Hi I just bought a 1994 GT 5.0 and I recently drove it with the windows down and i noticed that there is a loud whistle type noise coming from what i can tell is the rear of the engine.Its not noticeable at idle but around 1000 rpm you start to hear it and it increases in volume as the rpm increases.Ive read other posts talking about alternators and such but i was just wondering if there might be something else for me to check.Its kinda hard to explain the sound its not a straight whistle saound per say it kind of reverberates and the frequency increases with rpm almost like a bearing is going out.This is the first mustang ive ever looked under the hood at so im a little lost plz help ! And of course thanks for the help.

 

https://www.youtube.com/watch?v=LY8a...e_gdata_player

Here is a video of it taken from my phone.

 

Video is set to private we can't see it.

 

OK fixed dry I've never put a video on YouTube before lol

 

The vid is quick but from what I can get sounds like a bad pulley, it still could be something else but try looking there 1st.

 

I thought pulley at first as well because the water pump pulley looks as to fly off at any moment, but the sound seems to be coming from the rear of the engine near the intake manifold.Brought it to Oreillys and the guy there said it sounded like an air leak either vacuum or gasket.