07 Tahoe - sunroof drainage channel

[ted_grevers]

Does anyone know where the outlet is for the sunroof drain on the 07 Tahoe? Ours seems to block after a rainstorm, then when the defroster or AC is running, there is a bubbling sound that comes from the passenger side, front corner of the sunroof opening.

Does anyone know where the drainage channel runs, and exits the vehicle?

I did a search, and found references to the 2001 and 2002 Tahoe, but nothing for the GMT900 platform.

thanks.