I charged my 1986 V6 with the fluorescent dye and using uv light and glasses I have been trying to locate the leaking point in my air conditioning system. I used this technique some years ago to locate the leaking O rings where the hoses connect under the air cleaner area. I have searched the compressor, under dash and engine compartment w/o finding any other dye leaking. I had charged the system a couple of weeks ago and it blew cold air, now just ambient air. Any ideas for the usual suspects? Thanks.
Mine leaked out at the compressor shaft seal behind the clutch. I just kept refilling it (back in the days when R12 was cheap and plentiful) until the seal finally wore out enough for me to find the leak.
Compressor shaft seal is the most likely place, followed by compressor hose connections. My leak ended up being the worst possible place, the under car lines. The line had corroded, and leaked where it attached to a bracket under the front compartment tub.