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

2 Answers
DiAlessandra
07/30/25 1:04am
Here are the methods to solve the problem of foggy car windows when using air conditioning: 1. Blow cold air: In cases of light fogging, 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. Alternatively, turn on the cold air from the air conditioning, which can quickly remove the fog in a short time. The advantage of both methods is their quick effectiveness, but the downside is that they are not suitable for prolonged use in cold weather or during rain or snow. Otherwise, while the fog may be removed, the occupants might catch a cold from the draft. 2. Blow hot air: Blowing cold air provides a quick but temporary solution, whereas blowing hot air can fundamentally solve the issue of foggy windows. The fog will not return after the hot air is turned off, nor will it make the car occupants feel even colder in the winter. However, the biggest drawback of blowing hot air is its slow effectiveness, requiring a long wait to see results. Additionally, using the heater while driving consumes more fuel, making it a bit costly.
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StEmily
08/15/25 6:35am
I've been driving for many years and often encounter the issue of foggy windows, especially during rainy or snowy weather or when using the air conditioning. When there's fog inside the car, first press the front defrost button on the AC (the one with the fan-shaped icon), adjust the air direction to blow onto the windshield, and increase the fan speed. Cold air defrosts the fastest, but if it's cold outside, use warm air to avoid getting too chilly. At the same time, open the windows slightly for ventilation for a minute or two; the fog will dissipate as the humidity drops. I also recommend regularly applying anti-fog spray on a towel to wipe the inside of the windows, which can keep them fog-free for a week or two. The key is maintaining the AC system: clean the filter and avoid internal moisture, especially by opening windows for ventilation when parking in summer. Handling it this way long-term ensures clear windows and safe driving. These methods are all very practical—don’t wait until the fog blocks your view to take action.
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