Car should not run 25+ degrees over thermostat rating. Common problem to keep climbing at highway speeds. I seem to have conquered this issue with a 4 core brass copper radiator, 7 blade clutch fan and the Hayden heavy duty clutch, factory fan shroud and a smaller diameter water pump pulley. This is driving in 90+ degrees AZ heat does not go over 185 on the highway, mind you I have 3.73 rear and I'm cruising at 3000+ rpm at 65 mph. Electric pumps don't move the volume of water needed at highway speeds.
