Thermostat: Service and Repair

Thermostat - 4.6L (3V)

Material:

Removal
1. Disconnect the battery ground cable.
2. Drain the engine cooling system.
3. Remove the air cleaner outlet pipe.
4. Remove the accessory drive belt.
5. Disconnect the crankcase vent tube from the intake manifold and position it aside.
6. Remove the 2 generator support bracket outer bolts.
7. Remove the 2 lower generator nuts and position aside the generator and wiring harness.

8. NOTE: RH thermostat cover bolt has a slotted flange.

Remove the LH thermostat cover bolt and loosen the RH bolt.
- Position aside the thermostat cover and hose assembly.
9. Remove the thermostat O-ring seal and the thermostat.
- Discard the thermostat O-ring seal.

Installation

1. NOTE: Lubricate the O-ring seal with clean engine coolant.

Install the thermostat with the smaller plate facing upward and a new O-ring seal.
2. Position the thermostat cover and install the 2 bolts.
- Tighten to 10 Nm (89 inch lbs.).
3. Position the generator and wiring harness and install the 2 nuts.
- Tighten to 25 Nm (18 ft. lbs.).
4. Install the 2 outer generator support bracket bolts.
- Tighten to 10 Nm (89 inch lbs.).
5. Connect the crankcase vent tube to the intake manifold.
6. Install the accessory drive belt.
7. Install the air cleaner outlet pipe.
8. Connect the battery ground cable.
9. Fill and bleed the cooling system.