Lincoln Navigator: Engine Cooling - 3.5L EcoBoost (272kW/370PS) / Thermostat. Removal and Installation

Materials

Removal

NOTE: Removal steps in this procedure may contain installation details.

1. Drain the cooling system.
   Refer to: Engine Cooling System Draining, Vacuum Filling and Bleeding (303-03 Engine Cooling - 3.5L EcoBoost (272kW/370PS), General Procedures).
   

1. Remove the air cleaner outlet pipe.
   Refer to: Air Cleaner Outlet Pipe (303-12 Intake Air Distribution and Filtering - 3.5L EcoBoost (272kW/370PS), Removal and Installation).
   

1. NOTICE: Cover the accessory drive belts to prevent coolant contamination of the belts.

   Completely cover the accessory drive belts with waterproof plastic.

1. Disconnect PCV hose from CAC outlet tube.
   

1. NOTE: During installation, make sure the coolant outlet connection is fully seated on the thermostat housing before tightening the bolts.

   Remove the bolts and position the coolant outlet connector aside.
   Torque: 89 lb.in (10 Nm)

1. Remove the thermostat and discard the O-ring seal.
   

Installation

1. 1. NOTICE: Use Motorcraft® Orange Antifreeze/Coolant for vehicles built up to 08-July-2018 and Motorcraft® Yellow Antifreeze/Coolant for vehicles built from 09-July-2018. Failure to use the correct coolant can degrade corrosion protection.

      Install a new O-ring seal and lubricate it with clean engine coolant.
      Material: Motorcraft® Orange Concentrated Antifreeze/Coolant / VC-3-B (WSS-M97B44-D)
      Material: Motorcraft® Yellow Concentrated Antifreeze/Coolant / VC-13-G (WSS-M97B57-A1)
   2. To install, reverse the removal procedure.
      

1. Fill and bleed the cooling system.
   Refer to: Engine Cooling System Draining, Vacuum Filling and Bleeding (303-03 Engine Cooling - 3.5L EcoBoost (272kW/370PS), General Procedures).