How to Use BMW's Internal and External Air Circulation?
2 Answers
BMW's internal and external air circulation usage is as follows: 1: Internal Circulation: Refers to the air blown by the blower circulating only inside the vehicle, somewhat similar to blowing an electric fan with the door closed. Since no external air is involved, internal circulation has the advantages of fuel efficiency and rapid cooling. However, for this very reason, the air inside the vehicle does not get refreshed. 2: External Circulation: The most notable feature of the car's external air circulation is its ability to maintain the freshness of the air inside the vehicle. This is because external circulation draws air from outside the vehicle and blows it inside. Due to this characteristic, the cooling effect of external circulation is not as pronounced.
As a mom, I've been driving my BMW to pick up my kids for three years, and every summer I have to deal with this before using the car. Pressing the button on the center console with the little car icon turns on the recirculation mode, which is great for traffic jams or passing through smelly areas. On highways or when the car feels stuffy, press it again to switch to fresh air mode, indicated by the little car icon with an outward-pointing arrow. When using the AC, just press AUTO and the car will automatically switch between modes based on air quality detection, with the current mode displayed on the dashboard. Cars with air purification are even more convenient—no need to lift a finger during hazy weather. I usually switch to fresh air mode two minutes before parking to let the AC system dry out the pipes and prevent mold.
