Can the Heater Remove Windshield Fog?
2 Answers
Proper use of the car heater can achieve a defogging effect. Operation method: First start the engine for preheating. Wait until the engine temperature gauge needle reaches the middle position, then turn on the heating air conditioning. At the same time, set the air circulation to external circulation to allow the cold air inside the car to be discharged outside. After waiting for 2~3 minutes, set the air circulation to internal circulation. Precautions for prolonged use: The heater should not blow directly at the head, as prolonged exposure can cause driver fatigue and affect driving safety. Therefore, it is recommended to open the window slightly for air circulation when using the heater for extended periods, ensuring sufficient oxygen levels inside the vehicle and keeping the driver alert.
The warm air is indeed effective in removing fog from the windshield. I've been driving trucks for many years and know this very well. After starting the car in cold weather, fog quickly forms on the windshield, making it dangerous to see the road. I usually set the air conditioning to warm air mode first, with a higher temperature setting, and direct the airflow toward the windshield. The principle is that the warm air heats the glass surface, causing the condensed moisture to evaporate. Operationally, don't turn the fan to maximum speed too quickly—start at a low speed, and the fog will clear in three to five minutes. It's also helpful to use the external air circulation to draw in dry air from outside for better results. Some people mistakenly use cold air to defog, which can make the fog worse because cold air is more humid. Remember to change the cabin air filter regularly—if it's dirty, the airflow may be too weak to work effectively. Overall, warm air defogging is efficient and reliable, and making it a habit ensures safety.
