What causes high low pressure and normal high pressure in the Audi C7's air conditioning system?

[DeEzra]

Audi C7 air conditioning system exhibiting high low pressure and normal high pressure is typically caused by a faulty or damaged expansion valve. Here are the specific details about the expansion valve: 1. Symptoms of a clogged expansion valve: When the car's air conditioning is turned on, it fails to cool properly. Measuring the pressure in the air conditioning lines with a pressure gauge will show excessively high high pressure and excessively low low pressure, indicating expansion valve failure. 2. Symptoms of a damaged expansion valve: The low-pressure pipe doesn't feel cold to the touch, the dryer and condenser may frost over, both high and low pressures become abnormal, and the high-pressure pipe temperature becomes irregular. 3. Function of the expansion valve: The expansion valve serves as a throttling device. High-temperature, high-pressure liquid refrigerant passes through the expansion valve's throttle orifice, becoming low-temperature, low-pressure mist-like hydraulic refrigerant, creating conditions for refrigerant evaporation.