Why does the BMW 525li air conditioning not cool?

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BMW 525li air conditioning not cooling is due to lack of refrigerant. Here is extended information about air conditioning: 1. Meaning: The air conditioning system mainly compresses gaseous refrigerant into high-temperature and high-pressure gas through the compressor, which then flows through pipes into the condenser. Inside the condenser, it dissipates heat and cools down through the cooling fan, condensing into high-pressure liquid refrigerant that flows out. 2. Refrigerant: The high-pressure liquid refrigerant enters the dryer reservoir through pipes, where it is dried and filtered before flowing into the expansion valve for throttling. Its state changes dramatically, turning into low-temperature and low-pressure liquid refrigerant that enters the evaporator. Inside the evaporator, it absorbs heat from the air flowing through, lowering the air temperature and blowing out cold air, creating a cooling effect. The refrigerant itself evaporates into low-temperature and low-pressure gaseous refrigerant due to absorbed heat, which is then sucked into the compressor through pipes for compression. As long as the compressor works continuously, the refrigerant circulates continuously in the air conditioning system, producing a cooling effect. When the compressor stops working, the refrigerant in the system stops flowing, and no cooling effect is produced.