How to Deal with Foggy Windows on a BYD?

[DanielRose]

Generally, car windows fog up due to a significant temperature difference between the inside and outside. In this case, you can turn on the cold air inside the car and direct it towards the windshield. After starting the car, adjust the air conditioning to the warm air setting and direct it towards the windows. However, this method takes a long time to ensure the temperature difference between the inside and outside is balanced. You can purchase some anti-fog agents for car windows online, apply them to a towel, and then wipe the glass around the windows to prevent fogging. This method is low-cost but troublesome. Alternatively, you can use soapy water with a towel to wipe the inside and outside of the windows. The last method is relatively economical. You can buy some glass cleaner, apply it to a towel, and then use it to wipe the car windows.

[VonCarter]

Foggy windows while driving are quite common. From my experience, the first step is to press the defogger button on the AC control panel – most BYD models have a fan-shaped button for this. When pressed, the AC automatically switches to maximum airflow directed at the windshield. Cold air removes fog faster, but in winter you can wait for the engine to warm up and then switch to hot air. Remember to turn on the external circulation simultaneously to expel moisture. For the rear windshield, press the rectangular button with wavy lines (heating function). Keeping a dry towel in the car for emergency wiping helps. During car washes, ask the attendant to apply anti-fog spray on interior glass surfaces, which prevents fogging for weeks. Avoid leaving damp items like umbrellas or wet rags in the car when parked, as they increase condensation. Regular cleaning of AC filters also matters – a well-ventilated system significantly reduces fogging risks.

[DeVictoria]

From a maintenance perspective, fogging occurs when high-humidity air inside the car condenses on cold glass. BYD's air conditioning system typically features a dedicated defogging mode that can be activated with one click to coordinate the compressor, blower, and air vents. Using cold air quickly removes moisture but may make occupants feel chilly; it's recommended to use warm air for defogging in cold weather, though you'll need to wait for the engine coolant to warm up first. Recirculation mode is essential—otherwise, interior humidity won't decrease. Frequent fogging may indicate issues like: a clogged cabin air filter reducing dehumidification efficiency, or compromised door/window seals allowing external moisture ingress. Additionally, unsealed drink cups or excessively wet floor mats can become humidity sources. Never wipe fogged windows immediately—first activate the defog function before handling.

[VonStephen]

I always worry about foggy windows when taking kids out, especially when they breathe heavily in cold weather, causing the windshield to become misty. I usually start my BYD in advance, set the heater to around 25°C, turn the fan to the third level, and direct the airflow toward the windows. I always keep defogging wipes in the car—wiping the windows once can keep them fog-free for two or three days. On rainy or snowy days when humidity is high, I switch the AC to external circulation to reduce moisture. When using the heater, leaving a small gap in the window is also a handy trick to prevent fogging. You can also place bamboo charcoal bags under the seats to absorb moisture. Safety comes first—if visibility is poor, I pull over to handle it instead of wiping while driving.