What is the difference between car internal circulation and external circulation?
2 Answers
The difference between car internal circulation and external circulation lies in their functions: internal circulation serves to replenish fresh air, while external circulation blocks out polluted gases. Precautions for using car internal and external circulation include: 1. Shortly after entering the car, open the windows or activate the external circulation ventilation system to introduce fresh air; 2. After purchasing a new car, maintain air exchange between the inside and outside of the vehicle; 3. When using the air conditioning or heater, employ the mode that facilitates air exchange between the inside and outside of the car; 4. In areas with severe traffic congestion, temporarily switch the air conditioning or heater to the internal circulation mode; 5. Enhance ventilation, regularly clean the car's air conditioning system, and strive to maintain fresh air inside the car.
The car's internal air recirculation mode circulates the air inside the vehicle, similar to breathing with the windows closed, which is particularly suitable when the outside air quality is poor. If you're stuck in traffic with exhaust fumes or passing through a construction site with dust everywhere, turning on the internal recirculation can block out the dirty air. The downside is that it can get stuffy over time, and the rising carbon dioxide levels may make you drowsy. The external air circulation mode is like opening the windows for ventilation, drawing in fresh air—essential for highway driving or long trips, especially when there are passengers in the back seats who need fresh air. Switching between the two modes is easy; there's a button on the AC panel with a car and an arrow—the arrow pointing inward is for internal recirculation, and outward is for external circulation. In summer, using the AC with internal recirculation cools the car faster and can also save some fuel costs.
