I have a new 2007 Corolla. Since the day I bought it, the rear (very back window) makes a creaking, rattling, ticking sound. Frustratingly, the noise is intermittent. Sometimes it happens and goes on for hours, othertimes under identical conditions it does nothing. I've had it to the dealer 5 times and they've removed all the plastic in the rear and reinstalled it, and most recently removed and reinstalled the entire window. But the noise persists. It sounds like it is coming from where the window meets the frame top left or top center. Often the noise begins when the car goes over a small bump while turning. Does anybody have any insight? I know it's a small stupid problem, but the noise is very annoying and I'm getting sick of taking the car back to the dealer. Thanks in advance!