Why is the cold air from a diesel car's air conditioner not cold?

[VonPresley]

The reasons why the cold air from a diesel car's air conditioner is not cold are as follows: 1. Too much refrigerant: This leads to a decrease in cooling efficiency. 2. Too little refrigerant: Insufficient refrigerant causes the condenser to become dirty, and a loose compressor drive belt can also result in the air conditioner not cooling properly. 3. Excessive impurities: If there are too many impurities in the refrigerant and the refrigeration oil, minor blockages can occur, leading to insufficient cooling capacity. If there is excessive dirt in the refrigerant and refrigeration oil throughout the entire air conditioning system, it will inevitably clog the filter screen of the filter, reducing the cooling passage capacity and increasing resistance. This also means less refrigerant flows to the expansion valve, resulting in insufficient cooling capacity.