I just purchased a 2005 GMC Yukon Denali 6.0L V8 and the rear windows will not go down at all! I can hear the motor kick on when I go to roll them down but nothing happens at all...Tried lubricating the window as much as I can without removing the door panel, and I've also tried pushing down on the windows with my hands while pushing the button to roll down window, but still no movement! Has anybody else had this issue!?