Why does the car air conditioning system show no leaks under pressure?

[DiHector]

No leaks under pressure occur because the precision of high-pressure gas charging for leak detection in the air conditioning system is insufficient. Here are the relevant explanations: 1. Check the high-pressure valve core: Since low-pressure evacuation is generally performed. Press the high-pressure valve with your finger to see if there is a suction sensation. If no issues are confirmed, then the only remaining possibility is the compressor oil seal leak. Due to current environmental standards, the structure of compressor oil seals should be understood. Therefore, there will be no leaks under pressure, but leaks may occur during evacuation. 2. Car air conditioning: Used to adjust and control the temperature, humidity, air cleanliness, and airflow within the car cabin to optimal conditions, providing a comfortable environment for passengers and reducing travel fatigue; creating good working conditions for the driver and playing an important role in ensuring safe driving as a ventilation device. It generally includes refrigeration devices, heating devices, and ventilation devices.