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If one has good hearing? you also could hear the alternator "whining" or "singing" under a charging load at varying RPM's. This is due to the three phase stator windings - magnetic field inducing this AC components into a loose laminated stator core parts. Could sound like something turning at...

Likely the Cadillac valve (on a HUMMWV?) used to control the fan clutch. It's the normally golden color, round thingie out in front of the windshield, under the hood, drivers side. When by-passing fluid thru internal design, makes a hyper sonic "hissing" further amplified by where / how it is...