How to Solve Fogging When Using the Heater in Winter?

2 Answers
DelLogan
07/25/25 4:31am
To solve fogging when using the heater in winter, follow these steps: 1. Open both side windows; 2. Turn on the air conditioning's external circulation; 3. Adjust the air vents to defogging mode; 4. Use the air conditioning's cooling and dehumidifying function to reduce air humidity. The reason for fogging when using the heater in winter is: The temperature difference between the inside and outside of the vehicle causes the cabin temperature to be higher than the outside, leading to condensation of moisture inside the cabin on the inner windshield, forming fog. Methods to prevent fogging include: 1. Using specialized defogging products before driving; 2. Utilizing the air conditioning's cooling and dehumidifying function to reduce air humidity. The functions of the car air conditioning are: 1. Providing a comfortable environment for passengers, reducing travel fatigue; 2. Creating good working conditions for the driver, ensuring safe driving.
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AsherRose
08/10/25 5:24pm
When the car's heater causes fogging in winter, I'm quite used to it. This is mostly due to excessive humidity inside the car. Turning on the heater adds more moisture, which then condenses into fog when it meets the cold glass. My experience is: don't panic at the first sign. Activate the defogging mode of the air conditioning and adjust the air vents to blow towards the front windshield. This automatically balances the interior and exterior temperature and humidity. Also, pay attention to setting the AC to external circulation mode rather than keeping it on internal circulation, as this reduces moisture buildup. Additionally, opening the windows a few minutes before parking to allow air circulation or keeping a defogging spray in the car to treat the glass works well. During winter maintenance, check if the door seals are aging or leaking to prevent fogging issues. Safety comes first—if the fog is too thick to see the road clearly, pull over immediately and don't force yourself to drive.
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