Will Dust Enter When Using the External Air Circulation?

[MacKendra]

Dust can enter when using the external air circulation. The reasons for dust entering in external air circulation mode and how it works are as follows: Reasons for dust entering in external air circulation mode: Because the external air circulation mode uses a fan to draw outside air into the vehicle, meaning there is an open air passage between the outside and inside of the car. When driving on dusty roads or during windy weather, dust stirred up by the wind can easily enter the vehicle through the external air circulation, increasing the amount of dust inside. How external air circulation works: The external air circulation works by using a fan to bring outside air into the vehicle and expel the inside air out through the fan, achieving ventilation without opening the windows.

[LaKyle]

I've been driving for over twenty years, and regarding the issue of dust entering through the external air circulation, I must say, yes, it does bring in dust because the external circulation mode draws air from outside the vehicle for ventilation or cooling. In dusty areas, such as rural dirt roads or construction zones, the incoming air carries visible particles, naturally causing dust to accumulate inside the car. However, there's no need to panic. Modern cars are equipped with cabin air filters—those small filter screens—that trap larger dust particles and protect your respiratory system. I often remind people not to neglect replacing these filters. On average, they should be replaced every year or after driving about 15,000 kilometers; otherwise, dust buildup can clog the vents. Additionally, in heavily polluted cities or during hazy weather, I usually switch to internal circulation to reduce the inflow of external air, switching back to external circulation when conditions improve to maintain fresh air inside. In short, a little dust is inevitable, but it can be easily managed with simple maintenance.

[GarrettLee]

As a car enthusiast, I've studied how the air conditioning system works. When the external circulation is on, the fan draws in air from outside through the intake vent, which inevitably brings in dust, especially when the outside air quality is poor, such as on windy days or in areas with many trucks on highways. The filter plays a crucial role; it acts like a sieve, trapping particles to prevent them from entering the cabin. However, this filter isn't foolproof. If it's old or dirty, its effectiveness drops significantly, allowing dust to seep through. I recommend checking the filter's condition regularly, typically replacing it every 6 to 12 months. During daily driving, in sandstorms or industrial areas, switch to internal circulation more often to avoid inhaling too many pollutants. Filter maintenance is key—it helps keep the cabin air relatively clean and maintains comfort. Don't underestimate this; it can greatly reduce the buildup of unpleasant odors inside the car.

[VonEmmett]

When driving in the city, I often encounter issues with using the external air circulation. Yes, it lets in dust, especially in congested areas with heavy exhaust fumes. The sources of dust include road dirt and air pollution; without a filter screen covering the car's air intake, dust easily drifts in. My personal habit is to use the internal circulation more in heavily polluted areas to reduce external dust. For regular maintenance, I check the cabin air filter every six months and replace the old one—that usually takes care of it. Just don't let dust affect your driving comfort.