Should the car air conditioning use internal or external circulation in summer?
1 Answers
Whether to use internal or external circulation for the car air conditioning in summer is not determined by the season but rather by a comprehensive assessment of the driving environment. Below are the relevant details: 1. The difference between internal and external circulation: The most obvious distinction between internal and external circulation in car air conditioning is the air intake location. Different intake positions result in different airflow movements. 2. Internal circulation explained: The air intake is inside the car, meaning outside air cannot enter, and inside air cannot exit. Prolonged use of internal circulation can lead to stale air, reduced oxygen levels, and symptoms like heat discomfort, fatigue, and anxiety, which can affect driving safety. 3. External circulation explained: The air intake is located below the front windshield wiper, at the junction of the windshield and the engine hood. Simply put, it draws outside air into the car. External circulation ensures air flow inside the car and is suitable when the outside air quality is good. 4. Tips for using internal and external circulation in car air conditioning: (1) If the car has been parked under the sun for a long time and the interior feels like a sauna, it is best to first turn on external circulation for ventilation and cooling after getting in. Opening the windows and sunroof can also speed up cooling. After 3-5 minutes, when the interior temperature stabilizes, close the windows, turn on the cooling function, and switch to internal circulation. (2) If the car is parked in a garage or a shaded area, it is recommended to first use internal circulation to maximize the cooling effect of the air conditioning and lower the interior temperature more quickly. (3) During traffic jams, use internal circulation to prevent external circulation from drawing exhaust fumes into the car. (4) Whether cooling in summer or heating in winter, periodically switch to external circulation to maintain air exchange between the car interior and the outside environment.
