I am experiencing a drainage problem on my 2006 Cobalt LT. The AC drain seems to be partially/intermittently clogged. I have attempted to clear the tube coming through the firewall, and it seems to have made the problem worse. It started as just a few drops of water on the passenger front floor. Up under the dashboard, behind the center console area. Now, I have found, on 2 occasions, almost 2 inches of water on the floor. As I said, I took the dashboard out, and only found that the entire HVAC system is held together with plastic rivets. Please advise before I need a scuba suit to drive.