Ok, my girlfriend has been telling me about this noise she is hearing in her Envoy, and I even posted on here about it earlier. Until now, I had not heard the noise, so I just had a general description. Tonight, I heard it. It kind of sounds like a bunch of bees, or flies buzzing, and it is coming from the rear hatch area, behind the panel on the passenger side. Can anyone tell me what is behind that panel that could be making a noise like this? Oh yea, I mistakenly listed her Envoy as an 05, its an 06. Thanks for your help....