Thanks for the idea Alias that could very well be it. The other day I had the car idling in neutral with the a/c on and it seemed like I could hear the noise a little more on the drivers side than the passenger side. From the times I have heard it, it's sounded more like it was in the mid block area, not really up on top, but then it's hard to tell over the abundance of other noises the Zetec makes.
You are right about the drive thru thing as well... that's where I noticed my noise was getting more obvious.
Are there any tests you can do to isolate throw out bearing noises?
