Which air conditioning mode should be turned on when there is heavy fog in the car?
2 Answers
If fogging occurs in winter, warm air should be used for defogging. If fogging occurs in summer, cold air can be used for defogging. Turning on the external circulation mode during defogging is more effective and speeds up the defogging process. Activating external circulation helps expel the moisture inside the car to the outside, thereby reducing the fogging phenomenon. Additional information: The reason for fogging inside the car is due to the water vapor exhaled by passengers inside the vehicle, as well as the heat emitted by the human body, which gradually raises the temperature of the air inside the car. The temperature difference between the inside and outside of the car causes the water vapor inside to condense on the windshield, forming small droplets and resulting in fogging. Methods to defog the car include: 1. Using cold air for defogging. 2. Wiping with a dry cloth or tissue. 3. Using a fan with hot air. 4. Turning on the air conditioner with hot air. 5. Wiping with detergent and a dry cloth. 6. Opening the windows to allow air convection.
When I encounter heavy fog inside the car while driving, I simply press the front windshield defogger button, usually the fan-shaped icon or MAX DEF mode. It automatically activates the A/C compressor for dehumidification while increasing fan speed and temperature, quickly dissipating the fog. The external circulation is also crucial, as opening it allows fresh, dry air to replace the moisture, improving effectiveness. Remember not to use internal circulation, as it would worsen moisture accumulation. I've also developed the habit of regularly cleaning the oil film on the inner side of the windows to reduce fog formation. Pay special attention during winter or rainy days, and if the fog is severe, pull over immediately to handle it—safety first. This method has worked reliably for me over the years, especially on highways when visibility is poor, clearing up within seconds.
