Originally Posted by 78elcaminoman
and this would cause the Clicking sound coming from the firewall area?
Well, listening to a video is not at all like being there. I did not hear a distinct click when I played the video, more like the cyclic rubbing, or squeaking sound from a pulley. Although I did not hear the clicking you are referring to, a bad tensioner pulley spring can make a clicking noise, and the tensioner is located closer to the firewall than the radiator.
Perhaps the clicking was just too quiet or at a frequency that I cannot hear. It is possible for a leaking exhaust manifold to make a clicking sound - doesn't seem likely, but it'* true, they can sound almost as loud as a ticking lifter, and that could be located against the firewall.
I should have pointed out that the serpentine belt may not have to be removed completely to run the no-belt test suggested above. That would necessitate pulling the spacer under the front mount. It may be possible to de-tension the belt, and remove it from the alternator pulley. That may give you enough play in the belt to arrange it so that it does not touch the crank pulley, which will be the only pulley moving when you perform the test.