Thermostat - 3.9L: Removal

WARNING: This page is about a different car, the 2005 Lincoln LS. However, it is still accessible from the selected car via links, so may be relevant.

Drain the cooling system. For additional information, refer to COOLING SYSTEM DRAINING, FILLING AND BLEEDING .
Remove the thermostat housing. For additional information, refer to THERMOSTAT HOUSING - 3.9L .

NOTE: Thermostat can be rotated in either direction to release it from the thermostat housing.

Fig 1: Removing Thermostat From Thermostat Housing

Courtesy of FORD MOTOR CO.

Using a 18 mm (0.7 in) open end wrench, simultaneously push down and turn the thermostat retainer to release it from the housing.
Remove the thermostat spring, thermostat main spring and the thermostat element.