What is the function of a car air conditioning system?

[Mark]

The functions of a car air conditioning system are: 1. To achieve a cooling effect by continuously cycling refrigerant; 2. To ventilate and exchange air by drawing in fresh external air, preventing windshield fogging; 3. To use engine coolant, waste heat, or heat generated by a burner as a heating source, which is then warmed by the heater and blown into the cabin by the blower to raise the temperature for a heating effect; 4. To remove dust, odors, and toxic gases from the cabin air, making it fresher; 5. To humidify the cabin air, increasing its relative humidity.