What are the symptoms of a clogged automotive expansion valve?

[StMargaret]

It will cause the air conditioning compressor to operate under increased load, resulting in a situation where the AC produces cool air but fails to blow out. Here are the relevant details: 1. Cooling effect: The expansion valve converts medium-temperature, high-pressure liquid refrigerant into low-temperature, low-pressure wet vapor through throttling to achieve cooling. It controls valve flow based on temperature changes at the evaporator outlet, preventing insufficient utilization of evaporator surface area and compressor knocking. 2. Function: The expansion valve has two main functions - throttling and controlling refrigerant flow. Thermal expansion valves can be categorized as internally or externally balanced based on their balancing method. In automotive refrigeration systems, the expansion valve is one of the four major components, with the other three being the compressor, condenser, and evaporator.