Why is the car air conditioning cooling down very slowly?

[BeauLynn]

Here are the reasons why the car air conditioning cools down very slowly: 1. Excessive refrigerant causing insufficient cooling. This usually occurs due to overcharging of refrigerant during maintenance, as there is a specific proportion requirement for refrigerant volume in the air conditioning system. 2. Insufficient refrigerant causing a lack of cooling. The main cause of insufficient refrigerant is usually leakage in the system. 3. Excessive impurities in the refrigerant and lubricating oil, causing minor blockages and insufficient cooling. If there are too many contaminants in the refrigerant and lubricating oil throughout the air conditioning system, the filter screen will inevitably become clogged, reducing the flow capacity of the refrigerant, increasing resistance, and decreasing the amount of refrigerant flowing to the expansion valve, leading to insufficient cooling. 4. Moisture infiltration in the air conditioning refrigeration system causing insufficient cooling. There is a component in the refrigeration system called the dryer (or receiver), whose main task is to absorb moisture from the refrigerant to prevent excessive moisture from reducing cooling capacity. 5. Air in the system is another cause of insufficient cooling. Once air enters the air conditioning system, it will increase the pressure in the refrigeration lines, and poor refrigerant circulation will also lead to insufficient cooling. 6. Reduced heat dissipation capacity of the condenser will also lead to decreased cooling performance of the air conditioning system. 7. Other reasons, such as low power supply voltage causing reduced electromagnetic clutch engagement or oil contamination between the clutch pressure plate and the pulley, can result in "slipping" phenomena similar to a loose drive belt.