What is the correct way to use the AC button?
2 Answers
The correct way to use the AC button is: the AC button in the car can only be turned on when the air conditioning is in cooling mode. AC stands for air conditioning. After turning on the AC button in the car, the air conditioning compressor will achieve cooling through different rotation modes. Since the heating system of the air conditioning is supplied by the heat generated by the engine, the AC button only has the function of cooling. When using the air conditioning on hot days, remember to turn on the AC button in the car; otherwise, the cooling function will not work. After the air conditioning compressor starts, the engine load will increase, the car's power may slightly decrease, and fuel consumption will rise because the engine supplies power to the compressor.
Having driven for several years, I’ve learned the proper use of the AC button mainly involves activating cooling and energy-saving settings. Typically, after the engine starts, pressing the AC button engages the air conditioning compressor, which turns on the cooling function. On hot summer days, I do this first, then adjust the temperature knob to a comfortable level—around 24°C, for example—while controlling the fan speed. Too high a fan speed can be noisy, while too low may slow down cooling. Don’t forget to switch to recirculation mode during prolonged stops or traffic jams to avoid inhaling exhaust fumes or dust, which also improves cooling efficiency. In winter, I turn off the AC to save fuel unless the windshield fogs up—then turning it on helps dehumidify and defog. Regular maintenance is also key, such as checking the system quarterly to prevent refrigerant leaks that could impair cooling. Proper care extends the AC’s lifespan. Remember, never press the AC button when the engine is off to avoid draining the battery or damaging the compressor.
