What Causes Windshield Fogging in Summer?
1 Answers
Fogging on the inside of the front windshield in summer is caused by the temperature difference between the interior and exterior. When the window temperature is lower than the dew point, the air's moisture content is insufficient to form water droplets, resulting in tiny water particles that condense on the window surface, creating the fogging effect. Solutions for window fogging: Using detergent-based methods: Dish soap or soap can be used to prevent fogging on car windows. Soften the soap by soaking it in water, then apply it evenly on the glass surface. Once the soap dries, remove it with a tissue or newspaper. For dish soap, mix water and soap in a 9:1 ratio and spray it on fog-prone windows during rainy days. After drying, gently wipe with a soft tissue to prevent fogging. External circulation defogging: If rain is frequent and opening windows is not feasible, turn on external circulation for defogging. Proper vent settings should direct airflow to both the front windshield and footwell or just the windshield. For automatic AC models, the compressor may not activate at lower temperatures, requiring air exchange between the interior and exterior to disperse moisture and achieve defogging. Anti-fogging agents: Commercial anti-fogging sprays designed for car windows absorb moisture from the glass surface, forming a water-repellent film that prevents fogging. After application, wiping the window with a cloth ensures clarity and provides long-lasting defogging. Window adjustment: After driving outdoors, park and open the windows to let warm air in. The temperature difference will decrease within a few minutes, causing the fog to dissipate. If parking isn't possible, use windshield wipers for the front and rear windows, and adjust the side windows to scrape off fog with the rubber seals.
