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Defogging in Winter: Using Cold Air or Hot Air?

3 Answers

KylieLynn

07/23/25 8:42pm

In winter, both cold air and hot air can be used to eliminate fogging. Here are detailed introductions to the two methods: 1. Cold Air Defogging: Turn on the air conditioning cold air, press the A/C button, adjust the air vent direction to blow towards the windshield, and set the fan speed to the maximum position. This can reduce the temperature difference between the inside and outside of the windshield, making it less likely for fog to form and achieving the effect of eliminating fog. This method is suitable for emergency quick defogging. 2. Hot Air Defogging: Hot air takes longer to defog than cold air, but using hot air can prevent the windshield from fogging up again.

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McAmelia

08/10/25 4:21pm

I've driven quite a few times to figure out this defogging thing in winter. Fogging occurs when warm, humid air inside the car meets cold glass and condenses into water droplets. The first choice is to turn on the air conditioning, as it can quickly absorb moisture. Using cold air defogs faster, showing results in seconds, but you'll shiver from the cold. Using warm air is slower, clearing up within two minutes, but keeps you warm and comfortable. My suggestion is to first warm up the car with warm air in winter, then press the AC button to assist. Don't forget to turn on the external circulation to let fresh, dry air in for better results. Safe driving requires clear visibility, so don't hesitate to deal with fogging immediately. Develop a habit of regularly checking the air conditioning to avoid malfunctions affecting the defogging function.

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DiSteven

09/23/25 3:57am

Winter window fogging is extremely dangerous as it blurs vision and can easily cause accidents. The root cause is the condensation of warm, humid air inside the car. The most reliable solution is to turn on the air conditioning in dehumidification mode. Cold air provides immediate results, while warm air mode works slower but is equally effective with AC assistance. Turning on external air circulation or slightly opening the windows promotes airflow and speeds up defogging. When parked, open the windows for a few minutes to let out the moisture. Prioritize clear visibility for safety and don't delay dealing with it. Remember to be extra vigilant when there's a significant temperature difference between the inside and outside of the car.

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