Quote:

Not THAT part! This Part:
"or the waterpump (high volume?) is pumping water too fast that it doesn't cool properly at highway speeds



Some people still believe that you can "pump water so fast through the radiator it doesn't have time to cool". That is just flat wrong.

However - it IS possible to spin the water pump too fast, (such as using a non-a/c pump with an a/c pulley) which can result in cavitation at highway speeds. So it's actually pumping less water than normal despite the higher RPM, which could result in a cooling problem...