What are the reasons why car air conditioning refrigerant cannot be added?

[Hunger]

Car air conditioning refrigerant cannot be added because there is a blockage in the air conditioning system. The role of the refrigerant is: to use its own physical changes to remove the heat inside the car. Under high pressure, the refrigerant forms a liquid while releasing heat. The functions of the air conditioning system: 1. Achieve a cooling effect by continuously changing the circulation of the refrigerant; 2. Draw in fresh external air for ventilation and air exchange, preventing the windshield from fogging up; 3. Use the engine coolant, waste heat, or heat generated by a burner as a heating source, which is heated by the heater and blown into the car by the blower to raise the temperature and achieve a heating effect; 4. Remove dust, odors, smoke, and toxic gases from the car's air, making the air inside the car fresh, and humidify the car's air to increase the relative humidity of the air inside the car.