Which switch should be turned on when there is fog inside the car on rainy days?
4 Answers
On rainy days when there is fog inside the car, you can choose to turn on the heater or the air conditioner. Here is a detailed introduction to these two methods: 1. In summer, use the air conditioning cooling method: Utilize the air conditioning's dehumidification function to reduce air humidity and remove fog. In summer, especially when many people enter the car and the air conditioning is not turned on in time, the humidity from exhaled breath can quickly cause the windshield to fog up. At this time, you can turn on the air conditioner to blow cold air toward the windshield, using the dehumidification function to quickly remove the fog. However, if the humidity is too high and the air conditioning is not effective, you can slightly open the window to rapidly reduce the humidity inside the cabin. 2. In winter, use the air conditioning heating method: Utilize the method of raising the temperature to remove fog. In winter, use the heater to blow warm air onto the glass, quickly raising the glass temperature. By reducing the temperature difference between the inner and outer surfaces of the windshield, you can prevent excessive fogging. However, it should be noted that the rear and side windows heat up more slowly, so it may take longer to completely remove all the fog.
Having driven for over twenty years, my experience tells me that when there's fog inside the car on rainy days, you should quickly press the button on the center console with the fan-shaped symbol—this is the front windshield defroster switch. Simultaneously, press the A/C button to activate the air conditioning compressor for dehumidification. The principle is to use cold air to absorb moisture and clear the view. I recommend setting the fan to medium speed to avoid the noise of high airflow; setting the temperature lower is more effective, and turning on a bit of external circulation prevents humidity from rising again. Before the fog expands, wipe the inside of the front glass with a soft cloth to save trouble. Safety comes first when driving in the rain—don’t wait until the fog gets severe to act, as it can easily lead to accidents. Make it a habit: operate immediately at the first sign, and only hit the road when your vision is clear.
As an automotive technology enthusiast, I've found that fogging occurs when high humidity inside the car condenses upon cooling. The best solution is to press the A/C button to activate the air conditioning dehumidification function while selecting the defrost mode to position the air vents. Newer models may have automatic sensors, but manual operation clears fog faster. The principle is that A/C reduces relative humidity, providing immediate defogging effects. Set the temperature below 20°C with medium fan speed. Ensure the cooling system works properly by regularly checking filters to prevent clogging. Using only warm air is slower as it doesn't dehumidify. Remember not to turn off the A/C after operation to maintain system stability.
When driving with family in rainy and foggy conditions, I immediately press the front windshield defrost button (symbol resembling a fan or glass). Turning on the air conditioning clears the fog within seconds. Set the fan to medium speed and adjust the temperature to a comfortable level, avoiding excessive cold to prevent discomfort for the children. If the fog is too heavy, pull over to deal with it or open the windows for ventilation. Safety comes first—never risk driving without clear visibility. Prioritizing life is paramount, and these simple methods are highly practical.
