What Are the External and Internal Air Circulation Modes in Cars?
2 Answers
External air circulation in cars refers to: when the car's air conditioning system is turned on and connected to the outside air, it draws in air from outside the vehicle for circulation. Internal air circulation refers to: when the air conditioning system is turned off from external air intake, it can only use the air inside the vehicle for circulation. The icon for external air circulation is a car with an unenclosed arrow pointing from outside into the car, and its function is to replenish fresh air and improve the air quality inside the vehicle. The icon for internal air circulation is an enclosed car with a circular arrow inside, and its function is to promptly prevent external dust and harmful gases from entering the car. The usage methods for external and internal air circulation are: use external circulation on highways, and use internal circulation in traffic jams.
Hey, I've been driving for years and often get asked about the difference between recirculation and fresh air modes. Simply put, recirculation mode keeps the cabin air circulating within the system, blocking outside pollutants - perfect for highway driving to avoid exhaust fumes or keeping air clean during sandstorms. Fresh air mode is like cracking a window, bringing in outside air. It's great for quickly defogging your windshield on rainy or foggy days, making driving much safer. My routine is using fresh air mode upon winter startup to ventilate, then switching to recirculation in summer traffic for cooler air and better fuel efficiency. Remember to change your cabin air filter regularly - poor filtration ruins air quality, especially when driving kids. Mastering these modes boosts comfort, and don't overlook them during smoke or pollen seasons if you're allergy-prone.
