Standing in the front of the engine, It will be on the bottom right corner of the radiator.
Towards the engine.
You have the drain the lower radiator hose, 6.0 liter do not have a drain valve.
A 2004 Chevy Avalanche does not have a radiator drain. The front of the vehicle needs to be raised, then the bottom radiator hose disconnected to drain into a pan.
Follow the lower radiator hose to the engine, you will see where it clamps to a housing. Drain the coolant, then remove the 2 bolts on the housing take it off, clean gasket and replace THERMOSTAT. Put it back together.
GM does not have a 5.4 liter it's most likely the 5.3 liter.
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Where is the thermostat located at on a 2004 Chevy Malibu 3.5 liter V6
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The radiator drain plug on a 2004 Chevy Venture is located at the bottom, left side of the radiator. It allows for the coolant to be quickly drained during maintenance.
If it has an automatic transmition there is no drain plug, you remove the pan to drain it.
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should be similar ...... http://www.justanswer.com/car/3trf2-radiator-drain-plug-2003-chevy-impala.html
Seeing as your not that savvy.. take it to a 'lube shop let them change your oil