Can the car's internal and external air circulation only be turned on when the air conditioning is on?
2 Answers
External circulation introduces fresh air, while internal circulation blocks out polluted air. The use of internal and external circulation should be combined with the air conditioning or heating system. Turning the air conditioning on or off is unrelated to air exchange. When set to external circulation, even if the fan is off, external air will enter the vehicle through the ducts as long as the car is moving. Below are the correct methods for using internal and external circulation: 1. In traffic jams: Use internal circulation with the air conditioning, as external circulation would draw in exhaust fumes from outside. 2. General air conditioning cooling: Use internal circulation to quickly lower the temperature inside the car. Once the temperature stabilizes, switch to external circulation appropriately to exchange air with the outside. 3. Air conditioning heating: After a cold start, wait for the engine to warm up before turning on the heating with internal circulation. Once the temperature stabilizes, switch to external circulation appropriately to exchange air with the outside. 4. Rainy or foggy days: These conditions can easily cause window fogging. To prevent this, simply press the front window defogging button, lower the temperature slightly, and increase the fan speed.
Let me clarify this point. The air recirculation mode actually has nothing to do with whether the AC is on or off—it's simply a flap switch that controls the air intake. When the car feels stuffy, press the recirculation button to keep the interior air circulating internally. For fresh air, switch to external circulation to let outside air flow in. Some cars are smartly designed to automatically engage recirculation when cooling is activated for better efficiency, but you can manually toggle between modes anytime, even with just the blower on and AC off. Switching modes is especially useful when using the heater in winter to prevent window fogging. So this feature isn’t tied to AC operation at all—it’s purely about how you want to regulate airflow.
