What Causes Fogging on the Front Windshield in Summer?

[DeCooper]

Because air conditioning is generally used when driving in summer, the temperature outside the car is lower than that inside, causing the water vapor inside the car to form many tiny water droplets. The surface of the front windshield is not perfectly smooth (it has many small pits), so these small water droplets adhere to the front windshield, resulting in fogging. The following methods can be used to remove the fog: 1. Open windows for convection: If the fog is not heavy, you can open a gap in the side windows to allow air convection inside the car. When the temperature inside the car approaches that outside, the fog will dissipate. However, this method is only suitable for low-speed driving. 2. Adjust the air vent direction: Choose a blowing direction that does not target the front windshield to eliminate the fog.