In Reply to: spoke to soon posted by lonestarjeff on August 08, 2018 at 23:01:23:
I read you changed the pump, radiator, thermostat, & hoses. ...Not much left to change!
Any possibility the coolant temperature sensor has gone bad and needs replacement?
Highway speed overheating can also be caused by insufficient airflow thru the radiator or retarded ignition timing. ....The computer should be controlling the timing, but do you have anything mounted on the front which could disrupt or impede airflow?
Engine compartments being as crowded as they are, sometimes restrict airflow from LEAVING the compartment at high vehicle speeds. ....Have any air dams or spoilers been added or removed from the front end to change airflows?