How to Deal with Fog on the Windshield When Driving in Summer?
3 Answers
There are several methods to handle fog on the windshield in summer: 1. You can reduce the fan speed and turn on the external circulation. Lower the air conditioning fan speed while activating the external circulation, then set the airflow to fully direct at the windshield. The fog will dissipate after a while, though this method is slower and only suitable for light fog. 2. Mix anti-fog solution with dishwashing liquid and water in a ratio of about 1:10, then apply it to the glass with a cloth. This not only provides long-lasting defogging but is also cost-effective. If dishwashing liquid is unavailable, windshield washer fluid can also help remove fog. 3. Turn on the warm air. When the fog is heavy and methods like opening windows for convection or using wipers are ineffective, adjust the air conditioning temperature to warm air, increase the temperature, and set the airflow direction to fully direct at the windshield. The fog will disappear shortly, with very noticeable results, though it might feel a bit hot in the summer. 4. Open windows for convection. If the fog is not heavy, you can crack open the side windows slightly to allow air convection inside the car. When the interior temperature approaches the outside temperature, the fog will dissipate. However, this method is only suitable for low-speed driving conditions.
Windshield fogging in summer is something I've often encountered driving trucks for years, mostly due to the outside heat and the cool air conditioning inside causing condensation. Don't panic—immediately turn on the defog mode (the one with the fan-shaped icon), set the fan to maximum, and direct cold air at the glass while slightly opening the windows for air exchange. Never use hot air, as it will make the fog worse, complicating things further. Also, clean the inside of the windshield when parked to prevent dirt from trapping moisture, and regularly replace the AC filter to reduce fogging. Safety first—if the fog gets too thick, pull over to handle it. Don't push through recklessly. Developing good inspection habits makes things much easier.
I have a new car equipped with a smart system. In summer, when the windshield fogs up, simply pressing the AUTO air conditioning mode solves the problem. The system automatically adjusts temperature, dehumidifies, and defogs—cool air blows and the glass clears instantly. However, if the fog keeps recurring, it might be due to insufficient AC cooling or a dirty filter, requiring a shop inspection. For prevention, avoid parking in direct sunlight to minimize interior temperature differences, reducing fogging. Additionally, the car's connectivity features allow scheduling the AC to start and defog in advance, which is quite convenient. Younger drivers should explore these tech solutions—they save time and boost efficiency.
