How to Use the Car Air Conditioner's Internal and External Circulation?
2 Answers
Usage of the car air conditioner's internal and external circulation: 1. Press the internal circulation button to activate it, indicated by an arrow inside the car; 2. Press the external circulation button to activate it, indicated by an arrow coming directly from outside the car. Many manufacturers simplify the operation by not including separate internal or external circulation buttons, with most cars defaulting to either external or internal circulation when the air conditioner is turned on, leaving only one circulation button. Internal circulation treats the car as a closed unit for cooling and heating, without exchanging air with the outside. External circulation uses a fan to bring outside air into the car, allowing air exchange between the inside and outside. When driving in suburban areas or on highways where the outside air is fresh, external circulation can be selected.
When I first bought a car, I didn't quite understand the meaning of the air conditioning buttons either. The recirculation mode is a function that keeps the air inside the car circulating, preventing any outside odors from entering. It's especially useful when stuck in city traffic, passing by a landfill, or during smoggy conditions, as it helps avoid inhaling exhaust fumes or unpleasant smells. The fresh air mode, on the other hand, draws in outside air and is best used on highways or in rural areas with clean air, which can help keep you more alert. The button is usually located on the air conditioning control panel, with a car-shaped icon and an inward-pointing arrow indicating recirculation mode—just press it to toggle. However, don't be lazy; use the fresh air mode more often to ventilate the car. Keeping recirculation on for too long can make the air stuffy, and increased carbon dioxide levels can make you drowsy, which isn't safe. Also, remember to replace the cabin air filter regularly, as accumulated dust can worsen air quality. I often drive to and from work, and after switching modes a few times, it became a habit.
