Why Does the Passenger Side Window Fog Up?

[ArcherLynn]

The reason the passenger side window fogs up is due to the strong air conditioning inside the car, which makes the interior very cold. When the hot air outside meets the cold glass, it condenses and causes fogging. There are two methods to defog the car windows: 1. Roll down the window: Allow air convection by partially rolling down the window to let the cold air from outside blow into the car, creating a convection of hot and cold air. This reduces the temperature difference between the inside and outside of the car, helping to eliminate frost and fog. If the weather is particularly cold, you can intermittently open and close the window; 2. Use the air conditioning defogging system: Adjust the "airflow mode" to "defog," which mainly controls the warm air to ventilate towards the windshield and the air vents near the rearview mirrors on the driver and passenger side front windows.