What are the symbols for the car air conditioner's internal and external circulation modes?
2 Answers
The symbol for the car air conditioner's internal circulation mode is a closed car interior with a circular arrow, while the external circulation symbol shows an open car with an external air arrow pointing into the vehicle. Here are the relevant explanations: 1. Internal circulation: Internal circulation allows the air inside the car to flow in a closed loop. 2. External circulation: External circulation brings outside air into the car. Compared to internal circulation, the main advantage of external circulation is maintaining fresh air inside the car (especially in areas with good outdoor air quality). This is because external circulation draws air from outside the vehicle via the blower. However, due to this feature, the cooling effect of external circulation is less noticeable.
To be honest, when I first started driving, I couldn't tell these two icons apart either. The recirculation symbol is a car with a curved arrow inside, meaning it blocks outside air and recirculates the air inside the car. The fresh air symbol shows an arrow coming from outside into the car, which is like opening a window for ventilation. You definitely want to use recirculation in traffic jams or tunnels to avoid sucking in exhaust fumes. But on highways or with many passengers, you should switch to fresh air mode to prevent window fogging and drowsiness. These two functions are quite important as they affect both cabin air quality and safety.
