If Changan replaces antifreeze, 4 liters is enough, as long as the engine is not started.

Then the freezing point you mentioned can be used as long as it is not in the northeast and east, and green replacement can also be used.

In the replacement process, you can first remove the drain pipe of the water tank to release water, and then press the upper pipe to add water.

Have a nice trip! If there is something wrong with your car, ask the car mechanic. 4S shop professional technician, 10 minutes to solve.