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· Super Moderator
1966 Crown Coupe, 2016 200 S AWD, 1962 Lark Daytona V8.
17,647 Posts
There is a J: Sebring/Avenger section, but this is a General Tech section and your topic should be OK here.
It does sound like something belt-driven is making the noise by your description. If you remove the serp belt and briefly start and run the engine and the noise is gone, check each drive pulley and idler bearing by spinning it by hand and listening/feeling for a 'roughness' that would 'whirr' if it was spinning faster. A long screwdriver with the handle to the ear can be a good stethoscope.
It sounds like an accessory drive or idler bearing is failing. Alternators with the over-running clutch pulley are common noise sources, as mentioned.
I don't know your level of expertise or metric tool inventory, but you may want to get a service manual in your hands first before continuing on with the service.
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