How to Use the Car's Internal and External Air Circulation?
1 Answers
Internal circulation prevents outside air from entering the car, aiming to block harmful particles from coming in with fresh air. On the other hand, external circulation can slightly improve fuel efficiency when used in winter. The specific operations for internal and external circulation are as follows: 1. The purpose of external circulation is to replenish fresh air inside the vehicle, while internal circulation keeps dirty air out. External circulation introduces outside air into the car, whereas internal circulation only recirculates air from within the vehicle, creating an air cycle inside the cabin. When entering a car in summer where the interior temperature is high, turn on the air conditioning, select A/C cooling, and then switch to external circulation. Since the interior temperature is higher than outside, external circulation helps cool the car faster by quickly replacing the hot air inside. Once the temperature drops, switch back to internal circulation to retain the cool air, ensuring better cooling and insulation. 2. Internal and external circulation should not be used rigidly—keeping one mode constantly can affect health. Adjust according to actual conditions. For example, in hot weather, a car parked outdoors temporarily will be too hot to sit in directly. Open the windows and turn on external circulation to let the hot air escape. Then close the windows, turn on the air conditioning, and switch to internal circulation while driving to maintain airflow. In cold weather, start with internal circulation to retain warmth, then switch to external circulation when appropriate. On highways, using external circulation allows air to flow in and out smoothly, improving fuel efficiency. On rainy days, external circulation helps remove fog from the windows, ensuring clear visibility. Additionally, for a newly purchased car, use external circulation and open windows to release harmful gases and eliminate odors.
