For what its worth...
I needed more cooling for slow off road use, as well as occasional light duty towing, and to avoid heat ups during the dreaded stop-and-crawl traffic so common in my area of Colorado...
Once I had a tranny overheat, which really bummed me out. Isn't this thing supposed to be a jeep? Come on! I was in 4x4 LO 1st gear on a slope that was about 30 deg. not unheard of. something had to be done. I couldn't go on living like that, overheating the transmission while trying to show off, its really embarrassing!
I purchased part number 82210991 from morris4x4 center.
It was a listed part from the dealer as working with my 2008 jeep liberty sport.
I verified that it was the correct part using factorychryslerparts.com search tool. 82210991 is a verified fit for a KK liberty 2008. However, the aforementioned site would not sell to me because they said it wouldn't fit, despite their own site telling me that it would! Therefore I purchased from morris4x4center
this part is often listed as working with 4.3L V6 engines and for the jeep grand Cherokee etc... not the 3.7L liberty.
It arrived early, with a fan blade and black steel carrier (55038108AA) , 2 sets of bolts (06034860) , and 2 fan clutches too boot!
I chose to use the lighter duty fan clutch (55038106AA) for clearance reasons as well as fuel economy reasons.
this one has a flat face, and fits easier, and is a sign of lighter duty service. this means that the viscous clutch will disengage more at cool temps, and engage less at high temps. The heavier duty viscous clutch is identified by the vast increase of fins. This clutch engages more at high temps, and also more at low temps, therefore robbing some engine power. I did not verify that the larger clutch actually fit my vehicle. Besides I already knew that the vehicle was spec'd to use 55038106AA clutch. There is about 3/4" of clearance between the viscous clutch and the electrical fan. (you can slip your hand in between them)
The fan and clutch assembly fits perfectly, and works well. All that, after many people told me it was dead wrong!
It cost $150 free shipping. Done.
temperature sits at about 190F which is what the thermostat is set to. no matter what.
It worked with my existing electrical fan and shroud. I did elect to drain 1/2 coolant from rad. so that the upper hose could come off and allow easier installation of fan shroud around fan assembly. this also required me to remove the battery, and horn as well as washer fluid tank/coolant tank and fan shroud and fan connector.
fan was screwed on to wtr pump with 36mm adjustable wrench, and a hex key jammed in the pump pulley hole. no special tool needed.
the air drag on the fan blade will also serve to tighten the fan on to the pump shaft.
a drop of blue lock tight was on each of the fan bolts as well as the main shaft threads for security.
refilled fluid, and purged air. vehicle works well.
got to love that roar at start up. after driving for a few minutes with higher RPM, the fan clutch pumps the fluid and releases and spins down.
at idle, the fan increases in speed, and barely gets loud at all. the whole engine compartment is much cooler now, and my alternator also enjoys a cooler life too.
not to mention the power steering pump. Man what a difference it makes for the A/C performance in stop-and-crawl traffic.
only issues was that the thermostat in cool weather (65F) closes almost completely because the radiator is so effective now. this caused a slight increase in lower hose pressure causing a drip. replacing a defective hose clamp and tightening well cured that problem. just be careful getting a clamp tight on the stupid plastic hose barb for the engine thermostat housing.
hope this helps someone out.
again, it fits and works on mine,
please research it for yours.