How to Use the Air Conditioning's Internal and External Circulation in a Car?

[McCollin]

Here's how to use the air conditioning's internal and external circulation in a car: 1. Use internal circulation when driving in the city; 2. Close the external circulation to block outside airflow when encountering dusty roads; 3. Use internal circulation in traffic jams and external circulation at high speeds; 4. The use of internal and external circulation should be combined with the air conditioning and heating system; 5. Use external circulation during long-distance driving to allow fresh outside air into the cabin, preventing low oxygen levels inside; 6. Turn off the fan and open the external circulation when the temperature is high to maintain cabin temperature while getting fresh air; 7. Set the air conditioning to internal circulation mode in the summer.