http://www.peachparts.com/shopforum/showthread.php?p=197605
Unfortunately, I think mine is probably the "pods", as discussed by gsxr at the link above. I sure wish gsxr lived closer to me. I would definitely like to be his friend and get help with my W124. The slapping is probably a damaged diverter flap that may not really be causing the problem. I bet I am going to have to have the dash pulled and all of the pods replaced.
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I just couldn't give up on my 1995 E320.
I think it might be like always going back to that same bad relationship with an ex girlfriend.
You feel you love them too much, or you are just too stupid to know any better.
Flickr slideshow of my 1995 E320
http://www.flickr.com/photos/24145497@N06/sets/72157616572140057/