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$300 USD? That sounds very high. My A/C guy diagnosed the problem for $20.00 and I ordered the expansion valve from Rock Auto for about $20.00. When it arrived I went back to the A/C guy and for another $60.00 he vacuum drained the system, replaced the valve, pressure tested with nitrogen and refilled to spec with R134a. So all in it cost me about $100.00 . . . . CANADIAN! Which is about $75.00 USD.
This guy is a certified HVAC Tech who has a day job in the industry and does side jobs, like mine, in his garage. All legit and following all safety and environmental protocols.
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