Where is the water pump on a 2004 Chevy Silverado LS 5.3 Liter Engine?

front of the engine, just left of center. it has a big black pulley wheel (about 5" in diameter) on it. follow your lower radiator hose from the radiator toward the engine, it goes into the thermostat housing, which is bolted onto the water pump. or you can follow the hoses that come off the coolant reservoir down to the passenger side front of the engine. they go to the water pump as well.