Things You’ll Need
Replacement water pump, Replacement coolant, Socket wrench and sockets, Torque wrench, Adjustable pliers, Hose clamp pliers, A new water pump gasket, Gasket scraper, RTV sealant, Acetone or Lacquer thinner
Disconnect the negative battery cable from the battery.
Drain the cooling system. Save the coolant if it is in good condition to reuse. If the engine coolant is old or is in poor condition, replace it with the appropriate coolant mixture. Coolant can be purchased in a premixed or concentrated liquid.
It will be necessary to remove the cooling fan and shroud if mechanically or hydraulically driven. On electric cooling fans you will not have to remove them if space is adequate for the pump to be removed.
Next squeeze the tabs on the hose clamps and move the clamps back several inches on the hose away from the housing. (If the clamps are the screw strap type, loosen the screw/bolt and slide back on the hose in the same manner.) Twist and remove the hoses from the housing. If a hose is stuck, use a pair of adjustable pliers near the end and twist the hose to break the seal. If any of the hoses are deteriorated, cut them off and replace. On 5.2L/5.9L V8 engines, unbolt the coolant return tube from the top of the engine and pull it out of the water pump.
Next remove all traces of the old gasket from the engine with a scraper and clean the bolt holes in the engine and the bolt treads to remove any corrosion and sealant. On six cylinder engines remove the heater hose fitting from the old pump and install it on the new pump using sealant on the treads. Clean the new water pump and the engine mating surfaces with acetone or lacquer thinner. Apply a thin coat of the RTV gasket sealant to the mating surface of the new pump then carefully mate the gasket and the pump. Next apply a thin layer of sealant to the engine side of the gasket and slip a couple of bolts through the pump mounting holds to hold the gasket in place.
Installation is basically the reverse. Attach the pump and gasket to the engine and finger tighten the bolts that were holding the gasket in place. Install the remaining bolts and any brackets taking care to reposition them. Torque the bolts to the recommended specifications. On the 5.2L and 5.9L engines, install a new O-ring on the on the coolant return tube and connect it to the water pump.
Auto repair can seem like an impossible task for the average car owner. However, replacing a car water pump is a relatively straight forward car repair that can be accomplished with minimal tools and experience.
Tips and Warnings
Special hose clamp pliers are available at most auto parts stores.
Always allow the engine to cool before removing the radiator cap, draining the coolant or replacing the water pump. Steam and hot engine coolant may be under pressure and their sudden release could result is serious burns.