Thermostat - 5.4L, 6.8L: Installation

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.

Fig 1: Positioning Coolant Thermostat In Upper Intake Manifold
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: Positioning Coolant Outlet Connection On Upper Intake Manifold
  Courtesy of FORD MOTOR CO.
Connect the upper radiator hose.
Fill the cooling system. Refer to COOLING SYSTEM DRAINING, FILLING AND BLEEDING .