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What Are the Reasons for Slow Cooling in Car Air Conditioning?

1 Answers

BrooklynAnn

07/29/25 2:13pm

Reasons for slow cooling in car air conditioning may include insufficient refrigerant, moisture infiltration into the air conditioning system, and reduced heat dissipation capacity of the condenser. Additionally, aging compressors and belts, clogged refrigerant pipelines, long-term failure to replace the air conditioning system's filters, and malfunctioning cooling fans can also contribute to slow cooling in car air conditioning. Specific reasons for slow cooling in car air conditioning: Insufficient refrigerant due to low levels: The primary cause of insufficient refrigerant is usually a leak 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. Consequently, when the refrigerant evaporates in the evaporator, the amount of heat absorbed will be reduced, leading to a decline in cooling capacity. Moisture infiltration into the air conditioning system: A component in the refrigeration system called the dryer (or receiver-drier) is responsible for absorbing moisture from the refrigerant to prevent excessive moisture, which can reduce cooling capacity. However, when the desiccant in the dryer becomes saturated, it can no longer filter out moisture. As the refrigerant passes through the expansion valve's throttle orifice, the pressure and temperature drop, causing the moisture in the refrigerant to freeze in the small orifice. This can obstruct the refrigerant flow, increase resistance, or even block it completely. Reduced heat dissipation capacity of the condenser: Due to varying operating environments, the condenser located in front of the car engine may become covered with oil, dirt, or debris, reducing its heat dissipation capacity. Additionally, issues with the cooling fan, such as a loose drive belt, reduced fan speed, or high-speed problems, can also impair the condenser's heat dissipation. The solution is to clean the condenser surface with a soft brush and promptly address any fan malfunctions. Reduced heat dissipation capacity of the condenser: Due to varying operating environments, the condenser located in front of the car engine may become covered with oil, dirt, or debris, reducing its heat dissipation capacity. Additionally, issues with the cooling fan, such as a loose drive belt, reduced fan speed, or high-speed problems, can also impair the condenser's heat dissipation. The solution is to clean the condenser surface with a soft brush and promptly address any fan malfunctions.

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