WARNING: This page is about a different car, the 2006 Mercury Milan, 2006 Lincoln Zephyr, and 2006 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
The thermostat and thermostat housing are serviced as an assembly.
Fig 1: Thermostat Housing Replacement Components (2.3L) With Torque Specifications