Went to an A/C check-up today and been told Freon is leaking from everywhere, condenser, compressor, hoses and EVAPORATOR. They use somekind of equipment making beeping sound to detect the leak. How accurate is this test? It is going to cost a lot to repair, the guy even does not suggest me to fix it. This is very very frustrate to hear while I am planning on some other repair job on this car (89 300E/120,000 miles). Any advice would be very appreciated.