Do You Need to Press the AC Button When Turning on the Heater?

[McAdelyn]

You do not need to press the A/C button when turning on the heater. If the A/C button is pressed, the car vents will blow cold air. Here is some information about the A/C button: 1. The full name of the A/C button is 'aircondition,' which translates to the air conditioning button. The function of this button is to act as the switch for the car's air conditioning cooling system. Whether it's a manual or automatic air conditioning system, the car's air conditioning system has an A/C button on the internal control panel. The A/C button is an important part of the car's air conditioning system, which is designed to cool, heat, ventilate, and purify the air inside the car. 2. When using the heater in winter, pressing the A/C button does not help with heating. On the contrary, the car will experience unnecessary power loss due to the operation of the compressor. Therefore, when using the heater, you can completely turn off the car's compressor (i.e., do not press the A/C button). Not pressing the A/C button will not have any impact on the heater's performance.

[Terry]

You don't need to press the AC button when turning on the heater, mainly because the car's heating system utilizes the heat generated by the engine operation to warm the air through the heater core, without relying on the air conditioning refrigeration system. Simply adjust the temperature knob or button on the climate control panel to a higher setting, and the fan will blow out warm air. This process is straightforward and doesn't require additional steps. However, in certain situations, such as humid weather when windows are prone to fogging, pressing the AC button can activate the compressor for cooling and dehumidification, making the air drier before heating it, which enhances comfort. I believe it's important to understand this distinction to avoid unnecessary fuel consumption and mechanical load, thereby extending the system's lifespan. Normally, just adjusting the temperature is sufficient while driving, and you can skip the AC when dehumidification isn't highly needed.

[CarlosFitz]

From a system principle perspective, heating and cooling are separate functions: warm air is provided by the engine coolant heat, simply activated by the temperature setting switch to open the heating pathway; the AC button specifically activates the air conditioning compressor for cooling and dehumidification, so turning on the heater doesn't require touching it, avoiding unnecessary energy consumption. However, in high humidity environments, pressing AC first to dehumidify before heating can prevent window fogging, enhancing driving safety. Having analyzed numerous car air conditioning designs, I found this combination method both fuel-efficient and practical—owners just need to adjust habits based on weather. Remembering this in daily operation allows efficient use of the car's heating system.

[MacNathan]

To turn on the heating, you don't need to press the AC button. Simply turn the temperature knob to the heating setting. The AC is for cooling, and using it might increase fuel consumption, unless you're using it to dehumidify when the humidity is high. This is a basic operation, simple and straightforward. I'm used to operating it via the panel in the car to avoid complications.