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

[Marcus]

To use the internal and external air circulation in a car: 1. Start the vehicle to activate the air conditioning for cooling or heating. 2. Simply turn the adjustment knob, and the display will show the temperature while the car's circulation function is activated. 3. Turn on the A/C switch to make the blower work. 4. Rotate the knob—typically, the left side is for cooling (blue indicator) and the right side is for heating (red indicator). Choose according to the weather. 5. Adjust the air circulation inside the car; there are external and internal circulation functions. For cooling, you can switch to internal circulation, while for ventilation, use external circulation.

[GavinAnn]

As someone who drives to work in the city year-round and frequently encounters various weather changes, I've found that using the car's air recirculation and fresh air modes is actually quite simple. Pressing the recirculation button keeps the air circulating only inside the car, which is particularly useful during smoggy days or heavy traffic with strong exhaust fumes—it prevents outside dirty air from entering and helps the air conditioning cool or heat faster. When you press the fresh air button, it draws in fresh air from outside, which is great for driving in rural areas or when the air quality is good for ventilation. However, I must remind you not to keep the recirculation mode on for too long, as high carbon dioxide levels can make you fatigued while driving. I usually switch to fresh air mode for a few minutes after 30 minutes of recirculation to keep the air fresh and safe. Additionally, using fresh air mode on rainy days helps prevent window fogging, which can obstruct visibility. Using these functions wisely not only enhances driving comfort but also saves energy—for example, in summer, starting with recirculation to cool down quickly before switching to fresh air mode is more efficient.

[EvangelineMarie]

As someone with years of driving experience, I believe mastering the air recirculation function should start from real driving scenarios. The vehicle's climate control panel usually has a button marked with the recirculation symbol. Pressing it once activates recirculation mode, where air circulates within the closed cabin - ideal for blocking external pollutants like highway exhaust fumes. Press it again or hit the fresh air button to switch to external air intake, perfect for countryside drives or morning ventilation. My recommendation: use recirculation initially to accelerate heating/cooling, then switch to fresh air to maintain comfort. Always consider weather conditions: use fresh air in rain to prevent window fogging, and start with recirculation on hot days to conserve energy. Pro tip: regularly inspect your cabin air filter to ensure proper filtration - a clogged filter can negate the system's effectiveness. This practice extends your AC's lifespan and ensures worry-free driving.

[VonGeorge]

If you care about the in-car air quality, choosing between recirculation and fresh air mode is crucial. When the recirculation button is activated, the cabin air circulates in a closed loop, preventing external smoke or odors from entering - I use this feature when driving through industrial areas to protect my breathing. The fresh air mode introduces outside air to replenish oxygen, ideal for rural areas or sunny days. However, don't keep recirculation mode on continuously; prolonged use may cause CO2 buildup leading to drowsiness - I typically switch to fresh air for a few minutes after 20 minutes of recirculation. Also avoid recirculation after someone smokes in the car, as it traps smoke particles. Vehicles with automatic temperature-based mode switching are more energy-efficient while maintaining air freshness, which is particularly vital for long journeys to prevent driver fatigue.