How to Turn on the Car's External and Internal Air Circulation?
2 Answers
Method to turn on the car's external and internal air circulation: After turning on the ignition switch, press the corresponding circulation button to switch the air conditioning mode to internal or external circulation. Use internal circulation when the outside air quality is poor or heavily polluted. If you use internal circulation for a long time and cannot open the windows, periodically switch to external circulation to allow fresh air into the car. Avoid using internal circulation for extended periods to prevent stale and unhealthy air inside the car. External circulation uses a fan to draw outside air into the car, replenishing fresh air. Sometimes, you may feel airflow even when the fan is off, which is due to the external circulation setting. Internal circulation effectively blocks external dust and harmful gases from entering the car, such as when driving through smoke, dust, areas with strong odors, or in heavy traffic, preventing harmful exhaust from preceding vehicles. Another function of internal circulation is to maintain cabin temperature.
Switching between air recirculation and fresh air when using the car AC is quite simple. I often adjust this while driving. There's a button on the AC panel with a car and arrow icon – press it once to activate recirculation (light turns on), keeping interior air circulating; press again to turn off the light for fresh air mode, drawing outside air in. I always use recirculation in traffic jams or hazy weather to avoid exhaust fumes, while switching to fresh air on highways or clear days saves fuel and feels fresher. With automatic AC, pressing AUTO lets the system decide, but manual control feels more precise. Remember not to use recirculation too long to prevent window fogging – occasionally switching to fresh air is healthier. New car manuals include diagrams that make this clear.
