What Causes the Air Conditioning to Stop Cooling After Long Drives?

[SanColeman]

The reasons why the air conditioning stops cooling after long drives are as follows: 1. Refrigerant Issues: Sometimes the problem lies with the refrigerant in the car's air conditioning system. 2. Filter Blockage: Excessive contaminants in the refrigerant or refrigeration oil can clog the filter screen, reducing cooling efficiency, increasing resistance, and decreasing the flow of refrigerant to the expansion valve, leading to poor cooling. 3. Desiccant Saturation: The air conditioning system includes a dryer tank designed to absorb moisture from the refrigerant and prevent excessive moisture from reducing cooling capacity. When the desiccant in the dryer tank becomes saturated, it can no longer filter out moisture. 4. Loose Compressor Drive Belt: Sometimes, the air conditioning fails to cool because the compressor's drive belt is too loose, or the condenser's heat dissipation capacity has declined, reducing the air conditioning's cooling performance.