What does the car air conditioning recirculation mode mean?
2 Answers
Car air conditioning recirculation mode refers to closing the airflow passage between the inside and outside of the vehicle, preventing outside air from entering the cabin and only circulating the existing air inside the car. The primary purpose of recirculation is to effectively block external dust and harmful gases from entering the vehicle, such as when driving through areas with smoke, dust, unpleasant odors, or in heavy traffic where it prevents harmful exhaust emissions from preceding vehicles. Another function is to maintain cabin temperature. Precautions for using car recirculation mode: During the first 6 months of a new car, ensure enhanced ventilation, regularly clean the car's air conditioning system, strive to maintain fresh air inside the cabin, and particularly avoid using perfumes or air fresheners to mask unusual odors in the vehicle.
I haven’t been driving for long, and I’m quite curious about this recirculation mode. Simply put, it means the AC only circulates the air inside the car, without drawing in outside dust, odors, or smoke. For example, when I’m in the city and encounter smoggy weather, I turn on this mode and immediately feel the air inside the car is much cleaner. At traffic lights, when the exhaust fumes outside are heavy, using recirculation protects my health. But don’t keep it on all the time, or the air inside will get stuffy and hot, making you drowsy. I often switch between recirculation and fresh air mode: fresh air mode draws in outside air, which is great for rural areas with clean air, while recirculation is better for polluted areas. Remember to clean the AC filter regularly—otherwise, recirculation won’t work well. This is something I check often. Using recirculation for a few minutes before driving to preheat or precool the AC is also very efficient.
