How do I change the Thermostat?

It's not a complicated job, with the coolant hot drain the coolant from the radiator by opening the drain plug at the bottom of the radiator, remove the hose at the thermostat housing, remove the thermostat housing, remove the thermostat and replace thermostat and thermostat housing gasket. It will take you 45 minutes. There is a company that independent auto repair shops "buy" their information from that offer a very reasonable service to do it yourselvers. You can get a one week subscription or year subscription very cheap. The information is year make and model specific repair procedures, service bulletins, component locations, wiring diagrams ect.... great quality information same as the professionals have ,much better than generic workshop manuals from parts stores, much cheaper than the factory manual try http://bit.ly/mitchell_repair_manuals_online and get an online repair manual subscription.