Where is the thermostat located on a 2004 Xterra?

On a 2004 Nissan Xterra, the thermostat is located on the engine, typically at the end of the upper radiator hose where it connects to the engine block. To access it, you may need to remove the upper radiator hose and the thermostat housing, which is usually secured by bolts. Make sure to allow the engine to cool before attempting any work on the cooling system.