What is the reason why jeep Guide air conditioner doesn't cool?

Cause of air conditioning failure of Jeep Guide: 1, lack of Freon: too little Freon. 2. There is something wrong with the compressor: there is something wrong with the compressor or expansion valve, resulting in abnormal pressure in the air conditioning system. 3. There is something wrong with the refrigeration system of the air conditioner: there is something wrong with the refrigeration system of the air conditioner. The condenser and water tank are seriously blocked, which leads to poor refrigeration, and the air conditioner does not cool because of high temperature. The related information is as follows: the air conditioning refrigeration of the guide rail is controlled by the AC switch on the control panel of the air conditioning manipulator. Turn on the AC switch of the air conditioner, turn on the electromagnetic clutch of the compressor and start working. The refrigerant compressed by the compressor becomes high-temperature and high-pressure gas, radiates heat to the front condenser of the vehicle, condenses into high-pressure liquid after heat storage, filtration and drying, and then becomes low-pressure liquid after throttling and depressurization by the expansion valve, and finally evaporates and absorbs heat at the evaporator in the vehicle to realize refrigeration. Heating is an AC switch to turn off the hot water from the engine water tank to the radiator fan in the heater, and the air from the radiator is hot air, thus realizing heating.