Jager might be spot on. How many miles since you last changed the water pump? If over 60K, it might be suspect.
Do you notice any dried crud in the water pump area (lower passenger side of the engine) that suggest a small fluid leak from a worn bearing? If you put the belt back on and leave the access cover off, can you get a better handle directionally tell where the noise be coming from?
BTW: If you do run the engine with the belt on and cover off, make sure you don't have any loose clothing on that could get caught and remember to keep yourself clear.
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