Hi,The pump is one component of a cooling system. The vehicle is a significant factor as well.
Not enough info to even guess at an answer.
Nice!Remember - you have zero regen with a full battery. So, on a hill, you need brakes.
If nobody's been there, done that:
Assume a 90% efficiency motor.
Now you need to figure out how many kW average continuous you will run at to climb the hill at your rated speed. Take 10% of that number to figure out how many kW you need to dump via the radiator. I'm going t guess at 30mph it's going to be about 750W.
I bought a power steering small radiator with a 12v pump. I will fit them if needed on the 10kw. I'll check the temp with/without.Coolant temperature at outlet of controller and pack. Radiator is optional.