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Have you tried to measure the pressure on low and high pressure ports? You can also try to block hot water flow by clamping the hose going into the car. Touch the expansion pipe under the hood, is it cold? It is not difficult to diagnose AC.
It is not unusual for AC to fail suddenly. I have a compressor failed on me all of a sudden when the metal valve inside the compressor broke and jammed the unit. Luckily the kilma relay will kill the AC when it senses the shaft is not turning. Your problem doesn't seem to be the compressor. Good luck.
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