What is the reason for the car air conditioner losing pressure after a few days of use without leakage during pressure testing?
3 Answers
If the car air conditioner does not leak during pressure testing but loses pressure after a few days of use, it is necessary to determine whether there is a lack of refrigerant. Another possible cause could be leakage from the charging valve. Below is an introduction to car air conditioning: 1. Introduction to car air conditioning: The car air conditioning system, abbreviated as car AC, is used to regulate and control the temperature, humidity, air cleanliness, and airflow inside the car cabin to optimal conditions. It provides a comfortable environment for passengers, reduces travel fatigue, and creates good working conditions for the driver, playing an important role in ensuring safe driving. 2. Components of car air conditioning: Generally includes refrigeration devices, heating devices, and ventilation devices. This combined system makes full use of the limited space inside the car, with a simple structure and easy operation, making it a popular modern car air conditioning system internationally.
I've encountered this issue before. The car's AC pressure test showed no leaks, but after a few days of driving, the cold air was gone—really annoying. I think the reason is that there are tiny leaks in the car that slowly release refrigerant under the vibrations of normal driving, or the seals have aged. Pressure testing is static and doesn’t simulate the bumps of real driving, so the problem only shows up over time. I recommend going to a professional shop to use fluorescent leak detector on all connections and condenser pipes to find those cracks invisible to the naked eye. Also, try to drive smoothly and avoid rough roads to extend the lifespan of the seals. Regular inspections of the AC system are crucial—don’t wait for a problem to fix it. It saves money and gives peace of mind.
This is exactly what happened to my car. The pressure test showed no issues initially, but after a few days of use, the air conditioning stopped cooling. This is quite common because the pressure test is conducted while the vehicle is stationary, and minor leaks may go undetected. During actual driving, the engine's heat cycles and vibrations can cause tiny cracks to expand, leading to a gradual loss of refrigerant. It's best to use professional tools to inspect the entire system, including compressor connections and the evaporator housing, as these areas are prone to aging. I've also noticed that frequent switching of the air conditioning can cause significant pressure changes, making problems more likely to occur. Maintaining a constant temperature setting while driving helps stabilize the system. Addressing issues early by visiting a repair shop can save you from costly repairs later.
