurs in the temperature range of 0 to 4°C. At the temperature of 0 to 4°C, because water is transforming into ice crystals, the volume is abnormal. The phenomenon of thermal contraction and cold expansion occurs. With the solidification process, it begins to expand, causing the water tank or closed water pipe, or the water channel in the engine block to expand and crack.

Therefore, when the temperature reaches 0°C, the water must be drained in time and the antifreeze coolant must be replaced. The use of antifreeze coolant is not only to prevent freezing, but also to improve the engine cooling effect and protect the water pump and water channels.