What is the reason why the Kia K3 air conditioner sometimes cools and sometimes does not?

[Amara]

The main reasons why the air conditioner sometimes cools and sometimes does not: 1. Too much refrigerant: When the car is driving at high speed, the rotation speed is fast, the pressure of the refrigeration system is high, the compressor stops, and the air conditioning cooling stops. When the car is driving at low speed, the rotation speed is slow, the pressure of the refrigeration system is low, the pressure switch closes, the compressor works, and the cooling resumes. Therefore, the cooling is intermittent. 2. Lack of Freon: The reason for this situation is generally a leak in the pipeline of the air conditioning system. At this time, a small amount of water can be dripped at the joint of the car's refrigerant pipeline, and bubbles will appear at the leak. Find the leak location and repair it, then go to a professional car repair shop or 4S shop to add Freon. 3. Aging of the air filter element: If the car air filter element has been used for a long time, it may be the problem of the air filter element.