i may be stressing over nothing here but would like to know if anyone else has noticed this noise...

its an 07, 5.9 with g56 trans

this noise is really noticeable when cold but does it all the time, it sounds like a tentioner or idler bearing failing, i changed the top idler just because but still have the noise, i checked all the other pullys and everything seems ok, then i noticed it can only be heard standing it front of the the truck, above or below the radiator i cant hear anything.... seems really strange, but for now i have just wrote it off as timing gear noise, or noise resonating from the clutch, anyone else notice anything similar?

 

Fan clutch. Sounds kinda of like a bell ringing, chain rattling, etc. Autozone at the time seemed to have the best price. They are a couple hundred if I recall.

This was on my '05 I had. But it is the same part number.