Where is the thermostat located on a 1998 Dodge Neon?

Follow the top radiator hose from the radiator back. Go bast the break in the hose (where the radiator cap is for whatever reason ) past that right where it mounts to the top of the engine. That cast pot metal housing that the top radiator hose connects to is the thermostat housing . The thermostat is inside of that. If your engine is cold and the pressure is released from the cooling system this is an easy item to fix and you wont lose much anti-freeze when you tear it apart.