How to Determine Refrigerant Leakage in Car Air Conditioning?

[LaOlive]

Here are the methods for detecting leaks in car air conditioning systems: 1. Visual Inspection: When oil traces are found at a certain point in the system, that area may be the leak point. Visual inspection is simple and cost-free, but it has significant limitations. Unless there is a sudden large fracture in the system or the leakage involves a colored liquid medium, visual inspection often cannot pinpoint the leak, as most leaks are very subtle, and many parts of the car air conditioning system are nearly impossible to see. 2. Soap Water Leak Detection: Fill the system with nitrogen, then apply soap water to various parts of the system. Bubbles will appear at the leak points. This is the most common leak detection method used by roadside repair shops. However, due to limited reach of human arms and visibility, many leak points remain undetected. 3. Nitrogen Water Leak Detection: Fill the system with nitrogen and immerse it in water. Bubbles will indicate leak points. This method is essentially the same as the soap water method. Although low-cost, it has significant drawbacks: water used for detection can enter the system, causing corrosion of internal materials. Additionally, high-pressure gas may cause further damage to the system, and the labor intensity during detection is high, increasing maintenance costs. 4. Halogen Lamp Leak Detection: Light the detection lamp and hold the air tube of the halogen lamp. When the tube opening is near a leak point, the flame color turns purple-blue, indicating a significant leakage. This method involves open flames, which are not only dangerous but also produce harmful gases when combined with refrigerant. Moreover, it is difficult to accurately locate the leak point.

[VioletAnn]

Hey, last time my car's AC suddenly stopped cooling, I knew it might be a leak. Start by checking the symptoms: the vents blow warm air instead of cold, the compressor frequently cycles on and off with an abnormal buzzing sound, or insufficient cooling leads to reduced condensation on the roof. Then pop the hood and inspect the AC lines and connections for oil stains or wet spots, as refrigerant carries lubricant that leaves marks. If you're doing it yourself, soapy water can help: dilute some dish soap and spray it on the pipes—if bubbles appear, that's the leak. Remember not to sniff directly, as refrigerant is irritating and may cause headaches. If you find a leak, don't delay—get it fixed at a professional shop immediately, or system pressure could damage the compressor. Regularly protect the lines from aging and avoid hitting sharp objects.