ltznc
New Member
I have a 2007 LTZ that I love, however, when I'm parked/stopped, there is a hissing noise in the back (I think it's coming from back right where the cover grille looking thing is). It's really high pitched, and sort of sounds like air escaping rapidly. Sometimes it's quiet and sometimes it's loud, but always noticeable. Sometimes I hear a noise coming from the front before it starts (not the same noise, sounds normal and coming from under hood), not sure if there's any correlation though. Has anyone else had this problem/know what it is?