Which Button is for the External Air Circulation?

[ElijahLynn]

It is a car symbol with an arrow pointing from the outside into the car, which represents the external air circulation button. When the vehicle's air conditioning or heating system is activated, using the external air circulation allows outside air to enter the car, providing ventilation. External Air Circulation: In the external air circulation mode, a fan draws air from outside the vehicle into the interior, meaning the air passage between the outside and inside of the car is open. The air blown by the fan comes from outside, and even if the fan is not turned on, airflow is still drawn into the car while driving, replenishing fresh air inside the vehicle. Function of External Air Circulation: When the air inside the car is stale, using the external air circulation allows fresh air to enter, effectively improving the air quality inside the vehicle. This is especially useful for new cars, as it helps eliminate odors. In rainy weather, using the external air circulation prevents fogging on the windshield and other windows, enhancing driving safety.

[OAustin]

I've been driving for several years, and the external air circulation button is actually quite common. It's located on the car's air conditioning panel, usually marked with a small car icon and an outward-pointing arrow, indicating the intake of fresh air from outside the vehicle. I typically use it when the air quality is good, such as on highways or in rural areas, to allow fresh air in, improve the cabin environment, and prevent stuffiness or window fogging. On some car models, this button is also labeled '外循环' (external circulation) or 'OUT,' and its position may be in the central console area near the steering wheel. When air pollution is severe, I switch to internal circulation to avoid harmful substances entering the cabin. The operation is simple—press the button, and when the light turns on, it's activated. The fan speed may adjust automatically. Regularly cleaning the air conditioning filter can also enhance the effectiveness of external circulation; otherwise, blockages can affect airflow. It's recommended to check the air conditioning system every six months to maintain efficient operation.

[VanAxel]

I understand the design principles of car air conditioning. The external circulation button is part of the air conditioning system, commonly located on the left or center of the control panel, with an icon depicting a car and an outward arrow. Toggling it allows outside air to enter the cabin, unlike the recirculation mode which reuses the interior air. I often use the external circulation mode while driving to reduce CO2 concentration inside the car, preventing drowsiness or odors, especially in urban traffic jams. This function works better when combined with the recirculation mode—for example, activating recirculation first during smoggy days and switching appropriately later. The button requires a light press to activate, with the air conditioning display light changing accordingly. The filter's effectiveness is crucial as it blocks pollen and dust from entering. Maintaining proper button functionality also extends the compressor's lifespan and minimizes fuel consumption impact. I recommend car owners regularly check the filter's condition to ensure the system operates efficiently.

[BrookeLee]

When I first started driving, I was also confused about where the external circulation button was. Later, I found it in the air conditioning control area, with an arrow pointing outward on the button. Pressing it allows the car to draw in fresh air from outside, unlike the internal circulation mode which just recirculates the air inside. I usually press it when the car feels stuffy, as it quickly ventilates and removes odors. It's very convenient to operate—just press the button without any complicated settings. The airflow might change slightly, but it doesn't affect driving. This mode is especially useful on highways where opening windows isn't practical. Remember to use external circulation frequently when there are many passengers to keep the air fresh and avoid health issues.

[MacColeman]

Through my driving practice, I've come to recognize the importance of the external air circulation system. Its button is typically located on the climate control panel, marked with an outward-pointing arrow icon. Pressing it introduces fresh outside air, which helps reduce bacterial buildup and pollutant accumulation inside the vehicle - especially useful when passengers are smoking or have colds to prevent cross-infection. I frequently use this function during mornings with good air quality or in well-ventilated environments. The operation is simple with just one-button switching, and the AC system automatically optimizes airflow output. The internal recirculation mode is better suited for areas with severe external pollution, though prolonged use should be avoided to prevent oxygen deprivation. Button placement may vary by vehicle model, sometimes found on the right side of the steering wheel or within touchscreen menu options. Maintaining clean cabin air filters remains one of the key measures to enhance external circulation effectiveness.