Steel Soldiers now has a few new forums, read more about it at: New Munitions Forums!
Microsoft MSN, Live, Hotmail, Outlook email users may not be receiving emails. We are working to resolve this issue. Please add support@steelsoldiers.com to your trusted contacts.
Upper hose where it meets the engine. That 2 bolt flanged housing is the thermostat housing. Use care when extracting the 2 - 15 mm hex bolts. Sometimes the aluminum threads come out with the bolts. Good Luck and Please report back.
https://www.steelsoldiers.com/threads/6-2-diesel-correct-operating-temp.106003/ You are at the maximum range. I would look into getting the radiator and thermostat cleaned and changed out. Good Luck.