Ok, there are many places it can leak from - compressor seals at front or rear of it, condenser, expansion valve, evaporator, receiver/drier, high pressure or low pressure ac line, high or low pressure service port, or one of the seals at any of the line connections.
There is simply no way to tell you where it is leaking. It REQUIRES hands on testing. The system needs to be filled with refrigerant and florescent dye and then a black light used to trace the dye that will leak out to its source and at that time do the repair.
Cost range will be from $200 or so for a line up to $1200 for the evaporator.
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