I finally found the approximate area of the leak. It seems that the refrigiant is leaking from around the radiator area. Does that means it's leaking from the condenser core? I loosely checked the lines, and they seem to be on snugly and no sign of visible leaks. The only place that I can visibibly see leak is from the radiator, and it's hissing from right around that area too. If it turns out to be the condenser core, how much will it cost for the part?