What are the symbols for external and internal air circulation in car air conditioning?
2 Answers
The internal circulation symbol is a circular arrow inside a car graphic; the external circulation symbol is an arrow entering the car from outside. Here is some introduction about internal and external circulation: Internal circulation: The function of internal circulation is to prevent dust and odors from being drawn into the car through external circulation. Therefore, a control system is set up to close the external circulation duct and block polluted air from outside the car. External circulation: Since the interior of the car forms a relatively sealed environment, people can easily suffer from oxygen deprivation over time. Therefore, the air conditioning system adds an additional duct to draw fresh air from outside the car, which then passes through the air conditioning evaporator or heater core to blow cold or warm air respectively.
The symbol for the car air conditioning's external circulation is an arrow pointing into the car or an icon of a small car with wind lines, indicating the intake of fresh air. The internal circulation is represented by a circular arrow inside the car or an icon of a closed cabin, meaning only the internal air is recirculated. I often use the internal circulation to quickly cool or heat the car, especially in summer when the air conditioning can lower the temperature within minutes, saving time and ensuring comfort. However, during long-distance driving, the external circulation can prevent stuffy air and dry eyes, enhancing alertness. In heavy traffic or areas with severe air pollution, switching to internal circulation protects health by keeping exhaust fumes out. The button is usually located in the center of the air conditioning control panel, and some cars have indicator lights to clearly show the current mode. Regularly cleaning the air conditioning filter is crucial to ensure smooth switching between internal and external circulation without affecting performance.
