How to Use Car's Internal and External Air Circulation?

[Teresa]

Usage of car's internal and external air circulation: The external circulation mainly serves the purpose of ventilation, so this function should be activated when the air inside the car becomes stale. During high-speed driving, if the car is sealed and only the internal circulation is used, it can easily lead to insufficient oxygen inside the car, which may cause driver fatigue, inability to concentrate, and pose potential safety hazards. Internal circulation means keeping the air circulating only within the car, with the blower driving the air inside the car to circulate. External circulation connects the inside of the car with the outside. While the car is moving, airflow will automatically be drawn into the car using wind pressure. When stationary, outside air can also enter the blower through the air ducts and then be blown into the car.