How to deflate Chang 'an van when changing antifreeze?

Open the lid of the water tank to vent, which needs professionals to do. Now it is natural to vent through natural driving, but it is unlikely to vent like this.

If there is air in the antifreeze when it is added, it will overflow once the temperature of the car is together. Once it overflows, it will be short of antifreeze. At this time, the waiting car can't run far, and antifreeze needs to be added. If it is added repeatedly, it is not only troublesome but also dangerous.

Extended data

The function of automobile antifreeze has the functions of high boiling point, anti-icing, anti-rust and anti-fouling. Use purified water instead of antifreeze, and add a little alcohol to purified water in winter to prevent freezing. However, taxis are usually on day shift and night shift, so there is no phenomenon of water tank freezing. Although this saves a little money, there will be scale and rust in the water tank after a long time, and alcohol will also have a certain corrosive effect.

Antifreeze must be replaced regularly, because antifreeze also has a shelf life. Many drivers think antifreeze is long-lasting. It would be nice if you added less. It doesn't need to be replaced at all. In fact, with the passage of time, the various functions of antifreeze will gradually decay, and it can no longer play its original performance.