Do You Need to Turn on the AC for Car Heating?
2 Answers
You do not need to turn on the AC switch for car heating. Below is an introduction to car heating: How Car Heating Works: The heat source for the car heating system usually comes from the engine's coolant. The coolant flows through a heater core, and a blower fan then blows cold air over the heater core to warm the air, thereby increasing the temperature inside the car. Other Functions of the Car Air Conditioning System: The car air conditioning system also has other functions such as recirculation mode, fresh air mode, and ventilation mode, which should be used according to different situations. For example, when the air quality outside the car is good, you can use the fresh air mode to replace the air inside the car. Conversely, use the recirculation mode. Additionally, if the car's windshield becomes foggy, you should turn on the defogging function to restore clear driving visibility. Different situations require the use of different modes.
When I used to drive long distances in winter with heavy fog, I noticed that turning on the heater without the AC would cause the windows to fog up, making it hard to see. I had to turn on the AC to dehumidify the air. The AC switch isn't just for cooling—it also removes moisture when heating, making the air dry and comfortable. This is especially effective on rainy or snowy days when humidity is high, as running the AC along with the heater works better. If the outside air is dry, I usually turn off the AC to save fuel. Remember, the heating system works using engine waste heat, but the AC compressor is involved in the dehumidification process. Developing a habit of checking the AC switch and adjusting it based on weather conditions can improve driving comfort and protect the AC components. Don't overlook this detail—one of the keys to safe driving is maintaining clear visibility. I always check this before long trips.
