Quote Originally Posted by butter View Post
could it be coming from a power steering belt? try WD-40 that belt a bit. i had the same problem, which came from the power steering
btw it was on a F22b1
The engine doesn't have power steering or air conditioning, the crank pulley is only driving one item which is the alternator. the high pitched noise only appear at constant idle at around ~750, it will disappear if RPM is increased or decreased even by 100 RPM.