[Paulporsche]

I got that clunk a while ago and lived w/ it for a few weeks. Then one day, I found a hex head bolt on the driver's side floor. Summoning up all my vast years of education and knowledge, I determined that the screw probably came from something behind the dashboard. Feeling up inside there, I turned on the wipers and noticed that the motor assembly moved w/ the action of the wipers, which produced the accompanying clunk. Between feeling around and checking the exploded view on this site, I found where the screw, which had worked its way out of the mounting bracket for the motor, should be. Replacing the screw stopped the movement, the clunk, and solved the mystery of the rogue hex head bolt.

With your X-ray Vision, you should be able to see the movement and missing or loose screw, unless you have the aftermarket Kryptonite dash.