When to Generally Turn on the Internal Circulation?
2 Answers
There are generally the following situations when turning on the internal circulation in a car: 1. Turn on the internal circulation during traffic jams, as the more congested the traffic, the higher the density of exhaust fumes in the air. At this time, the internal circulation can effectively prevent external exhaust from entering the car, avoiding harm to passengers. 2. Turn on the internal circulation when encountering windy, sandy, or dusty weather. When the temperature is too high or too low, you can first turn on the internal circulation to seal the car, then turn on the air conditioning. After the temperature drops, switch to external circulation every half hour to keep the air inside the car fresh. Extended content: 1. The working principle of external circulation is to use a fan to bring outside air into the car and expel the air inside the car through the fan, achieving ventilation without opening the windows. 2. The principle of internal circulation is simple: it circulates the air inside the car, especially when turning on the heater in winter or the air conditioning in summer, to promote air circulation inside the car.
After years of driving, I've found that the best times to use the air recirculation mode are mainly in congested areas or places with poor air quality. For example, during peak traffic hours when there's heavy exhaust fumes mixed with dust outside, turning on recirculation effectively blocks these pollutants, making breathing much easier. On scorching summer days when the car interior is unbearably hot upon entry, activating recirculation before turning on the AC makes the cooling effect come much faster - you'll feel comfortable within minutes. When passing through tunnels, garbage dumps, or roads with strong odors, temporarily switching to recirculation is the most effective way to block unpleasant smells. However, it's not advisable to keep it on continuously - switch back to fresh air mode after 20 minutes to replenish oxygen and prevent drowsiness. Don't forget to replace the cabin air filter during regular maintenance, as this ensures the recirculation function remains effective longer and makes driving more worry-free.
