Whining noise

My uncle is a mechanic and he told me it might be ur fan clutch. He has worked on multiple Infiniti's with fan clutch failing. Different models though, not FX's
 
I have the same problem. I replaced the 2 pulley and the belts and still the same noise wen I turn off the car. Sound like a vacuum leak but I cant figure out was causing this.
 
My problem was my hose that connects to the intake was cracked. Replaced it noise went away. Check that was cleaning my throttle body and saw it
 
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