Hey new to the forum and so far its been very informative liking what i see. Any how my girlfriends 3 (sedan) has a noise coming from what sounds like rear glass/back deck. It only doing it when its stupid cold out, I've only heard it once personally but she says it seems to be getting worse. Anyother time I wouldnt worry so much about interior rattle amd track it later but shes telling me it litterally sounds as if the back glass is cracking or being broken..... ive inspected it very closely and no niks no cracks no breaks... just wondering if anyone else is/has experienced this. Any input would great.