leaks a leak...and it could be anywhere in the system. There is no specific place for a leak. In any case you need a system pressure test to check for and repair the leak. Could be a very simple leak, like a seal or a shrader. But could also be something more expensive, like the compressor or evaportor. To have it leak checked is not that expensive, and they can then give you a proper repair price. AC is a luxury...expect to pay for it....I was once told at school by the AC teacher that the average AC repair bill is $500 -$600 dollars ( Canadian ). Get something like a compressor, or evap and it runs up pretty easy.
