GM 19417097 Water Pump Kit

For 4.5L and 4.9L engines,Disconnect the negative battery cable and drain coolant. Remove the air filter assembly, coolant recovery tank, cross brace, water pump pulley, and the pump. Clean gasket surfaces and fit a new gasket on the pump. Install the pump, following by the pulley. Reinstall other components in reverse order. Refill with coolant and check for leaks.For 4.6L engines: Disconnect battery and drain coolant. Remove air cleaner assembly, water pump drive belt, hoses from thermostat housing, and water pump bypass hose. Remove water pump cover, then the pump using a special tool. Clean surfaces, install new O-rings, and the new pump. Replace the cover with a new O-ring and reinstall components in reverse order. Refill with coolant.

Water pump failure can cause engine overheating. To check the water pump:Warm the engine, squeeze the upper radiator hose. A pressure surge when releasing indicates proper function.Check the weep hole for leaks, signaling seal and bearing issues. If it's leaking, replace the pump immediately.Listen for squealing sounds from the pump, suggesting bearing failure. If there's noise, replace the pump. Lastly, check for pulley movement; any shift means worn bearings and the need for replacement.

Disconnect the cable from the negative battery terminal. Drain the cooling system. On models with multiple V-belts, mark the accessory drive belts with white paint to simplify installation. On models with an engine-driven fan, remove the upper fan shroud. On models with multiple V-belts, remove the accessory drive belts by loosening the pivot and adjusting bolts and pushing the accessory toward the engine. On models with a single serpentine belt, rotate the belt tensioner pulley away from the belt to release the tension on the belt, remove the belt, and release the tensioner. On some engines, it may be necessary to remove one or more accessories to gain access to the water pump. Remove the bolts retaining the fan to the fan pulley hub, then separate the fan and pulley hub from the water pump. Disconnect the heater and lower radiator hoses from the water pump. Remove the water pump mounting bolts and separate the water pump from the engine. Prior to installing the water pump, remove all old gasket material and sealant from the gasket sealing surfaces. Clean the threaded holes in the block as well. Installation is the reverse of the removal procedure. If a new water pump is being installed, transfer the heater hose fitting from the old pump to the new one. On L4 engines, use a new gasket or RTV type sealant when installing the pump. On V6 and VB engines, use a new gasket when installing the pump. Tighten the bolts to the specified torque after coating the threads with RTV sealant to prevent leaks. Adjust all drive belts. Connect the negative battery cable and fill the radiator with a mixture of antifreeze and water. Start the engine and allow it to idle until the upper radiator hose gets hot. Check for leaks. With the engine hot, fill the radiator with more coolant mixture until the level is at the bottom of the filler neck. Install the radiator cap and check the coolant level periodically during the first few miles of driving.

A faulty water pump can cause engine overheating and damage due to lack of coolant circulation. Three checks can be performed on the pump. First, squeeze the upper radiator hose when the engine is warm; a working pump will cause a pressure surge. Second, inspect the pump's "weep" holes for coolant leakage, indicating a seal failure. This may require a flashlight from underneath the vehicle. Lastly, a squealing sound or movement in the water pump pulley may indicate shaft bearing failure. Don't confuse this with drive belt slippage, which also causes squealing. Replace a defective pump immediately.

There are three ways to check it.

Start by disconnecting the cable from the negative terminal of the battery.

Clean the sealing surfaces on both the engine block and the water pump.

The first step is to disconnect the battery cable from the negative battery terminal.

Excessive bearing wear can be identified by attempting to move the water pump pulley horizontally or vertically. If there is movement, the bearing is nearing the end of its service life and replacement is required.

The first step is to disconnect the battery cable from the negative battery terminal.

The first step is to disconnect the battery cable from the negative battery terminal.