OK -- usaly if the clutch goes bad its a sign of the front seal on the a/c compressor is leaking ,, oil gets on the clutch and it starts to fall apart ----but there are some cases ware the clutch just goes bad ,,and its the only thing you need to replace ,,,,,you may be in this category ,, if the clutch and pulley to not look like the have oil or a wetness to it ,,,then you can just replace the clutch ---they are about $50 ,,

as you can see from the pic above there is one 8mm bolt that holds the clutch to the a/c compressor( number 6 ) ,,, on the 05 Taurus you can just remove this bolt and slide the clutch off and replace it without remove the compressor from the engine ---it takes some time with hand tools ,,,but its better then removing the whole unit ------- once the bolt is removed and you slide it off there is a spacer,,usaly only one between the clutch and the compressor ( number 4),,it looks like a small washer ,,,sometimes it sticks to the compressor and some times it sticks in side the clutch ,,,,make sure you put it in the new clutch --

but if you clutch looks like its leaking on the front seal ,,then you have to replace the compressor

Chris