I have a 2011 Malibu and get a creaking noise on the drivers side where the upper seat belt mounts on the B pillar (area) when going over some bumps. It is most predominant between 6 and 15c (~40-60F). Have driven 6800 miles and not a sound when above this temp. range. No sunroof in my case, does not appear to be the roof/pillar airbag or window glass (open closed the same). I am suspecting door frame rubbing against the chassis or seatbelt mechanics. Any one else have similar?