Thermostat: Service and Repair

Thermostat - 6.0L Diesel

Removal and Installation

All vehicles
1. Drain the engine cooling system.
2. Remove the air cleaner assembly.

Early build





3. NOTE: Engine side shown, charge air cooler side similar.

Remove the charge air cooler duct.

Late build





4. Loosen the clamps and remove the charge air cooler duct.

All vehicles





5. Disconnect and position the upper radiator hose aside.





6. Disconnect the exhaust backpressure sensor electrical connector and retaining clip.





7. Disconnect the exhaust backpressure tube at the exhaust manifold.





8. Remove the retaining nuts and exhaust backpressure assembly.





9. Remove the stud bolts and thermostat assembly.
^ Remove and discard the O-ring.
10. To install, reverse the removal procedure.
^ Install a new O-ring on the thermostat assembly.