Why can't I see through both windows when the air conditioning is on in the car?

[DeAniyah]

The reason why you can't see through both windows when the air conditioning is on in the car is due to fogging. Here are the solutions to resolve the issue of fogged windows when the air conditioning is on: Blow cold air: When the fog is not too heavy, you can appropriately open both windows to allow air convection, which eliminates the temperature difference on both sides of the windshield, making it difficult for fog to form. Blow hot air: Blowing cold air provides a quick but temporary solution, while blowing hot air fundamentally solves the problem of window fogging. The fog won't return after the hot air is turned off, nor will it make the people in the car feel even colder in the freezing winter. Anti-fog spray: Spraying a layer on the windshield can form an effective protective film to prevent water vapor condensation. However, the effectiveness of this protective film is short-lived, requiring repeated applications to maintain the effect. Automatic defogging: For some high-end brands, vehicles are equipped with anti-fogging functions. The air conditioning system in these models constantly monitors the temperature and humidity inside the car and analyzes the critical temperature for water vapor condensation at that moment based on these two indicators. By comparison, it can determine whether the air inside the car will cause fogging on the front windshield.

[BentleyMarie]

I noticed that the windshield fogs up and becomes unclear after turning on the AC, which happens in many cars mainly due to the large temperature difference between inside and outside causing condensation on the inner glass surface. As a father of two, I take driving safety very seriously. When encountering this issue, don't rush to drive immediately. Check your AC settings: don't just use cold air, try switching to windshield defrost mode or turn on recirculation to dry the air. Cleaning the window surface is also crucial, as dirt can make fogging more noticeable. Regularly wipe the glass with a soft cloth and apply anti-fog spray for prevention. It might also be caused by dirty AC vents blocking airflow, so periodic filter cleaning helps. Avoid extreme temperature settings - mixing some warm air to balance the temperature difference is more effective. In short, safety comes first - stop and deal with it before continuing your drive.

[AliceAnn]

As a car enthusiast who loves tinkering with inventions, I often research this issue. The root cause of fogging lies in the mismatch between temperature and humidity: when the air conditioning cools rapidly, hot outside air hits the cold glass and condenses into tiny water droplets. The solution is to adjust the air conditioning system—turn on the compressor to dehumidify or use the defrost button to blow hot air, which can instantly clear the fog. When humidity is high, avoid opening windows and use the recirculation mode to reduce moisture ingress. Cleaning the glass surface also helps minimize water droplet adhesion, and applying anti-fog spray forms a protective layer. Long-term neglect can lead to obstructed vision and increased accident risks, so I recommend checking settings before each drive. For older vehicles, it's also essential to inspect whether the sealing strips are leaking air, affecting humidity control, and perform timely maintenance.

[CeciliaRose]

I drive to work every day, and the most annoying thing is the fogging caused by the air conditioning. It's usually due to the AC temperature being set too low. A simple solution is to increase the fan speed to blow air onto the windshield or switch to recirculation mode. Keeping the glass clean is crucial—wiping it with a soft cloth can help reduce the issue. For a quick fix, you can open the window slightly to ventilate for a few seconds, but be cautious of outdoor air pollution. Familiarizing yourself with the location of your car's AC controls is essential—many modern cars have a one-touch defogging feature. Don’t wait until the fog is too thick to handle; set the mode as soon as you start the car to prevent it. Developing this habit will make driving safer and reduce unnecessary stops.