1998 Lincoln Continental how to change thermostate

From the driver's side at the bottom of the radiator the hose runs across to the passenger side of the car. It turns up into a housing with a secondary smaller hose coming out the side of the housing. If you remove the 2 bolts holding this housing together you will find the thermostat inside with an O ring seal that has to be replaced in the right position when you reinstall the new thermostat.