What are the reasons for poor cooling effect of car air conditioning?

[StRuth]

Reasons for poor cooling effect of car air conditioning: refrigerant leakage, insufficient pipeline pressure; reduced heat dissipation capacity of the condenser; blocked air ducts, dirty air conditioning pipelines; prolonged use of external circulation. Below is a related introduction to car air conditioning: Introduction to car air conditioning: Car air conditioning is composed of a compressor, condenser, throttling element, evaporator, fan, and necessary control components. It is an air conditioning system used to regulate the temperature and humidity inside the car, providing a comfortable environment for the driver. Working principle: When the compressor is working, it sucks in low-temperature and low-pressure gaseous refrigerant from the evaporator. After compression, the temperature and pressure of the refrigerant increase, and it is sent to the condenser. In the condenser, the high-temperature and high-pressure gaseous refrigerant transfers heat to the outside air passing through the condenser and liquefies, turning into a liquid. When the liquid refrigerant flows through the throttling device, its temperature and pressure decrease, and it enters the evaporator. In the evaporator, the low-temperature and low-pressure liquid refrigerant absorbs heat from the air inside the car passing through the evaporator and evaporates, turning into a gas. The gas is then sucked into the compressor for the next cycle.