How to Use the Car's Internal Circulation?
3 Answers
Internal circulation blocks polluted air. There are three main uses for internal circulation: 1. Internal circulation helps maintain temperature. It keeps the car warm in winter and cool in summer. However, prolonged use of internal circulation can lead to increased carbon dioxide levels from passengers' exhalation, making the air stale. It's advisable to switch to external circulation every hour to refresh the air. 2. Internal circulation blocks pollutants. When activated, the airflow channel between the inside and outside of the car is closed. Without the fan, there is no airflow circulation. When the fan is turned on, it draws air from inside the car, creating an internal airflow loop. Essentially, internal circulation effectively prevents external dust and harmful gases, such as smog on hazy days or exhaust fumes from vehicles in heavy traffic, from entering the car. 3. When driving in urban areas, especially in congested traffic or tunnels, it's best to use internal circulation.
After driving for over 20 years, I've found the recirculation mode most convenient. While driving, when I see that button with the arrow-inside-car icon on the dashboard or center console, pressing it activates recirculation mode. This feature is perfect for city traffic jams - during rush hour for example - as it only circulates interior air after pressing, blocking out external exhaust fumes and dust to prevent coughing or discomfort. In summer heat, turning on recirculation with AC cools the car much faster since the system doesn't have to deal with hot outside air; but don't keep it on too long - I usually switch back to fresh air mode after 30 minutes to prevent CO2 buildup that causes drowsiness. Long-term use can also save some fuel. Occasionally during sandstorms or pollen season, I'll keep recirculation on the whole trip for health protection.
As a newbie learning to drive, I find the recirculation mode super easy to operate. Just locate the AC control panel—the icon usually shows an arrow inside a car silhouette—press it to light up, indicating activation. I use it most at red lights to prevent outside exhaust fumes from polluting the cabin air. Engaging recirculation with AC also helps speed up cooling/heating for quicker comfort. But remember to periodically switch back to fresh air mode (I do every ~15 mins) to avoid stuffiness. New owners: the button's typically near the steering wheel or center console—just one gentle press does the trick.
