In winter, there is a cold wind blowing under the front seat. What happened?

In winter, under the front seat is the air conditioning outlet.

According to the technical terms in the industry, this is the air outlet of the rear air conditioner, mainly to let the air in the car circulate. With these two air outlets, the cold air in the car can be circulated, so that the rear passengers can also enjoy the refrigeration effect brought by the air conditioning compressor. If it is in winter, the impact is really small, but it is obvious in summer, because the temperature rises in summer, and the hot weather makes most car owners choose to turn on the air conditioner inside the car to cool down. If the car is equipped with these two air outlets, the cold air in the car can circulate, and the rear space and the front space of the car share a compressor.