Should You Use Cold or Warm Air to Defog a Car?
1 Answers
Both warm air and cold air can be used to defog a car. The differences between the two methods: Using warm air to blow on the windshield is more effective than cold air because it essentially dries out the water vapor, preventing the issue of fogging up again. However, warm air defogging is slower than cold air, and the fog may initially worsen when first turned on, requiring a few minutes of patience. If you need to quickly remove fog from the windshield, cold air is the better choice. Cold air defogging: Turn on the air conditioning's cold air, press the A/C button, adjust the vents to blow toward the windshield, and set the fan speed to maximum. This reduces the temperature difference between the inside and outside of the windshield, making it harder for fog to form and effectively eliminating it. However, this method is best suited for emergency quick defogging, as the cold air can make the driver feel chilly. Warm air defogging: In winter, using warm air for defogging is more comfortable. Although warm air takes longer to defog than cold air, it prevents the windshield from fogging up again. When the driver turns on warm air for defogging, the fog on the windshield may initially increase—don't panic. After a short wait, the warm air will dry out the fog.
