Which air circulation mode to use when driving in snow?
1 Answers
When driving in snow, use the internal air circulation to maintain warmth inside the vehicle. Switch to external air circulation when fresh air is needed. Internal vs. external air circulation in cars: When driving in urban areas, the car interior is often filled with the smell of exhaust fumes. Even when driving in open areas or on highways, you may sometimes feel dizzy or experience chest tightness. The main reason for this is the incorrect use of internal and external air circulation while driving. Principles of internal and external air circulation: External circulation - brings in fresh air, while internal circulation - blocks out polluted air. In external circulation mode, a fan draws air from outside the vehicle into the cabin, meaning there's an open air passage between the outside and inside. The air blown by the fan comes from outside, and even when the fan is off, airflow is still drawn into the cabin as the vehicle moves, replenishing fresh air. Sometimes you may notice airflow even when the fan is off - this is because external circulation is active. During city driving in heavy traffic, the cabin may fill with exhaust fumes due to external circulation being used. Internal circulation mode closes the airflow passage between the inside and outside of the vehicle. Without the fan running, there's no airflow circulation, and when the fan is on, the airflow comes only from inside the cabin, creating internal air circulation. Internal circulation primarily serves to effectively prevent external dust and harmful gases from entering the cabin, such as when driving through smoke, dust, areas with strong odors, or in dense traffic where it blocks harmful exhaust from vehicles ahead. Another function is to help maintain cabin temperature.
