What causes the Volkswagen Phideon's air conditioning to stop cooling when the engine exceeds 2000 RPM?
2 Answers
The reason why the Volkswagen Phideon's air conditioning stops cooling when the engine exceeds 2000 RPM: There is an issue with the refrigerant in the car's air conditioning system. Sometimes, excessive impurities in the refrigerant or the presence of too much debris in the refrigeration oil can clog the filter screen of the filter, reducing the cooling effect and increasing resistance. This also decreases the flow of refrigerant to the expansion valve, resulting in the air conditioning not cooling properly. Drying tank: The car's air conditioning refrigeration system includes a drying tank, whose main function is to absorb moisture from the refrigerant and prevent excessive moisture from reducing the cooling capacity. When the desiccant inside the drying tank reaches saturation, it can no longer effectively filter out moisture. Compressor drive belt too loose: Sometimes, the car's air conditioning may not cool properly because the compressor's drive belt is too loose. Another possible cause is reduced heat dissipation capacity of the condenser, leading to a decline in the air conditioning's cooling performance.
I own a Volkswagen Phideon, and the air conditioning starts to underperform when the engine reaches 2000 RPM. I've thought about this issue. The core reason might be that the compressor is overloaded at high RPM, with internal clutch wear or unstable operation leading to cooling interruptions. If the compressor lacks sufficient lubrication or has design flaws when the RPM surges, it's prone to malfunction above 2000 RPM. Additionally, Volkswagen's cooling system sometimes has protective strategies, such as automatically reducing compressor power to save energy when the engine RPM is high. When the RPM increases, the air conditioning pressure also rises, but if the compressor can't keep up, problems arise. If there's a slight refrigerant leak, the issue becomes more apparent under high pressure, affecting performance. It's recommended to visit an authorized service center as soon as possible to check the compressor operation and system sealing, to avoid any issues on the highway.
