You must replace the unit. Mine failed too. The circular plastic "surround" that was molded along the top of the fan blades and one fan blade cracked, broke and came apart. This made the fan vibrate like a washing machine on the spin cycle that's off balance. Very nasty. It eventually cracked all the way through the plastic surround.
I'm guessing that I picked up a rock somehow and it bounced around and broke the fan blade. Either that or the plastic just failed due to stresss. These things can spin pretty fast.
Dan
The Gen III is a hydraulically driven fan, runs off power steering. My first choice would have been to stick in an electric like the one on E-bay. I figured by the time I rerouted and plugged the fluid lines I was better off just replacing what I had.Today is your lucky day: http://cgi.ebay.com/ebaymotors/Vipe...ryZ46098QQssPageNameZWDVWQQrdZ1QQcmdZViewItem Maybe this will fit a GenIII?
The 2008 has twin electric fans that should fit our cars, if you ever have another problem. I will likely switch to them if I have another failure.
The hydraulic fan moves a ton of air compared to the single electrics. No sure how the new 2008 unit compares.
Dan