the part of the airconditional that holes the freeon has a whole in it..
air conditional leaks on 1995 BMW 540i
The air conditioning system has many components, the condenser (in front of the radiator) the evaporator behind the dash the compressor ,drier and its related hoses. To repair any part of the system the system has to be evacuated the refrigerant stored, the system flushed free of contaminants and the system refilled to the correct pressure. Only skilled personnel should work on the system. Cost will depend on what is damaged.