What Causes a Car's Air Conditioning to Suddenly Stop Cooling?

[HarmonyAnn]

Possible reasons for a car's air conditioning suddenly failing to cool include: 1. Excessive refrigerant causing insufficient cooling: Overcharging of refrigerant typically occurs during maintenance, as the proportion of refrigerant in the air conditioning system must meet specific requirements. If the proportion is too high, it can affect heat dissipation—greater heat dissipation leads to higher cooling capacity, while reduced heat dissipation results in lower cooling capacity. 2. Insufficient refrigerant due to low levels: The primary cause of refrigerant shortage is usually minor leaks in the system. If there's insufficient refrigerant in the air conditioning system, the amount sprayed into the evaporator through the expansion valve will decrease, reducing the heat absorbed during evaporation in the evaporator. Consequently, the cooling capacity will also decline.