What to Do When the Windshield Fogs Up with the AC On?

[MariaDella]

Solutions for windshield fogging when the AC is turned on: 1. Open the windows: In cases of light fogging, slightly opening both side windows to allow air circulation can help eliminate the temperature difference on either side of the windshield, preventing fog formation. Alternatively, turning on the AC's cold air can quickly remove the fog. Both methods provide fast results, but their downside is that they are not suitable for prolonged use during cold weather, snow, or rain. 2. Use the blower: Blowing cold air offers a quick but temporary fix, while blowing hot air addresses the root cause of windshield fogging. Fog won't reappear after turning off the hot air, nor will it make the car uncomfortably cold in winter. However, the main drawback of using hot air is its slow effect, requiring a long wait to see results. Additionally, running the heater while driving consumes more fuel, making it a costly option. 3. Use anti-fog spray: The principle of anti-fog spray is simple—spraying a layer on the windshield forms a protective film that prevents water condensation. However, this film's effectiveness is short-lived, requiring frequent reapplication to maintain its effect.