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Hi, welcome to Just Answer. My name is ***** ***** I look forward to helping you! The issue is with refrigerant flow, either a leak or the refrigerant cannot flow to the evaporator. I suspect there may be a restriction to the evaporator, usually a solder joint that was sealed accidentally. When you pressurized the system with nitrogen, did you pressurize one side to see if it would equalize or pressurize both sides together?
No, you likely have a restriction. Check the solder joints, you will probably find one plugged.