Which air circulation mode should be used for defogging inside the car?
5 Answers
Using the air recirculation mode can defog the windshield faster. Here is a brief introduction to the recirculation and fresh air modes: 1. Recirculation mode: This mode is designed to prevent dust and odors from entering the car through the fresh air system by closing the external air intake duct, thereby blocking polluted outside air. 2. Fresh air mode: Since the car interior forms a relatively sealed environment, prolonged occupancy may lead to oxygen deprivation. Therefore, the air conditioning system includes an additional air duct to draw fresh air from outside, which then passes through the evaporator or heater core to deliver either cool or warm air.
When I encounter fogging inside the car, I always turn on the external circulation to defog first. Once while driving in the rain, the windows suddenly became foggy, almost obscuring the road. I quickly pressed the defog button on the center console—it usually has a fan-shaped icon. After activation, the car automatically switches to external circulation mode because the outside air is drier. Using internal circulation would trap moisture inside, making the fogging worse. The air conditioning also automatically dehumidifies, and both cold and warm air are effective. If there's no button, manually adjust the fan speed and temperature, then make sure the circulation mode is set to external. This is crucial for driving safety—address fogging immediately when visibility becomes blurry, don't delay. Regularly check if the air filter is clogged to keep the system running smoothly. This way, you can quickly handle fogging next time it happens.
I believe that turning on the external air circulation is necessary when there's fogging inside the car. Based on experience, fogging is mostly caused by accumulated moisture from exhaled breath or water seepage inside the car. Activating the external air circulation brings in dry air to dehumidify, and with the air conditioning blowing, the fog quickly dissipates. Using the internal air circulation is like closing the doors and windows, making it harder for the moisture to escape. Every time I encounter fog during long drives, I simply press the defogging button, which automatically switches to external air circulation while the air conditioning works to reduce humidity. No button? Just manually adjust the air circulation knob or button to the external circulation symbol. Keep the temperature neither too high nor too low, or the effect will be compromised. Handling such small issues properly makes the journey much safer. Remember to have the shop check the air conditioning system for leaks or malfunctions during maintenance.
I get nervous when the car fogs up and immediately turn on the external circulation. Fog obstructs visibility, posing a significant danger. Pressing the defog button or switching to external circulation mode to introduce dry air is the most effective way to dehumidify. Using internal circulation will only trap moisture and make it worse. Combining the air conditioner with dehumidification is key—simple actions can resolve the crisis.
Let me explain how to operate. When fog forms inside the car, turn on the air conditioning and press the external circulation button to draw in outside air for dehumidification. If you can't find the button, there's a mode selector on the center console that can be switched to external circulation. Simultaneously, press the defogging icon switch to let it work automatically, increase the fan speed, and adjust the temperature according to the season - cold air dehumidifies faster, but warm air also works in winter. This method is simple and practical, quickly clearing fog for better visibility, and is more convenient than using internal circulation. Don't ignore sources of humidity inside the car; regular ventilation helps prevent fogging.
