Thermostat - 5.4L, 6.8L Gasoline Engines: Installation

WARNING: This page is about a different car, the 2003 Ford Pickup, 2003 Ford F550 Super Duty, 2003 Ford F450 Super Duty, 2003 Ford Excursion, and 2003 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: Thermostat must be installed as illustrated.

Use a new (A) O-ring seal to position the (B) coolant thermostat in the (C) upper intake manifold (9424).

Fig 1: Installing O-Ring Seal And Coolant Thermostat
Courtesy of FORD MOTOR CO.
Install the coolant outlet connection.
1. Position the (A) coolant outlet connection on the (B) upper intake manifold.
2. Install the bolts.
  
  Fig 2: Installing Coolant Outlet Connection
  Courtesy of FORD MOTOR CO.
Connect the upper radiator hose.
Fill the cooling system. Refer to Cooling System Draining, Filling and Bleeding .