As discussed in the thread link, the sound you here is possibly the fan shroud rubbing the upper coolant hose. As stated by others, this is a known issue with the 2004 models, but not necessarily an issue with following model years. The 2005 model you're looking at may be starting to have this issue. Fix is pretty simple - just loosen the coolant hose and rotate/move it away from fan shroud. Make sure you look at the area in the attached picture to see if the coolant hose is showing a wear spot. Eventually, the hose ruptures and you could be anywhere when this happens. And this hose isn't just laying around at any of the local parts stores!