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Q:

Where's the idle wheel located? on 2004 Mercury Mountaineer

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
About two months ago, I started hearing this winding noise while driving. whenever I turn the air condition on and get at a certain speed.
(1) Answer
I think that you mean the fan belt Idler Pulley (wheel) and/or tensioner. These do wear out on Fords:
here is a good source of repair information for your car
http://bit.ly/mitchell_repair_manuals_online

this should help you with the needed to replace those components.