Thermostat Housing - 2.0L Duratec-ST (Zetec): Removal

Drain the cooling system. For additional information, refer to COOLING SYSTEM DRAINING, FILLING AND BLEEDING .
Remove the ignition coil cover.
1. Detach the retaining clips.
2. Detach the coolant pipe from the retaining clip.
  
  Fig 1: Detaching Coolant Pipe From Retaining Clip
  Courtesy of FORD MOTOR CO.
Using the special tool, disconnect the coolant hoses from the thermostat housing.

Fig 2: Disconnecting Coolant Hoses From Thermostat Housing
Courtesy of FORD MOTOR CO.
Disconnect the engine coolant temperature (ECT) sensor electrical connector.

Fig 3: Disconnecting Engine Coolant Temperature (ECT) Sensor Electrical Connector
Courtesy of FORD MOTOR CO.
Remove the thermostat housing retaining bolts.

Fig 4: Removing Thermostat Housing Retaining Bolts
Courtesy of FORD MOTOR CO.
Using the special tool, detach the coolant hose from the thermostat housing and remove the thermostat housing.

Fig 5: Detaching Coolant Hose From Thermostat Housing
Courtesy of FORD MOTOR CO.
Remove and discard the O-ring seal.

Fig 6: Removing And Discard O-Ring Seal
Courtesy of FORD MOTOR CO.