How to Use the Internal and External Air Circulation in a Car?
2 Answers
Here are the methods for using the internal and external air circulation in a car: 1. Airflow: External circulation exchanges fresh air from outside the car to the inside, while internal circulation cuts off the airflow between the inside and outside of the car. Without turning on the fan, there will be no airflow inside the car. 2. Pay attention to air circulation when driving in the city, where the outside air quality is poor. At this time, turn on the internal circulation to prevent outside air from entering and causing pollution inside the car. 3. Temperature adjustment: To quickly warm up the car in winter or cool it down in summer, turn on the internal circulation to speed up the temperature regulation inside the car. 4. Circulation time: If the internal circulation is on for too long, switch to external circulation to allow fresh air to flow in. 5. Usage during rainy days: On rainy days, the windshield may fog up due to temperature differences inside and outside the car. When the humidity inside the car is high, turning on the external circulation can quickly clear the fog.
When I first started learning to drive, I was completely confused about the recirculation and fresh air modes. Later, I figured out how to use them, and it turned out to be quite simple. The button with a car icon and an arrow inside the car represents recirculation mode. When activated, the air circulates only within the car, keeping outside odors out and cooling the car faster with the AC on. The button with an arrow pointing from outside into the car is the fresh air mode, which draws in outside air, ideal for ventilation and preventing window fogging. While driving, if there’s heavy pollution or traffic, I switch to recirculation to avoid bad air. On highways or when the air is clean, I use fresh air mode to ventilate. The button is usually on the AC panel, toggled with a single press—don’t keep recirculation on too long, as it can make the cabin stuffy and reduce oxygen, making you drowsy. My habit is to start with fresh air mode to circulate air, then adjust as needed after a few minutes. Use fresh air to prevent fogging on rainy days and recirculation for quick cooling in summer. In short, use them flexibly based on conditions, and remember to switch off occasionally to let the air refresh.
