Where is the thermostat located on a 1998 Infiniti I30 3.0liter and how to replace it?

The thermostat on a 1998 Infiniti I30 3.0-liter is located in the engine compartment, near the engine block, typically at the end of the upper radiator hose where it connects to the engine. To replace it, first, ensure the engine is cool, then drain the coolant, remove the upper radiator hose, and unbolt the thermostat housing. Replace the old thermostat with a new one, ensuring the gasket is properly positioned, reassemble the housing, reconnect the hose, and refill the coolant.