What is the function of the car's internal and external circulation?
2 Answers
The main function of the car's internal circulation is to block polluted air, prevent external gases from entering the car, and ensure clean air inside the car without airflow circulation. The following are precautions for using the car's internal circulation: 1. After purchasing a new car: Maintain air circulation inside and outside the car to allow harmful gases inside the car to be released as soon as possible. 2. During the first 6 months of using a new car: Be sure to enhance ventilation, regularly clean the car's air conditioning, and try to keep the air inside the car fresh. Pay special attention not to use perfumes or air fresheners to mask unusual odors inside the car. 3. After entering the car: Open the windows or turn on the external circulation ventilation system to introduce fresh air. Do not drive for long periods with the windows and doors closed, and never sleep or rest for extended periods in a sealed car. 4. In areas with severe traffic congestion: Temporarily adjust the air conditioning or heating system to the internal circulation mode. Vehicles driving with windows open should temporarily close the windows. Car owners should develop the habit of adjusting the car's air circulation system promptly based on the external air conditions. 5. When turning on the air conditioning or heating: Use the mode that exchanges air inside and outside the car, and try to avoid using the internal circulation mode for extended periods. When driving on urban roads, try to use the internal circulation mode. If the external circulation is used, exhaust fumes from other vehicles may enter the car. When driving on highways, you can turn on the car's external circulation.
The functions of car air circulation are mainly divided into internal circulation and external circulation. Internal circulation recirculates the air inside the car, preventing outside air from entering. This is especially useful in summer when using the air conditioning, as it quickly cools down the small interior space since the AC only cools the air inside. During heavy traffic, I often use internal circulation to avoid exhaust fumes or dust from entering the car, which is safer for the lungs and respiratory system. External circulation, on the other hand, draws in fresh outside air to increase ventilation. In winter when using the heater or when the windows fog up, I always switch to external circulation to maintain even interior temperatures and quickly defog the windows to prevent slipping. During long drives, external circulation also prevents the air from becoming stale and causing drowsiness. When switching between modes, pay attention to road conditions: on highways, external circulation saves fuel and keeps the air fresh, while in congested city traffic, internal circulation is healthier for passengers. Regularly checking the cabin air filter can improve efficiency and prevent bacterial growth that may affect breathing.
