On the passenger side of the motor, there is a white vac line, located on top, you can't miss it, that probably came off. I have an 05 and I was having the same problem. It seemed to fix it so far. Another thing that seemed to help if that doesn't work, is turn the fan down, for a few seconds, and turn the temp to like 82-83 degrees. It usually comes back to the front and then turn it back cold and the fan back up. Hope this helps.