What type of air should be used to defog windows when it rains?
3 Answers
When windows fog up in the rain, use warm air to defog them. The method is to first turn on the air conditioning, adjust the temperature to the warm air setting, and switch the air conditioning to the defog mode. The warm air produced by the heater will dry the fog inside the car. This way, not only the front windshield but also the side windows will quickly clear up. When defogging, be sure to switch the air conditioning to external circulation to allow fresh air from outside to enter the cabin. Setting the compressor and fan speed to the highest level can speed up defogging. If the side windows are not clearing fast enough, it's best to close the two central vents to direct more airflow to the side vents, which will help disperse the fog more quickly. You can also slightly open the windows to accelerate defogging.
I hate it when the windows fog up on rainy days! The humidity and temperature difference when you first get in the car cause the windshield to turn white instantly. The quickest way to deal with it is to turn on the cold air and direct it at the glass—the AC automatically dehumidifies. It takes about two or three minutes for the fog to clear, but your legs will be freezing. For long trips, switch to warm air by turning the temperature knob to the red zone and use the external circulation to slowly dry the glass. Remember not to use the internal circulation—it makes the fog worse! Last time, I was in a hurry to take my kid to school and tried wiping the windshield with a towel, but it just smeared and I almost rear-ended someone. Now I’ve learned my lesson and just press the front defrost button.
Many car owners don't know how to use the defog button. When it rains, just press that fan-shaped defog button after getting in the car, and the AC will automatically activate maximum airflow for dehumidification. Tests show cold air works instantly, but it's torture in winter. My habit is to turn on 24℃ warm air after the engine warms up, using external circulation to blow the windshield. If the rear window fogs up, press the square button with wavy lines for heating - the heating wires can dry moisture in five minutes. Once when driving a friend's new energy vehicle, it was even easier - just say 'defog' and it automatically adjusted AC and airflow direction. Technology nowadays is truly considerate.
