Why is there pressure but no refrigerant in the car air conditioning?

[DelEmilia]

It may be due to refrigerant leakage. During operation, the low-pressure side of car air conditioning is generally around 2.0~2.6bar (gauge pressure), while the high-pressure side is about 15bar. The air conditioning system is introduced as follows: Introduction: Car air conditioning refers to the air conditioning device installed in vehicles, which can cool, heat, ventilate, and purify the air inside the cabin, providing a comfortable environment for passengers, reducing driver fatigue, and improving driving safety. Structure: It generally includes refrigeration devices, heating devices, and ventilation devices. This combined system makes full use of the limited space inside the vehicle, featuring a simple structure and easy operation, making it a popular modern car air conditioning system internationally.