How to Turn on the External Air Circulation in a Mercedes-Benz?
2 Answers
Method to activate external air circulation in Mercedes-Benz: First press the internal circulation button - the illuminated indicator signifies internal circulation. External circulation is engaged only when the indicator turns off. Therefore, the external circulation function shares the same button as internal circulation, which serves multiple purposes: 1. Briefly press the internal circulation button (indicator illuminates) to activate internal circulation; 2. Briefly press it again (indicator turns off) to switch to external circulation; 3. Long-press the button to automatically close/open all windows - particularly useful when encountering sudden smoke, dust, or polluted road conditions while driving with windows open. After enabling external circulation, the air intake located at the firewall is opened by the climate control system. The blower then draws outside air through the microfilters into the evaporator's dual heat exchangers. Conditioned air is subsequently discharged through the vents. Note: Certain Mercedes models automatically revert to external circulation after 5-10 minutes of forced internal circulation to maintain air quality and sufficient oxygen levels, explaining why outside air may still enter during internal circulation mode.
I've been driving a Mercedes for several years now. To activate the exterior air circulation, you simply press the button on the climate control panel with the car icon and outward-pointing arrow - it's a one-touch switch to bring in outside air. Mercedes' climate system is designed with great ergonomics. Whenever the cabin feels stuffy or poorly ventilated while driving, pressing this button immediately brings in fresh air for an instant refresh. I prefer using exterior circulation in urban areas with good air quality - it provides rapid air exchange and comfort, while also helping prevent fatigue during long drives. Remember to replace the cabin air filter regularly, otherwise it may accumulate dust and compromise air quality. The operation is straightforward with clearly positioned, uncomplicated buttons. Mercedes' interface responds quickly, and when paired with automatic mode for adjusting fan speed and temperature, everything works seamlessly. This small feature proves highly useful in daily driving, especially for effective defogging and odor elimination, while also enhancing safety.
