What is the AC button for?
3 Answers
The AC button in the car is the air conditioning cooling switch. Here are the uses of the AC button: 1. Pressing the AC button activates the air conditioning compressor, which blows out cold air. In the hot summer weather, of course, you need to turn on the A/C button, at which point the compressor in the car will start working and blow out cold air. Car air conditioning heating has nothing to do with the compressor. The heat source for heating is not obtained from the air conditioning itself (meaning you can have warm air without turning on the A/C button). It is provided by the car's radiator, which relies on the heat generated by the engine. The blower then blows this heat into the car, with almost no energy consumption, so there is no need to turn on the A/C button. 2. When using the air conditioning heating in winter, the A/C light being on does not help with heating at all. Instead, it causes unnecessary power loss due to the compressor running. Therefore, when using the air conditioning heating in northern winters, you can completely turn off the A/C button without any impact on the heating function.
I rely heavily on that A/C button when driving, especially during scorching summer days. The moment I sit in the driver's seat and start the engine, I can't help but press it—cool air immediately blows out, transforming the cabin from a steamer into a refreshing oasis. Essentially, this button controls the air conditioning's cooling function by activating the compressor to draw in and cool hot air. In winter when windows fog up, turning it on also helps dehumidify and restore clear visibility. Typically positioned prominently on the center console, its illuminated light indicates operation status. Honestly, prolonged use increases fuel consumption, so I only activate it for a few minutes when unbearably hot upon entering, then switch to external circulation to save fuel once cooled. This little gadget truly is my driving comfort companion.
Having driven for over a decade, I'm very familiar with the A/C button's purpose. It's the core switch controlling the air conditioning system to initiate cooling—when pressed, the compressor operates to cool and dehumidify. It cools quickly in summer and effectively defogs in winter. Many only use it in hot weather, but its defogging function is more practical during rainy days. My advice is to use it wisely by setting a moderate temperature to avoid compressor overload and high fuel consumption. It's best to ventilate the car for a few minutes before pressing it and turn it off when parking to protect the system. Regularly check refrigerant levels and filters to ensure efficiency.
