I guess it could be called a whistle now that I think about it. I will check and get back to you.

 

Pour some water while the engine is running on your belts. If the squeal stops, it means your belt needs replacing. Sometimes a lot of foreign objects get stuck in the grooves of the belt. Remove and clean with a tooth brush.

 

Found it, it was the idle control valve thing. Thanks for the help.

 

hey man share the location of this thing. Mine does the same thing . 98 Disco (99,120miles)

 

I can't figure out how to post pictures but if you look at your air intake hose where it attaches to the throttle body, you will see a smaller hose coming off the air intake hoseand going to your idle air control valve.

Test that area and you will likely find that the fitting to the idle air control valve hose at the air intake hose is cracked.

The idle air control valve is a little smaller than a soda can on top of the engine toward the firewall and in the center (centered left to right and close to the fire wall).

Hope that helps.