Date registered: Feb 2007
Vehicle: 04 odyssey (265k) 1995 E320 wagon (295k)
Mentioned: 4 Post(s)
Quoted: 324 Post(s)
I would try stethoscope/pipe/screwdriver to each accessory and your ear (transmit sound, but don't injure yourself with moving engine) like Jayare suggests. Try to pinpoint the noise.
Or remove the serpentine belt and see if the noise persists. No running accessories...no noise means its an accessory. From there try to spin each one by hand and see if one is crunchy/noisy
If you have a 95, you might luck out and have the later tensioner so it will be easy.
If its the old style make sure you research how to loosen so you don't break the adjuster. And be prepared for the tensioner to die if its really old (rubber no longer provides tension)
It could simply be a bad accessory.
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W124, One of the last great gifts of West Germany