[Qsilver7]

Here's some info about the N63TU's cooling system circuits (yes multiple circuits as mentioned above).

Hopefully the info below will be helpful with understanding the complexity of the 3 cooling circuits found on the N63TU engine (which is slightly different than the original N63 engine's systems).

1. Engine Cooling Circuit
2. Turbo Charging Circuit
3. Charge Air & DME Cooling Circuit