If you lightly touch a long screw driver to the pulleys and put your ear to the end you should be able to tell which one is making the noise. BE VERY CAREFUL! Do not get the screwdriver in the belt. Odds are which ever one is squealing will need to be changed.
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2008 Jeep Liberty KK, SkySlider, Tow Package, OME/Bilstein Lift, Flowmaster Delta 50, Removed Resonator, DuraTracs, In-dash CB, PIAA 520 ATPs, Dual KJ Tow Hooks
http://www.cardomain.com/ride/3974106/2008-jeep-libertyLost Jeeps PNW/BC Members Map