Our 2008 had an annoying tap tap tap sound that would imtermittently come and go. It sounded like came from up against the windshield right next to the driver side pillar. We took it in and had the dash taken apart 3 or 4 times, then had the windshield replaced, still with no resolution. The dealer finally tracked it down to a loose piece of metal stripping somewhere around the firewall that wasn't completely glued down(sorry, but I didn't care too much to understand exactly where they found it). The service manager (Saturn of Olathe, KS) said he was going to file a report so that if anyone else had the issue there would be a record of the fix.