How does Chinese Jie Jun replace frozen liquid nitrogen?

When replacing, turn off the engine to cool it, so as to avoid scalding the human body due to the high water temperature. Before discharging the coolant, put the temperature control button on the air conditioning control panel at the far right end, that is, the warm air end, so that the warm air control valve can be fully opened. Unscrew the nut of the coolant expansion tank (balance storage tank or water tank), loosen the hose clamp at the water pump port, pull out the coolant hose and discharge the coolant. Judging whether the cooling system needs cleaning according to the state of the coolant. If cleaning is needed, when the engine is idling, continuously add enough clean water or cleaning liquid from the coolant hose for cleaning until the discharged clean water is clean. Then tighten the expansion tank cover, and then start the engine until the fan runs for 2~3min. After the flameout, check the coolant level. Generally, the liquid level will drop and be replenished when necessary. Finally, it should be noted that the coolant is generally toxic, so if you accidentally come into contact with the coolant on your body, you should immediately rinse it off with clear water, and the remaining coolant should be sealed and preserved.