How to Solve the Problem of Fogging on the Outside of Car Windows in Summer?
3 Answers
When the outside of car windows fogs up in summer, you can adjust the vents to avoid blowing on the windshield. Here is some knowledge about car defogging: 1. Window Convection Defogging: If you notice that the fog inside the car is not heavy, you can open a small gap in the windows on both sides. This allows the air inside and outside the car to form a convection current, reducing the temperature difference and gradually dissipating the fog. The principle of this method is the same as using the air conditioner's cold air, but it does not increase fuel consumption. However, the downside of window convection is very obvious: it cannot be used during rainy or snowy weather, on highways, or when the fog is heavy. Additionally, opening the windows will lower the temperature inside the car. 2. Air Conditioning System Defogging: For most car owners, using the air conditioning system to defog is the most common method. Nowadays, almost all cars have air vents under the front windshield. Simply adjust the air conditioning to the appropriate setting to use the air blown out to defog the windows. But should you use cold or warm air? Both cold and warm air have their pros and cons. If you are in a hurry to hit the road, you can use cold air as an emergency measure. However, in most cases, it is recommended to use warm air.
I've been driving for quite some years and have seen my fair share of fogged-up windows in summer, mainly because the air conditioning inside is blasting cold air while the hot, humid air outside condenses into tiny water droplets when it hits the glass. In such cases, the quickest fix is to turn on the windshield wipers—a simple swipe can clear most of the fog instantly. If that doesn't do the trick, I switch the AC to external circulation mode and direct the airflow toward the windshield to rapidly cool the glass surface and minimize fogging. On particularly humid days, I'll spray some anti-fog solution on the windows and wipe them down before setting off, which works well as a preventive measure. Regularly checking wiper blade wear and window cleanliness is also key. Frequent fogging might indicate worn-out wipers or excessively high humidity, in which case it's best to avoid highway driving in rainy conditions. Bottom line: don't underestimate fogged-up windows—blurred vision compromises safety, so tackle the issue early to avoid trouble.
Foggy car windows in summer can be really frustrating, especially during the humid rainy season when the glass is covered in water droplets, blurring visibility and making it hard to see the road. Safety is a top priority for me, so whenever this happens, I immediately slow down and turn on the wipers to clear the surface moisture. At the same time, I press the defogger button inside the car and let the warm air blow gently on the windows for a while to dehumidify them. For prevention, I always keep the windows clean to avoid dirt buildup that can worsen condensation. I also regularly check the air conditioning filter system to ensure it effectively removes moisture. When it’s hot, I avoid setting the car’s AC too high, as a smaller temperature difference between inside and outside reduces the risk of fogging. The principle is similar to interior fogging—timely dehumidification is key to maintaining clear visibility. Remember not to wipe the windows with tissues casually, as this can scratch the glass or cause glare issues. Safety comes first when driving, so stay focused on handling fogging without distractions.
