From what I've read, normal expansion valves are only affected by the ratio of internal temp / pressure to external temp / pressure. (mechanics.stackexchange.com)
Is there some test I can have a mechanic do to verify that the AC expansion valve is broken and needs to be replaced? (mechanics.stackexchange.com)
Includes A / C Compressor and Clutch, A / C Receiver Drier with Hose Assembly, A / C Expansion Valve, A / C Compressor Oil Additive, A / C Service Valve Cap, A / C System Flush, A / C System Seal Kit, A / C System Valve Core and Cap Kit, R134A Refrigerant Oil (carparts.com)