I recently bought a 2011 F-150 XLT North Carolina Edition with approximately 140,000 miles on it back in March. As I was driving home with it, I could hear a clicking noise in the engine bay. It makes the noise while idling and while the truck in motion but also completely disappears at random and shows up at random. I have no idea what it is and neither does the dealership. Also, whenever I turn the steering wheel more than a few degrees, there is a whining and squeaking (right word?) that can be heard even in the cab. Also, when turning the steering wheel, the entire truck will shudder from time to time. Again, no idea what it is. Any thoughts? Thanks.