What is the reason why the Audi air conditioner sometimes cools and sometimes does not?

[Allison]

The reason why the Audi air conditioner sometimes cools and sometimes does not is due to an issue with the amount of refrigerant. The specific reasons are as follows. Insufficient cooling caused by excessive refrigerant: Excessive refrigerant is usually caused by overfilling during maintenance, as the proportion of refrigerant in the air conditioning system has specific requirements. If the proportion is too high, it can affect heat dissipation, meaning more heat dissipation leads to greater cooling capacity; conversely, less heat dissipation results in reduced cooling capacity. Similarly, adding too much cooling oil during maintenance can also decrease the system's heat dissipation. Insufficient cooling caused by low refrigerant: The main reason for insufficient refrigerant is typically minor leaks in the system. If there is insufficient refrigerant in the air conditioning system, the amount of refrigerant sprayed into the evaporator from the expansion valve will also decrease. As a result, when the refrigerant evaporates in the evaporator, the amount of heat absorbed will decrease, leading to reduced cooling capacity.