Thanks everyone for posting about your experiences in this thread. On the one hand I'm glad to find that this is a known problem; on the other, now I'm really not looking forward to going back to the Ford dealer. Last time I took it there during the winter for the rumbling noise, they said it was normal and gave the car back to me. Now that the temperatures are above 50F, the scraping noise has started. I just bought this car used (still under warranty). It's my first Ford (was loyal to Toyotas and Hondas previously) and am super disappointed about this major issue. I'm kind of embarrassed to take people in my car now "what's that noise??"... And many friends have been asking me about how I like the Ford and I feel like I should rescind my initial answer :(
If anyone is still reading this thread, any advice for how to get this fixed with the least resistance from Ford's side?