Why does the car air conditioning system show no leakage during pressure testing?

[SanLilliana]

No leakage during pressurization is due to insufficient precision in detecting leaks when high-pressure gas is charged into the air conditioning system. Here are the relevant explanations: 1. Check the high-pressure valve core: Because low-pressure evacuation is generally used. Press the high-pressure valve with your finger to see if there is a suction sensation. If no issue is confirmed, then the only remaining possibility is leakage from the compressor oil seal. Given the current environmental standards, the structure of compressor oil seals should be understood. Therefore, there may be no leakage during pressure testing, but leakage can occur during evacuation. 2. Car air conditioning: It is used to adjust and control the temperature, humidity, air cleanliness, and air flow inside the car compartment to the optimal state, providing a comfortable riding environment for passengers and reducing travel fatigue; it creates good working conditions for the driver and plays an important role in ensuring safe driving. It generally includes refrigeration devices, heating devices, and ventilation devices.