There is hot air at the outlet of Beijing Hyundai Elantra air conditioner.

1, internal circulation and external circulation As the name implies, internal circulation means that air circulates in the car, and external circulation means that air is sucked into the car from the outside. When the air quality outside the car is poor or there is more dust, it is recommended to adopt internal circulation. Sometimes it follows other cars, and the exhaust gas is heavy. At this time, it would be much better to change to the internal circulation mode. 2. During the driving process or after the engine is started, because the default ventilation mode of the vehicle is external circulation, a large amount of hot air is blown in from the vent in the vehicle, which is normal because the heat generated by the engine is sucked into the vehicle. If you change the ventilation mode to internal circulation, you will find that there is almost no hot air. It's winter now. Generally, if it is not particularly cold, you can enjoy the warmth brought by engine heat by setting the ventilation mode to external circulation, setting the air volume to 1 and putting the temperature between cooling and heating.