I am working on two of our vehicles that continue to loose AC Refrigerant and I have put dye in both of these vehicles and am finding no where the dye is coming out.... I have a "sniffer" and have found that thing to be nearly useless because it is always giving me false positives................ where else should I look.... I hate AC issues.......................

Okay, we'll need to know what vehicles, and what . We'll also need the issues posted in the appropriate forums (If it is a Buick, post in the "Buick" forum, Oldsmobile in the "Oldsmobile" forum, etc.). Please include a little more detail on what is and isn't working.

Since you have numerous vehicles, yes it would be best to open two separate new threads in correct sections.
In new threads under Title, Please list Year & vehicle model.
Then add better descriptions regarding what issues & diagnostics you have performed.
Thanks.