What are the reasons for incomplete vacuum extraction in car air conditioning?
3 Answers
The reasons for incomplete vacuum extraction in car air conditioning are: 1. Inadequate sealing, with leaks present, where the seal ring may be cracked and leak under negative pressure but not positive pressure; 2. Damaged sections in the piping; 3. Loose connections during vacuum extraction causing leaks or a faulty vacuum pump; 4. Failure to use the repeated vacuum extraction method during the process. The functions of car air conditioning are: 1. Cooling, heating, ventilating, and purifying the air inside the car; 2. Providing a comfortable environment for passengers, reducing driver fatigue, and enhancing driving safety. Maintenance methods for car air conditioning include: 1. Regularly cleaning the air vents; 2. Timely maintenance of the air conditioning condenser; 3. Prompt cleaning or replacement of the air filter. Proper usage methods for air conditioning: 1. Turn off the air conditioning when driving at low speeds; 2. Avoid smoking inside the car when the air conditioning is on; 3. Turn off the engine before shutting down the air conditioning; 4. Immediately activate the internal circulation when entering the car in summer.
The car's air conditioning vacuum is not being properly evacuated, and I suspect the main reason might be a leak in the system. For example, leaks could occur at the AC pipe joints, due to aging or damaged rubber hoses, or worn-out seals, all of which allow air to seep in, making it difficult to achieve the desired vacuum level. Additionally, the vacuum pump itself might be faulty, either due to insufficient power or a clogged filter, resulting in inadequate suction. Moreover, if the vacuuming time is too short, it won’t be effective—experts recommend at least 15 minutes to effectively remove moisture and air. Excessive moisture in the system can also hinder vacuum formation, leading to inefficiency. I once encountered this issue, and after inspection, it turned out to be a loose hose connected to the vacuum gauge—tightening it resolved the problem. In short, this issue affects cooling performance, increases power consumption, and may even damage the compressor. It’s advisable to visit a professional shop to test the system’s sealing with a leak detector. Regular maintenance checks for hose aging can help prevent such troubles.
I've experienced the issue of incomplete AC vacuum evacuation as a car owner. The simplest explanation is often improper operation. For instance, failing to close valves properly during evacuation or having loose vacuum pump connections allows continuous air ingress. In my case, after ten minutes of evacuation, the vacuum gauge reading kept fluctuating—turned out the leak detection port valve in the AC system was leaking. Insufficient time is another factor; in humid winter conditions, even 30 minutes might be inadequate. A dirty vacuum pump filter also reduces efficiency, compromising overall performance. While seemingly minor, this issue causes real headaches: sluggish cooling, reduced refrigerant effectiveness, and increased fuel consumption. My advice: prioritize checking tools and connection points. If DIY attempts fail, consult a professional technician immediately to avoid wasting money. Accumulated moisture in the AC system can lead to component corrosion over time. Pay extra attention during seasonal maintenance to prevent future troubles.
