Why is the Citroen C4L air conditioning not cooling?

[Hazel]

Citroen C4L air conditioning not cooling is due to lack of refrigerant. The following is a related introduction to car air conditioning: 1. Air conditioning layout: Different types of air conditioning systems have different layout methods. Currently, cars widely adopt an integrated heating and cooling air conditioning system. Its layout form involves assembling the evaporator, heater radiator, centrifugal fan, and control mechanism together, known as the air conditioning unit assembly. 2. Air conditioning composition: Modern air conditioning systems consist of a refrigeration system, heating system, ventilation and air purification devices, and a control system. Car air conditioning generally mainly includes a compressor, electronically controlled clutch, condenser, evaporator, expansion valve, receiver-drier, pipelines, condenser fan, vacuum solenoid valve, idle speed controller, and control system. Car air conditioning is divided into high-pressure and low-pressure pipelines. The high-pressure side includes the compressor output side, high-pressure pipelines, condenser, receiver-drier, and liquid pipelines; the low-pressure side includes the evaporator, accumulator, return pipelines, compressor input side, and compressor oil sump.