What causes a car's air conditioning to suddenly stop cooling?

[OJoshua]

The reasons why a car's air conditioning suddenly stops cooling are: 1. Insufficient or too little refrigerant: It may be caused by a slight leak of refrigerant; 2. Too much refrigerant: The proportion of refrigerant in the air conditioning system is strictly required. If the proportion is too high, it will affect the heat dissipation. Similarly, if too much cooling oil is added during maintenance, the heat dissipation of the refrigeration system will also decrease; 3. The drive belt of the car air conditioning compressor is loose: Car refrigeration relies on refrigerant, and the transmission of refrigerant depends on the air conditioning compressor. The drive belt is an important moving part that drives the air conditioning compressor. If the drive belt is loose, the compressor will slip when working, leading to a decrease in transmission efficiency, a drop in compressor speed, and a reduction in the delivery of compressed refrigerant, resulting in the car air conditioning not cooling.