Pontiac 12462265 Engine Coolant Pump Kit

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To remove the water pump, start by disconnecting the battery cable from the negative battery terminal. Then, drain the coolant and remove the upper radiator shroud and fan/clutch assembly. Next, take off the serpentine belt and water pump pulley. Disconnect the radiator hose and heater hose from the water pump. Unbolt the water pump, tapping it with a soft-lace hammer if necessary to break the gasket seal. Inspect the pump's impeller blades for corrosion and replace the pump if needed. To install the new water pump, clean the sealing surfaces of all gasket material on both the pump and block. Apply a thin layer of RTV sealant to both sides of the new gasket and install it on the water pump. Place the water pump in position and tighten the bolts to the specified torque. The rest of the installation procedure is the reverse of the removal. Finally, add coolant to the specified level, start the engine, and check for leaks in the water pump and hoses. Bleed the cooling system of any air.

There are three quick-checks to determine if the water pump is functioning properly while it is still installed on the engine.

To remove the water pump, you need to unbolt it, tapping it with a soft-lace hammer if necessary to break the gasket seal.

One way to check is to inspect the weep hole in the water pump snout for coolant leakage, indicating a failed seal.

Disconnect the lower radiator hose, heater hose, and bypass hose at the water pump.

A failure in the water pump can cause serious engine damage due to overheating as the pump will not be able to circulate cooled water through the engine.