Thermostat, Water

3.8L Engine

Removal

1. Partially drain the engine cooling system so that the coolant level is below the water thermostat (8575) .

2. Disconnect upper radiator hose (8260) at the water outlet connection (8592) .

3. Remove two water outlet connection retaining bolts and remove water outlet connection and water outlet connection gasket (8255) .

Installation

1. Clean gasket surface on water outlet connection and on intake manifold (9424) .

   NOTE: To prevent incorrect installation of the water thermostat , the water outlet connection on all engines contains a locking recess into which the water thermostat is turned and locked. Install the water thermostat with the bridge section in the water outlet connection . Turn the water thermostat clockwise to lock it in position on the flats cast into the water outlet connection .

2. Position water thermostat , water outlet connection gasket and water outlet connection on the intake manifold . Install the two retaining bolts and tighten to 20-30 Nm (15-22 lb-ft).

3. Connect upper radiator hose to water outlet connection . Move new hose clamp to water outlet connection . Make sure clamp is between alignment marks on hose.

4. Fill cooling system with the recommended Premium Cooling System Fluid E2FZ-19549-AA or B (in Canada, Motorcraft CXC-8-B) or equivalent meeting Ford specifications ESE-M97B44-A and ESE-M97B43-A.

5. Start engine and check all hoses and connections for leaks.

5.0L Engine

Removal

1. Partially drain the engine cooling system so that the coolant level is below the water thermostat .

2. Disconnect the water bypass hose (8597) at the water outlet connection .

3. Note location of distributor (12127) and loosen hold-down clamp (12270) , rotate the distributor to gain access if necessary.

4. Disconnect the upper radiator hose at the water outlet connection .

5. Remove the two water outlet connection retaining bolts.

6. Remove the water outlet connection and water outlet connection gasket .

Installation

NOTE: To prevent incorrect installation of the water thermostat , the water outlet connection on all engines contains a locking recess into which the water thermostat is turned and locked. Install the water thermostat with the bridge section in the water outlet connection . Turn the water thermostat clockwise to lock it in position on the flats cast into the water outlet connection .

1. Clean the gasket surface on the water outlet connection and on the intake manifold .

   NOTE: The water thermostat should be rotated slightly when installed in water outlet connection to lock water thermostat in place on flats cast into water outlet connection .

2. Position the water thermostat , water outlet connection gasket and water outlet connection to the intake manifold . Install two retaining bolts and tighten to 16-24 Nm (12-17 lb-ft).

3. Reposition the distributor for correct ignition timing if necessary. Tighten hold-down clamp bolt to 24-35 Nm (18-25 lb-ft).

4. Connect the water bypass hose at the water outlet connection .

5. Connect the upper radiator hose to the water outlet connection and secure with clamp.

6. Fill the cooling system with the recommended 50/50 mixture of Premium Cooling System Fluid E2FZ-19549-AA or B (in Canada, Motorcraft CXC-8-B) or equivalent meeting Ford specification ESE-M97B44-A and ESE-M97B43-A and water.

7. Start the engine and check all hoses and connections for leaks.

   To prevent incorrect installation of the water thermostat , the water outlet connection on all engines contains a locking recess into which the water thermostat is turned and locked. Install the water thermostat with the bridge section in the water outlet connection . Turn the water thermostat clockwise to lock it in position on the flats cast into the water outlet connection .