【Little Sister Lecture】When running at high speed, does the air conditioner need to open the external circulation?

With the improvement of people's living standards, many people have begun to enjoy material things. Buying a car is now the mainstream way of consumption, people with cars do not have to be exposed to the hot sun in the summer, and they can also blow air conditioning in the car in the winter to keep warm. When we drive, we will turn on the air conditioner, and after a long time, it will cause the problem of increased fuel consumption.