What are the reasons for the BMW 740's air conditioning not cooling?

[MacPreston]

There are several reasons why the BMW 740's air conditioning may not be cooling: 1. Excessive refrigerant: This can lead to reduced cooling efficiency. If the refrigerant and the lubricating oil contain too many impurities, minor blockages may occur, resulting in insufficient cooling capacity. 2. Insufficient refrigerant: A lack of refrigerant can cause inadequate cooling. A dirty condenser or a loose compressor drive belt can also lead to poor cooling performance. 3. Excessive impurities in the refrigerant and lubricating oil: Minor blockages can cause insufficient cooling. If there are too many contaminants in the refrigerant and lubricating oil throughout the air conditioning system, the filter screen is likely to become clogged, reducing the flow of refrigerant, increasing resistance, and decreasing the amount of refrigerant reaching the expansion valve, thus leading to insufficient cooling capacity.