Hey Randy==It is a bit of a job to change it and you have to raise the engine slightly. Get a manual on it from a parts store and it should have pictures and everything. GodluckJoe
Randy....I assume it is a 4.6 northstar and these are pretty easy with correct tool. The pump is on the rear(driver side) of engine toward the front. The airbox and intake tube are removed and you can now see clearly the thermostat /waterpump housing. Remove hoses and remove bolts from drive belt tensioner. Remove cover of housing.....I would replace thermostat at this time as well as chk. drive belt to replace if needed. With the cover off you can now see the impeller clearly. This is what is to be replaced and it requires a tool to turn it out of wedge flange as well as return new one to position with new O-ring in place. Your auto parts store may have one to loan or purchase. IT IS NEEDED to do this R&R correctly. Good luck*
I just changed mine on my 94 Deville and it was not too bad. It has the 4.9 liter. First, get a replacement pump. Please note the importance of not removing the two bolts holding the timing cover to the water pump inlet cover. They are to the right and below the pump. After draining the radiator, remove the strut-to-core support brace, the battery, and finally the coolant recovery tank. (note: horn has to be removed for the recovery tank to clear the A/C receiver/dryer) Then carefully feel around the pump and count all the fasteners. I actually layed the new pump in front of me while I worked. While the belt is still on the motor, loosen the 4 drive pulley bolts on the pump slightly but don't remove them yet. Now you can take note of the serpantine belt path and remove it from the car via a 1/2" drive ratchet on the tensioner. Next, remove the drive pulley you loosened earlier. Now remove all the bolts and nuts holding the pump on the timing cover. I believe I used a 1/4 drive 10mm, 15mm socket, and a T45 or T50 Torx wrench. After all are removed, carefully removed the pump via a putty scraper and a little force taking note not to damage the timing cover, as this will result in a leak. After removal, carefully clean the cover of any and all stuck gasket and wipe dry with a cloth. To prepare the new pump for installation, adhere the included gasket to the pump with liquid shellac gasket compound. This holds the gasket in place while you install the pump in the tight space. After coating the other side of the gasket and lining the pump up with the engine, start two bolts to hold it in place. Go ahead and force it in place and start and finger tighten all the remaining bolts and nots. Then torque in this sequence: Torx and 15mm headed bolts - 30ft lbs. The 7, 10 mm hex nuts - 5 ft lbs. The 7, hex head bolts - 5ft lbs. Next, install the pump pulley as tight as you can and then install the belt and final tighten the pullet bolts. All remaining steps are just the reverse order.
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