What are the reasons for a car air conditioner not cooling properly?

[JuliannaAnn]

There are several reasons why a car air conditioner may not cool effectively: 1. Excessive refrigerant: Too much refrigerant can reduce cooling efficiency. If the refrigerant and compressor oil contain excessive impurities, minor blockages can occur, leading to insufficient cooling capacity. 2. Insufficient refrigerant: A lack of refrigerant results in inadequate cooling. A dirty condenser or a loose compressor drive belt can also cause the air conditioner to blow warm air. 3. Excessive impurities: If the refrigerant and compressor oil contain too many impurities, minor blockages can form, reducing cooling capacity. If the entire air conditioning system has excessive contaminants in the refrigerant and compressor oil, the filter screen will likely become clogged, decreasing refrigerant flow, increasing resistance, and reducing the amount of refrigerant reaching the expansion valve, thereby causing insufficient cooling.