Thanks for the info! There is one thing I have known about MB's is that when you hear a noise, something is wrong! I have just replaced my water pump and both pulleys, and belt, It was at 114k, so it was time. Of course the bearings in an accessory may be failing and causing the rattle, I have noticed that the AC compressor is noisy while in operation, so many things spinning around under there, who knows! I don't give up easily and I will figure it out sooner or later!
Happy Benzing!
Brian