Why does the Audi A4 air conditioning suddenly stop cooling?

1 Answers
NatalieLynn
07/29/25 4:27pm
Here are the reasons and solutions for the Audi A4 air conditioning not cooling: 1. Too much or too little refrigerant can cause the car air conditioning to stop cooling. Excessive refrigerant is usually caused by overfilling during maintenance, as the proportion of refrigerant in the air conditioning system must meet certain requirements. If the proportion is too high, it can affect heat dissipation, meaning more heat dissipation results in greater cooling capacity; conversely, less heat dissipation results in lower cooling capacity. 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, and the heat absorbed during evaporation in the evaporator will consequently decrease, leading to reduced cooling capacity. Solution: If there is too much refrigerant in the car air conditioning, some can be slowly released from the maintenance port on the low-pressure side of the system. If there is insufficient refrigerant, it should be added. However, when adding refrigerant, note that if adding from the low-pressure side, the refrigerant bottle must not be placed upside down, and if adding from the high-pressure side, the engine must not be started. 2. Loose compressor drive belt. If the car air conditioning compressor drive belt is loose, the compressor may slip during operation, reducing transmission efficiency and thus decreasing the cooling effect. Solution: Check if the drive belt is broken or loose, if there is noise inside the compressor, and if the compressor clutch is slipping.
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