Where is thermostat on 04 Saturn Ion and how to change it?

The thermostat on a 2004 Saturn Ion is located near the engine, typically at the end of the upper radiator hose where it connects to the engine block. To change it, first, drain the coolant, then remove the upper radiator hose and detach the thermostat housing. Replace the old thermostat with a new one, ensuring the gasket is in place, and reassemble the components before refilling the coolant. Always check for leaks after completing the installation.