My mechanic is going crazy trying to figure out what is causing an intermittent clatter. It is not wheel of brake related. It is a very regular and rapid mechanical clicking, unrelated to speed and seemingly coming from the front middle. The kind of noise you might get if a fan blade was hitting something but that would not seem to be the problem. Used to most often happen when car was cold (and fan would not even be going). Now happens much more often. (First started many years ago). It doesn't seem like much is up front. Could it be abs related (No brake or brake pedal vibration). Anyone seen this?