What is the problem with the Audi A8 air conditioner not cooling?

[McMatteo]

Here are the reasons why the air conditioner is not cooling: 1. Insufficient or too little refrigerant: When the air conditioner is running normally, if you observe continuous and slow bubbles in the sight glass above the dryer, it indicates insufficient refrigerant. If there are obvious bubble flips, it means the refrigerant is severely insufficient. 2. Too much refrigerant: Excessive refrigerant can also cause the air conditioner to not cool. This is because the proportion of refrigerant in the air conditioning system has specific requirements. If the proportion is too high, it will affect heat dissipation. Similarly, adding too much cooling oil during maintenance can also reduce the heat dissipation of the refrigeration system. 3. Loose drive belt of the car air conditioner compressor: Car cooling relies on refrigerant, and the transmission of refrigerant depends on the air conditioner compressor. The drive belt is an important moving part that drives the compressor. If the drive belt is loose, the compressor will slip during operation, leading to reduced transmission efficiency, decreased compressor speed, and reduced delivery of compressed refrigerant, resulting in the car air conditioner not cooling.