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have you added leak tracer dye?
its likely the evaporator, if you have access to a refrigerant leak detector (sniffer) I would start there.. It can hurt to fill it full of dye one more time an reinspect...check the condenser and compressor closely along with the lines and the accumulator..But if you charged it with dye and looked over the whole system I would bet the evaporator core is leaking
no usually the dye will stay on the core...sometimes it will drip out of the drain tube ...but not always...it must be a serious leak if you hear it...what area is the leak
look at the condenser closely if the hissing is up front you would think the dye would soak it
is very possible you purchased a defective condensor
pull it and examine it more dye? some shops will use nitrogen or compressed air so they don't waste refigerant