Removal and Installation

WARNING: This page is about a different car, the 2010 Mercury Milan, 2010 Lincoln MKZ, and 2010 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.

With the vehicle in NEUTRAL, position it on a hoist. For additional information, refer to JACKING & LIFTING .
Drain the cooling system. For additional information, refer to Draining .
Disconnect the Knock Sensor (KS) electrical connector and detach the wiring harness pin-type retainer.
Disconnect the heater hose at the thermostat housing.
NOTE: Disconnecting the heater hose first will aid in the removal of the bottom thermostat housing bolt.
Remove the 3 bolts and reposition the thermostat housing to gain access to the lower radiator hose clamp.
- Remove and discard the gasket.
- To install, tighten to 10 Nm (89 lb-in).
  
  Fig 1: Locating Thermostat Housing & Bolts
  Courtesy of FORD MOTOR CO.
NOTE: The view of the thermostat housing bolts is obstructed by A/C and engine components. However, the bolts can be removed using 1/4-in drive hand tools.
Disconnect the lower radiator hose at the thermostat housing.
To install, reverse the removal procedure.
- Install a new gasket.
Fill and bleed the cooling system. For additional information, refer to COOLING SYSTEM DRAINING, FILLING AND BLEEDING .