How to Use Car's Internal and External Air Circulation?
2 Answers
Correct usage of car's internal and external air circulation: Use internal circulation in traffic jams and external circulation on highways. The use of internal and external circulation should be combined with air conditioning and heating. Below are detailed explanations of internal and external circulation: 1. The car's fan has two operating modes: external circulation and internal circulation, which can be switched using a toggle switch. 2. External circulation mode uses the fan to draw air from outside the car into the interior, meaning there is airflow between the outside and inside of the car. The air blown by the fan comes from outside, and even if the fan is off, airflow is still drawn into the car while driving, replenishing fresh air inside. When driving in the city and encountering traffic congestion, the car interior can fill with exhaust fumes. 3. Internal circulation mode closes the airflow passage between the inside and outside of the car. Without the fan, there is no airflow circulation, and when the fan is on, the airflow drawn in comes only from inside the car, creating internal airflow circulation. Internal circulation mainly prevents external dust and harmful gases from entering the car, such as when driving through smoke, dust, areas with strong odors, or in heavy traffic, blocking harmful exhaust from vehicles ahead. Another function is to maintain interior temperature.
As someone who frequently drives long distances, I'm quite familiar with using the air recirculation mode. The operation is actually very simple. Most cars have a button on the climate control panel with an icon resembling a circular arrow or showing separation between inside and outside of the car - pressing it toggles between recirculation and fresh air modes. Personally, I prefer using recirculation mode during traffic jams to prevent external exhaust fumes and dust from entering, such as when driving in the city during rush hour. Switching to recirculation allows the cabin air to circulate internally, improving comfort. When driving on highways or in areas with fresh outdoor air, I press the fresh air button to allow clean air circulation and prevent stuffiness in the cabin. It's important to note that you shouldn't keep recirculation mode on continuously, as CO2 buildup may cause fatigue. Additionally, combining it with temperature adjustment works better: first use recirculation for quick cooling, then switch to fresh air to maintain balance. I've also found that regularly cleaning the cabin air filter improves the efficiency of both modes, especially during allergy seasons. In summary, flexible use of this small feature can significantly enhance driving comfort and health.
