Follow the top radiator hose to the engine. That is where the t-stat is. Remove the air cleaner and top radiator hose. Remove 2 ten mm nuts and pry pressure sensor bracket off of studs. It is tight but will move. Remove 2 more ten mm nuts and the t-stat and t-stat housing lifts off of the studs. Use a new O ring when re-installing. about 5 bucks at dealer. This is for a 6.0 but I think they would be the same.