What is the problem with Audi a8 air conditioner without refrigeration?

Check the refrigerant pressure of the air conditioner. The engine is equipped with an electronic fan. The electronic fan in front of the condenser plays an auxiliary heat dissipation role. The fan and its power output stage are designed as an assembly. Check whether the electronic fan rotates and whether there is a high gear. The rotational speed of the electronic fan is controlled by the coolant temperature at the outlet of the water tank and the refrigerant pressure of the air conditioner, and gradually decreases with the increase of the driving speed. Connect the air conditioning pressure gauge on the air conditioning pipeline, start the engine and check whether the compressor works. Touch the temperature of the low-pressure pipeline of the air conditioner by hand to see if the expansion valve is blocked. As for the outlet temperature sensor of the water tank, its signal data is used to control the electronic fan. When the water temperature is high, the air conditioner will not be cold. Check thermostat and water temperature sensor, and clean water tank. As for the thermostat valve you mentioned (warm air tank temperature control diverter valve), it is located at the pipeline of warm air tank. Check whether the temperature control diverter valve of the warm air tank works abnormally, which will lead to abnormal hot water flow control in the warm air tank. If the warm air temperature is too high, the air conditioner will not cool. Secondly, check whether the air conditioning panel temperature sensor and computer are faulty. It is recommended to go to 4s shop to check the above problems.