How to Defog a BMW on Rainy Days?
2 Answers
In the main driver's cabin, the vehicle's air conditioning control unit can be found at the center console armrest position. Then press the vehicle's one-touch start button to start the engine. Otherwise, the air conditioning control system cannot be activated. After that, click the button to turn on the car's air conditioning. Then press the button to activate the windshield defogging system.
On rainy days when driving a BMW to defog, I usually press the defog button on the AC panel right after starting the car—the one with the arrow pointing at the windshield. Pressing it increases the fan speed, directing airflow straight to the front windshield. Turning on the AC dehumidification quickly dries the fog. Using a bit of external circulation is crucial, as it draws in dry outside air to prevent humidity buildup inside. If you keep the internal circulation closed, moisture lingers, and fog forms faster. If the fog gets heavy, manually raising the temperature and fan speed clears it in seconds. This method is safe and reliable, especially important for maintaining clear visibility during highway or rainy driving. BMW’s automatic AC can also simplify things—just press AUTO, and it adjusts to handle humidity. For maintenance, check if the cabin air filter is dirty and replace it regularly to avoid clogging, which affects defogging efficiency. This simple routine ensures quick defogging without disrupting your driving experience.
