I recently replaced my fan clutch because it was making a lot of noise. It turns out that the old clutch was masking a chirpping sound coming from the fan area at idle rpms. I cannot identify where the sound is coming from, and it goes away at higher rpms. Any help on where to start looking would be appreciated.

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05 CRD Sport, Inferno Red (240K miles, Jan 2016)
Westin Brush Guard, Hella 500, Hidden Hitch
Magflow Muffler, ProVent CCV, Fumoto Valve, ORM
OEM Skids and Rails, EVIC, Mr Diesel Fuel Pump
Michelin XTerrains 235/70/16

Perhaps the one way clutch is bad on the alternator

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Atlantic Blue 06 CRD Limited (his)
Joined by a 2000 XJ Classic (hers)

could be a bad alternator clutch, take a look at your serpentine belt tensioner, if its moving any at idle then you know the pulley is bad.

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http://www.Colorado4Wheel.com
"Its not about what you can DO with your Jeep, its about where you can GO with your Jeep."
Knowledgeable - But Caustic

x3 for the alternator pulley being bad. Those are the only source of a chirping noise that I know of.

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Proud supporting vendor of LOST Jeeps
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Over 225 CRDs currently driving with my valves, timing belt, rockers, or ARP Studs.
Bad noises = REALLY bad things.

I read a lot of posts about the alt clutch pulley, and I'm convinced its likely my problem. Looks like the easiest fix is to replace the entire alt rather than trying to remove the pulley. Now on the hunt for a new alt - sounds like others have had good luck with Advanced Auto.

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05 CRD Sport, Inferno Red (240K miles, Jan 2016)
Westin Brush Guard, Hella 500, Hidden Hitch
Magflow Muffler, ProVent CCV, Fumoto Valve, ORM
OEM Skids and Rails, EVIC, Mr Diesel Fuel Pump
Michelin XTerrains 235/70/16