How to Solve Fogging on the Windshield When Using Air Conditioning in Summer?
3 Answers
Solutions for fogging on the windshield when using air conditioning in summer are: 1. Open the windows. In cases of mild fogging, slightly opening both side windows to allow air convection can eliminate the temperature difference on both sides of the windshield, making it difficult for fog to form. 2. Use anti-fog spray. The principle of anti-fog spray is to create a protective film on the windshield by spraying a layer, effectively preventing fogging. Additional tips: Methods for maintaining the windshield: 1. Regularly check the wipers. Wipers are one of the main sources of damage to the windshield. Over time, wipers can age, and if the wiper arm directly rubs against the windshield, it may not only fail to clean rainwater effectively but also scratch the glass. Additionally, dust adhering to the wipers can cause fine scratches and marks on the windshield. 2. Clean the windshield. It is advisable to use designated windshield cleaning fluid, which contains ingredients that dissolve grease and improve the wetting interface of the glass, helping to maintain the windshield.
I've been driving for over ten years, and fogging up the windshield in summer is all too common. The main reason is that the car's air conditioning is too cold, and when it meets the hot outside air, condensation forms on the glass. My solution is to open the windows for a few minutes after getting in the car to let the temperature balance out before turning on the AC. While driving, always remember to set the AC vents to defrost mode and keep the temperature around 25°C. Make sure to turn on the external air circulation to let dry outside air in, and know how to use the defogger button—most cars have this feature. Regularly cleaning the AC filter is also crucial, as a dirty filter reduces dehumidification effectiveness. Here’s a handy trick: wiping the inside of the glass with soapy water can prevent fogging for a couple of days. Also, avoid leaving damp items like wet towels in the car.
Back when I was driving for ride-hailing, passengers would complain about windshield fogging almost every day. The issue essentially boils down to the battle between hot and cold—the AC cools the glass, and when warm air hits it, condensation forms. My standard operating procedure was: set the AC to around 24°C, press the defog button to max out the fan speed, and turn on the external air circulation to keep the air flowing. As soon as I noticed the glass starting to fog up, I’d hit the defog button immediately—never waited until it was completely obscured. When parking, I’d try to find a shady spot under trees and open the doors for about 30 seconds to let the heat out before getting in, which significantly reduced the temperature difference. Later, I also bought a bottle of anti-fog spray—applying it to the inside of the windshield after washing the car kept it fog-free for four or five days, and each spray only cost a few cents.
