One problem related to power window has been reported for the 2004 Chevrolet Suburban. The most recently reported issues are listed below.
I have a 2004 Suburban with 60k miles. About 1 months ago, the rear window began making a whistling noise while driving. When I inspected it I found that the hinge was separating from the window. I have tried to go through gm with no avail. Their answer is "it shouldn't have happened", but they are not going to do anything about it.