What are the symbols for external and internal air circulation in car air conditioning?
3 Answers
The internal circulation symbol is a circular arrow inside a car graphic; the external circulation symbol is an arrow pointing from outside the car into the car. Below is some introduction about internal and external circulation: 1. Internal circulation: The purpose of internal circulation is to prevent dust and odors from being drawn into the car through external circulation, so a control system is set up to close the external circulation air duct and block polluted air from outside the car. 2. External circulation: Since the interior of the car forms a relatively sealed environment, people can easily suffer from oxygen deprivation if they stay in this environment for a long time. Therefore, the air conditioning system adds an air duct to draw in fresh air from outside the car, which then passes through the air conditioning evaporator or heater core to blow out cold or warm air respectively.
I drive frequently, and the air recirculation mode button is easy to recognize. The symbol for the recirculation mode is usually a small car icon with a circular arrow inside, indicating that the air is circulating within the car to prevent external smoke and dust from entering. The fresh air mode typically shows an arrow pointing from outside into the car, meaning it brings in fresh air. I always recommend turning on the fresh air mode first when starting the car to eliminate odors, especially after parking for a long time, as the air inside can become stuffy—just press the button to ventilate. During traffic jams or on hazy days, I switch to recirculation mode to avoid inhaling exhaust fumes, and the illuminated icon indicates it's active. The button is located on the air conditioning panel, and some car models use different designs, such as arrow combinations or the "REC" label, but overall, it's intuitive and user-friendly. Don’t keep the recirculation mode on all the time to avoid oxygen deprivation; I occasionally switch modes to keep the air fresh. Mastering this feature is very convenient for daily driving and can even save a bit on fuel consumption.
As a car enthusiast who's new to research, I find the air circulation symbol designs quite straightforward. The external circulation shows an arrow pointing into the car, representing fresh outside air coming in. I often press it for ventilation during long drives, especially in suburban areas with good air quality. The internal circulation features an arrow circling inside a car icon, indicating air recirculation within the cabin - I use this during urban rush hours to avoid exhaust fumes. The button near the dashboard lights up to indicate the active mode. Initially I didn't understand, but got familiar after a few tries - the benefits are clear: using internal circulation protects cabin cleanliness during windy/sandy conditions, while external circulation provides ventilation similar to opening windows on hot afternoons. I recommend manual switching over automatic mode, as experimenting with these symbols helps quick mastery and improves comfort.
