What is the fault when the car air conditioner has high low pressure and low high pressure?
3 Answers
It may be an air conditioning compressor failure. Here are the specific details: 1. Specific reason: When the car air conditioner exhibits low low pressure and normal high pressure, excluding natural causes like cold weather, it is generally due to a malfunction or damage in the air conditioning compressor causing abnormal pressure. 2. Solution: For the issue of normal low pressure and low high pressure caused by compressor damage, it is usually resolved by replacing the air conditioning compressor. However, due to the cramped and narrow space where the car air conditioning compressor is located, disassembly is very inconvenient. Additionally, temporary recovery of the air conditioning refrigerant is required, making the task quite extensive. Therefore, it is recommended to visit a 4S shop for professional handling.
I often encounter this issue when repairing cars: the car AC has high low-side pressure and low high-side pressure. The cause is usually internal compressor problems, such as leaking or worn valves, allowing refrigerant to escape without proper compression. When low pressure is too high and high pressure too low, cooling efficiency drops significantly, blowing only lukewarm air. Immediate action is required, or the compressor may fail completely. During diagnosis, first check the compressor's compression efficiency to confirm abnormal pressure readings. Based on experience, most cases require either compressor replacement or seal repairs—avoid continued operation to prevent further damage. This issue is particularly frustrating in summer when lack of cooling makes the cabin unbearable. It’s best to visit a professional repair shop promptly to eliminate safety risks.
My car's AC has had this issue for some time now - the low-pressure gauge reading stays high while the high pressure remains low. When driving, the cold air isn't cooling at all. The mechanic said the compressor might be leaking or the valves could be clogged. The refrigerant isn't being compressed evenly, causing pressure imbalance. This affects the overall AC performance, and parts need replacement. I suggest first checking the system for leaks and testing the refrigerant levels. The repair isn't too expensive, but don't delay it, or the compressor damage will cost more time and money. Driving without AC in hot weather is particularly uncomfortable, especially when traveling with kids - comfort and safety must be ensured.
