Should You Use External or Internal Air Circulation When the Car Windows Fog Up?

[McMakayla]

When car windows fog up, you should turn on the external air circulation. Here’s an introduction to internal and external air circulation: Internal Air Circulation: Air circulates only inside the car without exchanging with the outside air. It’s essential to turn on internal circulation during traffic jams, as the density of exhaust fumes increases in congested areas. Internal circulation effectively prevents outside exhaust from entering the car, avoiding harm to passengers. It’s also advisable to use internal circulation during dusty or sandy weather, as it not only blocks outside dust but also reduces the impact of sand on the air filter. External Air Circulation: This mode connects the car’s interior air with the outside air, allowing external air to flow in through the front intake and exit through the rear vents. For newly purchased cars, it’s recommended to use external circulation as much as possible to maintain airflow between the inside and outside of the vehicle, helping to release harmful gases from the car’s interior more quickly.