How to Deal with Foggy Windows When Using Air Conditioning in the Car?

[IrisLynn]

Using warm air conditioning to blow on the front windshield can effectively defog. Here are some related tips: 1. Precautions: In summer, the outside temperature is high, while the interior temperature is even higher, making it easier for fog to form when cold air is turned on. When cold air meets warm air, fog tends to develop. If the fog is not removed promptly, it can significantly impair visibility. Therefore, it is essential to defog in time and take preventive measures. 2. Other Methods: Besides using warm air conditioning for defogging, there are other products available for this purpose. For example, specialized defogging sprays can be evenly applied to the windows before use, creating a protective film on the glass that prevents fog formation.

[DelLily]

When I notice fog on the windows, my first step is to turn on the air conditioning and switch to defog mode—directing the airflow toward the windshield with increased fan speed. This allows the cool air to quickly dry the window surface and remove the fog. Remember to press the A/C button to activate the dehumidification function; otherwise, blowing warm air alone might worsen the fogging. If the situation is severe, I pull over to a safe spot to address it, ensuring clear visibility before continuing. As a preventive measure, I avoid leaving damp items in the car or speaking loudly, which can exhale excessive moisture. Every few months, I clean the interior of the windows and replace the cabin air filter to prevent fogging. If fog appears while driving, stay calm—small adjustments can make a noticeable difference.

[StBryce]

Fogging is so annoying. I immediately press the defog button in the car or manually switch the airflow direction to blow on the windshield, and turn on a bit of external circulation to introduce outside air—especially if the humidity outside is low, as this removes moisture faster than internal circulation. It's best to keep the A/C on, with the temperature set to normal, not too high. I always keep a dry cloth in the car to wipe the windshield casually, preventing fog from returning. Safety first—don’t wipe vigorously while driving. Regularly spraying defogger on the windows can also reduce trouble; it’s not expensive and one spray can maintain the effect for two weeks. Remember, the A/C only works after the engine starts, so don’t rush to drive off and forget to defog.

[Lewis]

When the windows fog up, quickly adjust the air conditioning to blow strong air directly at the glass, and make sure the A/C is on—it removes moisture from the car, addressing the root cause of fogging. Driving safety is paramount; when visibility is poor, I gradually slow down and pull over to handle it. Preventive measures are simple: avoid smoking or using air fresheners in the car to prevent increasing humidity; in summer, use sunshades when parking to reduce temperature differences. I wipe the inside of the windows weekly to prevent dust from trapping moisture. A clogged cabin air filter can reduce dehumidification effectiveness, so check and replace it every six months; if fogging occurs frequently, it might indicate a refrigerant leak in the AC system, requiring professional repair. Maintaining good ventilation habits usually keeps the problem manageable.