03 Lincoln Aviator thermostat.

Located on the lower radiator hose at the block next to oil filter. Removing hose from lower therm housing makes more room for one of the two 8mm fasterns… (youlle need every mm you can get.) Therm just falls out with lower housing. Replace o-ring and dbl check orientation. I replaced the spring clamp with a new one to safeguard leaks in this tight space.