Put uv dye in my car ac will I be able to find the leak anywhere does it always work?

This is my first time doing this I had full ac and i hear the knocking now and no more Freon so I out leak detector inside it so it no inspect my car or I take it to a shop will they be able to find the leak no matter where it is?

FlagMichael2019-04-13T23:56:19Z

If the evaporator is leaking it won't show up, except maybe on the drain tube.

Anonymous2019-04-13T20:22:10Z

Don't keep wasting Freon, it's bad for the atmosphere. Take it to a certified A/C workshop where they can fix the leak before regassing it.