Is the AC button on or off when lit?

[StKai]

AC light on indicates the system is active. Here is relevant information: 1. The AC button controls the air conditioning compressor. During summer usage, the AC button must be activated (with light illuminated) to enable cooling; The cooling function operates by compressing refrigerant into liquid then vaporizing it to absorb heat from the air; When active, the compressor pulley engages, increasing engine load and fuel consumption. 2. AC stands for Air-conditioning - the climate control system that regulates cabin temperature, humidity, air purity and circulation to optimal levels, ensuring passenger comfort and reduced travel fatigue while providing drivers with better working conditions. This ventilation system plays a vital role in safe driving.