What to Do When the Outside of the Car Window Fogs Up on Summer Nights

[VanCalvin]

This is the simplest method. You just need to turn on the front window defogging mode. Click the switch, and the fog will be cleared in about one minute. This method is suitable for very few situations. Opening the window can increase air convection, but if it's raining outside, the incoming wind is also quite limited.

[OAlexandra]

We veteran drivers dread the most when the windshield fogs up on summer nights, especially with the AC on. This happens because the car's AC is too cold while the outside air is humid, causing condensation when cold glass meets warm air. The solution is actually simple: turn up the AC temperature by 2-3 degrees, avoid directing vents at the windshield, and let the cool air hit people first. Another trick is to switch to external air circulation—though it brings in warm air, it balances the temperature. If your wipers can reach the fogged area, a quick spray of washer fluid followed by a few wipes can serve as an emergency fix. But don’t overuse the wipers, as they may leave streaks. Personally, I prefer wiping the outside with a towel at red lights—it’s much cleaner than dry-wiping with wipers.