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What is the function of the car's internal and external circulation?

2 Answers

DelJune

07/24/25 1:39pm

The function of the car's internal and external circulation is to improve the air quality inside the vehicle. The following are specific introductions about the car's internal and external circulation: 1. Principle: The external circulation state uses a fan to draw air from outside the car into the interior, meaning the air passage between the outside and inside of the car is open. The air blown by the fan comes from outside the car, and even if the fan is not turned on, there is still airflow being drawn into the car while driving, replenishing fresh air inside the car. 2. Usage method: Use internal circulation during traffic jams and external circulation on highways. The use of internal and external circulation should be combined with the air conditioning and heating system. By using external circulation, you can breathe fresh air from outside the car. When driving on highways for a long time, the air inside the car may become stale, making people uncomfortable. Since opening the windows is not an option, using external circulation can bring in some fresh air.

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LaArthur

08/11/25 7:39am

The main function of the car's internal and external air circulation is to regulate the air quality inside the vehicle. When driving, I often use the internal circulation to recirculate the air inside the car, preventing external pollutants such as exhaust fumes and dust from entering. Especially in heavy traffic or highly polluted urban areas, turning on the internal circulation makes the cabin air much fresher, and the air conditioning works more efficiently, saving fuel in summer by cooling faster and improving heating efficiency in winter. However, don't keep the internal circulation on for too long, as the air can become stale, potentially causing dizziness or drowsiness, which could affect safe driving. At this point, you should switch to external circulation to let in some fresh outside air and stay alert. Remember to replace the cabin air filter regularly to maintain its effectiveness. Flexible switching between the two modes ensures a more comfortable and safer driving experience.

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