Should the External Air Circulation Be Turned Off When Parking the Vehicle?
1 Answers
It is not necessary to turn off the external air circulation system when parking the vehicle. Doing so can lead to poor air circulation inside the car. Recirculating air inside the vehicle can cause the windows to fog up, which may reduce driving safety. Therefore, when temporarily parking the vehicle, it is essential to keep the external air circulation on or turn off the air conditioning system. Different vehicle models have different control methods, which can be divided into two types: The first control method involves buttons. The air conditioning control panel has buttons for internal circulation and external circulation. To use either system, simply press the corresponding button for internal or external circulation. The second control method uses a single button that toggles between internal and external circulation systems. When the button's light is on, it indicates the internal circulation system is active. The internal circulation system should be used when the air conditioning is on or when external odors are strong, effectively preventing outside air from entering the vehicle. Choosing between internal and external circulation depends on the following scenarios: Road conditions: On highways, use external circulation. Due to wind resistance and high speeds, opening windows is not advisable. Prolonged use of internal circulation can lead to hypoxia, impairing reaction and judgment, which is dangerous. Additionally, air quality on highways is generally good, with low exhaust concentrations, making external circulation suitable. In congested urban areas or during rush hours, where exhaust concentrations are high, switch to internal circulation. Vehicle condition: New vehicles often contain high levels of toxic gases like formaldehyde. For the first three to six months after purchase, it is recommended to use external circulation along with opening windows to enhance air circulation and dilute toxic gas concentrations. Air quality: In areas with severe PM2.5 pollution (above 50), where air quality is not good, it is advisable to use internal circulation to avoid inhaling excessive PM2.5 particles. Function of external circulation: External circulation ventilates the car, expelling stale, oxygen-depleted air and bringing in fresh air. In winter, if the heater is on, remember to switch to external circulation to prevent dizziness and chest tightness. Function of internal circulation: Use internal circulation during traffic jams or on dusty roads. Close the windows and switch to internal circulation to block external airflow. When parking, it is best to set the system to internal circulation. On long highway drives, if the air inside becomes stale, switch to external circulation. The use of internal and external circulation should be coordinated with the air conditioning and heating systems.