My coolant temp sensor alarmed this morning and indicated I should pull over and idle the engine until it cooled. The fan came on and the engine cooled enough for me to make it home and shut it off. After checking the coolant level - right between min and max - I think the problem might be either the temperature sensor or thermostat. Are either of these parts easy to replace?Can someone please point out where I can find up-to-date info (pictures) where these parts are located?

Thanks in advance.

Dan