Faster is better.
The faster the coolant flows, the more even the internal temps are and the more heat can be rejected by the radiator.
the only reason to slow it down is to lower the heat rejection by the radiator so the engine can get to operating temp.
The faster the coolant flows, the more even the internal temps are and the more heat can be rejected by the radiator.
the only reason to slow it down is to lower the heat rejection by the radiator so the engine can get to operating temp.