if this noise shows up at 2300 RPM, you dont need to drive the car, just push the throttle by hand until it makes the noise at 2300rpm, then try & listen for where the noise is coming from to narrow it down. if you have a helper they can push the throttle while you listen around for the noise & even use a stethascope or long screw driver to put the end on each item like alt, p/s, water pump & hold the end to your ear, carefully.
as mentioned you can remove 1 belt at a time to see if the noise stops at 2300 rpm, or a short drive if the car needs to be moving for some reason to make the noise, but if its rpm specific you dont need to drive the car.
also just an FYI, you didnt need to buy a new fan/clutch, (if thats what you did) could have just removed the fan & bolted the pulley down tight, then hit the 2300rpm & see if the noise is gone or changes.
hops you can track it down!
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