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Do You Need to Press the AC Button When Using the Heater in Winter?

2 Answers

DiRachel

07/28/25 5:51pm

When using the heater in your car during winter, you do not need to press the AC button. The AC button controls the air conditioning compressor, which is used for cooling. Therefore, if you are using the heater inside the car, there is no need to turn on the AC button. In winter, if your car windows fog up, it can drastically reduce visibility for the driver and passengers, making continued driving dangerous. However, if you turn on the AC button while using the heater, it helps keep the interior of the car dry, effectively clearing the fog from the windows. In summer, when using the air conditioning (cooling), you must press the AC button. During summer, when cooling is needed, air enters through the intake and passes through the air conditioning compressor. The compressor cools the air by compressing it before blowing it out. The transformation of normal-temperature air into cool air is entirely dependent on the air conditioning compressor, which is activated by pressing the AC button. When the AC button is pressed, a green indicator light turns on, signaling that the compressor is now operational. If you don't press the AC button when using the air conditioning in summer, the air coming out of the vents will be warm.

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LaKathryn

08/11/25 11:50pm

As a veteran driver with 30 years of experience, I'd like to share some practical advice. In winter, it's generally not recommended to press the AC button when using the heater. The AC button primarily activates the refrigeration compressor to produce cold air, while winter warmth comes from the heat generated by the engine operation, transferred to the cabin heater via coolant circulation. Simply turn the temperature knob to the heat zone (usually marked in red), then adjust the fan speed. After the engine warms up (about 5 minutes), you'll get warm air. Pressing AC unnecessarily activates the compressor, wasting fuel and straining the battery without providing heat. However, during humid conditions when windows fog severely, briefly turning on AC helps dehumidify and clear fog quickly - remember to turn it off immediately afterward to save fuel. Mastering this technique saves money, reduces hassle, and extends your AC system's lifespan.

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