Please Help. Whining Noise

[Aussie_Explorer]

Im getting a whining noise at idle that increases in pitch when i rev the engine. It sounds like its comming from around the altenator.
I have a 97 explorer (EB) V8. It also has the check engine code EGR Excessive flow, which has been on for a month or so now.

Mark

 

[Aussie_Explorer]

Sounds like the altenator

Ok i tried listening to it using the screwdriver trick. Its definanty loudest when I touch it to or near the altenator. New bearings?
If so how do i fix this and how hard is it to do?

Mark