What to Do When the Windshield Fog Won't Blow Away?
3 Answers
This method is the most effortless and quickest: locate the front window defogging mode, set the fan speed to maximum, turn on the A/C switch, and then adjust the temperature to the lowest setting. You can use the air conditioning's hot air to defog. If the car has just started, temporarily avoid turning on the air conditioning until the engine has warmed up for a few minutes. You can also prepare a defogging spray, which is not expensive. Before traveling, simply spray it evenly on the surface of the car window glass and then wipe it clean with a dry towel.
I often encounter the problem of windshield fogging while driving, and it drives me crazy when the air conditioning doesn't help. Later, I discovered the correct approach: first, turn on the AC button to dehumidify, then press the defrost button (the one with the fan-shaped icon), set the fan speed to maximum, and direct the airflow toward the windshield. If it still doesn't work, I try adjusting the temperature to use warm air or switch back to cold air. Large temperature differences between the inside and outside of the car can cause fogging, so cracking the window slightly for ventilation can help. If the windshield is too dirty or has an oily film, it can also accumulate fog, so I regularly clean it with dish soap. Remember, if the fog is too thick to see through, pull over safely immediately, wipe it with a dry towel, and then continue driving. Develop the habit of preheating the air conditioning for a few minutes before driving to avoid scrambling while on the road. These small tips have helped me stay safe on countless trips.
Having driven for over 20 years, I never panic when encountering windshield fog that won't clear. Most often, it's due to incorrect air conditioning settings. I simply switch to external circulation mode for rapid air exchange, increase the fan speed, and direct warm air at the glass. Avoid using internal circulation when fog is heavy—poor airflow makes it worse. Keeping the glass clean is crucial; otherwise, moisture accumulates easily. Regular cleaning with professional anti-fog agents helps. Prevent fogging by not leaving wet items like umbrellas or shoes inside. A clogged cabin air filter weakens airflow—replace it every six months to avoid issues. In cold winters, I start the engine early to preheat the AC for defogging. With a few patient adjustments, the fog clears, ensuring much safer visibility.
