What are the potential consequences of an excessively open automotive AC expansion valve?

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An excessively open expansion valve manifests as higher-than-normal air temperature from the vehicle's cooling vents. The low-pressure side pressure becomes elevated (normal high pressure should be 15-20 kg/cm², low pressure 2-3 kg/cm²). Increased suction pressure leads to higher suction temperature, which in turn raises the discharge temperature. Excessively high discharge temperature poses significant risks to compressor lubricating oil and coil insulation, ultimately causing compressor damage. Below is additional relevant information: Automotive AC: Officially termed automotive air conditioning system. It regulates and maintains optimal cabin temperature, humidity, air purity, and airflow to provide passenger comfort, reduce travel fatigue, and create favorable driving conditions that significantly contribute to road safety. Typically consisting of refrigeration, heating, and ventilation systems, this integrated unit maximizes limited vehicle interior space with simple structure and user-friendly operation, representing the internationally prevalent modern automotive AC system.