What Causes Fogging on the Outside of Car Windows in Summer?
2 Answers
Fogging on car windows in summer occurs due to the low temperature setting of the air conditioning inside the car, creating a significant temperature difference. Below is a detailed explanation of summer car window fogging: Principle: When cold air blows out, it significantly lowers the temperature of the window area. This cold glass comes into contact with the relatively warm outside air, and when the humidity is high, it easily forms a layer of fog on the outside. Solution: For manual air conditioning models, simply turn the fan speed to maximum, turn on the A/C switch, set the air conditioning temperature to the lowest, and press the front window defogging button to see the fog gradually dissipate. For automatic air conditioning, press the AUTO switch, set the temperature to the lowest, and press the front window defogging button.
Summer car window fogging on the outside is mainly caused by temperature and humidity. When it's hot and humid outside, especially before or after rain, there's a lot of moisture in the air. Turning on the air conditioning blows cold air directly onto the windows, cooling them down significantly. When warm, humid outside air comes into contact with these cold windows, it's like condensation forming on a chilled drink bottle—the moisture condenses into tiny droplets, creating a layer of fog on the outside of the glass. This is most noticeable in the morning when leaving the garage or when the AC is first turned on, due to the sudden temperature difference. The solution is simple: avoid directing the AC's cold air straight at the windows, crack the windows slightly to balance the temperature, or slightly increase the AC temperature to reduce the effect.
