If your A/C is new and installed by a SOB dealer like mine was, you might find that they did not fill the empty rivet holes left from the old A/C unit. I had to loosen and lift up the new unit to find about 6-8 holes hidden from view that allowed water to leak. And, for some reason it didn't leak all the time. Also, the older units like mine don't have A/C drain tubes like many of you are thinking. Hope you stay dry this weekend.
Cory, Angie, and 'Lucy'
1966 Sovereign International
2003 Black Chevy Silverado w/q-steer