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I'd also say a clogged sunroof drain as well and highly doubt your Esky rack has anything to do with the problem........
You could try blowing some air thru there via a compressor but I would not go full blast with it. I also believe that there are nutserts that are welded to the roof and that is what the mounting bolts attach too-at least it was like that on my Envoy when I took the rack off-I can't imagine the Yukon/Tahoe being any different. Best of luck. Report back.
-J
Macho, what was the outcome of this??
How about if water comes in on the roof mounted console , the one where it has the buttons for the sunroof, rear hatch.....