Should You Use Internal or External Air Circulation on Highways in Summer?
3 Answers
You should use external air circulation on highways. Here are some precautions for using internal and external air circulation on highways: 1. Open the windows or use external circulation appropriately: When driving on highways for long periods, it's advisable to open the windows or use external circulation to maintain fresh air inside the car and prevent dizziness caused by lack of oxygen. Do not close the windows or turn off external circulation when sleeping in the car. 2. The choice between internal and external circulation depends on the season and weather: When the weather is comfortably cool, you can use external circulation; when it's hot, avoid using external circulation. On rainy days, use internal circulation and also turn on the defogging function to prevent fog from obstructing your vision.
In summer highway driving, the use of air conditioning's internal and external circulation requires attention. As a veteran driver with twenty years of experience, I prioritize safety: using internal circulation on the highway cools the car faster and saves fuel, especially after sun exposure. However, don’t keep it on all the time—prolonged internal circulation increases carbon dioxide levels inside the car, leading to drowsiness, which is dangerous on highways. I make it a habit to switch to external circulation for a few minutes every half hour to bring in fresh air and stay alert. Highway air is relatively clean with less pollution, so external circulation helps prevent fogging and maintains clear visibility. The key is balancing temperature control and air quality, with safety as the top priority. Remember to set a reasonable temperature—avoid setting it too low to prevent thermal shock when exiting the car. In short, switch flexibly to ensure driving safety.
During summer highway driving with AC on, I typically choose between air recirculation modes based on comfort. As an urban commuter, I often use internal circulation during initial cooling to quickly chill the cabin. But at highway speeds, when outside air quality is good, switching to external circulation brings in fresh air, reducing stuffiness and odors inside. I've noticed prolonged internal circulation leads to stagnant air, sometimes causing dry mouth and affecting long-distance driving comfort. The high-speed airflow naturally introduced via external circulation saves energy while keeping things pleasant. I prioritize external circulation in fair weather, switching back to internal mode in polluted areas or rainy conditions. Also, remember to regularly check the cabin air filter to ensure air quality. This approach keeps drives both cool and refreshing, making journeys more enjoyable.
