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Passenger side rear of engine. Cylinders are front to rear passenger side 1-2-3-4. Driver's side front to rear 5-6-7-8.
Depending on weather it has a cable or hyd. clutch it could be your slave cyld. is stuck or is low on oil. It is cable the linkage might be stuck or your cable is broken or out of adjustment.
Well I have a 2002 Cherokee and I was quoted anywhere from 400-800 dollars, they said more if its and 8 cyld or the positioning of the engine which makes it longer to remove and more labor.
If this is a gasoline engine I found this site very helpful. Too bad I found it after the procedure was done.. Its very confusing without instruction. http://www.mercedesshop.com/Wikka/DoItYourSelf Just look up the Water Pump and It shows every step. Which water pump? On my 1986 190D 5 cyld diesel there is two; the one on the engine and another that is electrical that circulates water through the heating slystem, I have an automatic temperature control on the dash. The electric one comes complete and is made by Bosch. It has 15mm inlet and outlet, hose connected with hase clamps. There are two bolts that hold it to the fender well on the passenger side under the hood near the front of the engine. It takes a 10mm socket. I have not changede the engine water pump but it would be in order to first drain the water, thenremove the fan/clutch assembly, then loosen the belt, remove the pulley, then the bolts that hold the pump to the pump body, clean the old gasket material and install the new pump.