What is the correct way to use the internal and external air circulation?
3 Answers
Allow the car to warm up for a while, and turn on the heater after the water temperature rises. First, switch to external circulation to expel all the cold air inside the car. Once the temperature stabilizes, appropriately switch to external circulation to exchange air with the outside. To maintain the interior temperature, use internal circulation. Do not open the windows; simply turn on the external circulation.
As a frequent city commuter, I've always considered the switching between air recirculation and fresh air modes as a crucial driving skill. Recirculation mode primarily circulates cabin air, which is especially useful for avoiding exhaust fumes in traffic jams or during harsh weather like sandstorms, while also enabling faster cooling/heating and better fuel efficiency. Fresh air mode brings in outside air, ideal for highway driving or clear days when you want better ventilation, and particularly effective for quick defogging when combined with the blower. I remind myself not to use recirculation mode for extended periods to avoid stuffy air that may cause motion sickness, so I switch to fresh air mode every half hour for ventilation. The operation is simple - just press the dashboard button, and it becomes second nature with practice, ensuring both safety and comfort.
As a parent who frequently travels with kids, I pay special attention to how in-car air quality affects children. The recirculation mode is incredibly useful during high pollution or pollen seasons—it blocks external odors and allergens from entering the vehicle, safeguarding health. On the other hand, fresh air mode is key to preventing stuffiness, especially when kids are playing in the back seat, as it brings in fresh air to avoid CO₂ buildup that causes drowsiness. My routine is to use recirculation during heavy smog, switch to fresh air mode in the early morning or after rain for cleaner air, and immediately activate fresh air mode with defrost to dehumidify when fogging occurs. By regularly following these steps, the cabin stays comfortable and safe, making trips more worry-free.
