Hot at highway speeds

roccodart440 said

What would cause a temp increase at highway speeds when traveling at more RPm?

Click to expand...

Simple... the engine is producing more power so the heat output goes up. There is no more power needed to push the car body through the air or to roll the wheels and tires at the same highway speed, BUT there is more power in torque converter and trannie losses, and the engine itself requires more power; as a self-powered air pump, turning more engine RPM's raises pumping and frictional losses, and thus it needs more power.

So your cooling system will have to push more heat out, and all parts of the cooling system have to get hotter to do that if nothing is changed: coolant, radiator, etc. The suggestions to lower the temps by sealing off the rad to the core, etc., make the radiator more efficient by 'connecting' it better to the air with more airflow. You could do the same with a larger radiator or one with more rows.

Or, just fix the OD....like you plan!