Skoda Ming Rui doesn't turn on the air conditioner in winter, but it has hot air. Is there a problem?

After the air conditioning system is turned off, there is still wind blowing into the cab. This situation is caused by the external circulation of the vehicle. When the vehicle is equipped with external circulation, the wind is introduced from the outside, and the air inlet door of the air conditioner is always open. When the vehicle is running, the external wind will blow into the cab due to the air pressure difference. As the engine temperature rises, you can feel that it is warm air, and you just need to turn off the external circulation. This is a normal phenomenon.