Cooling System: Notes
Due to the exhaust turbocharging system and the compact arrangement of the turbochargers in the V-space, the heat output of the N63 engine is very high. Correspondingly, great significance is attached to the cooling system. In addition, an indirect charge air cooling system has been developed for the first time where the charge air is cooled by an air-to-coolant heat exchanger. There are two separate cooling circuits for engine and charge air cooling.
COMPONENTS DESCRIPTION CHART
| Index | Explanation |
|---|---|
| 1 | Radiator |
| 2 | Radiator for transmission cooling |
| 3 | Coolant temperature sensor at radiator outlet |
| 4 | Electric fan |
| 5 | Characteristic map thermostat |
| 6 | Electric auxiliary coolant pump for turbocharger cooling |
| 7 | Coolant pump |
| 8 | Exhaust turbocharger |
| 9 | Heating heat exchanger |
| 10 | Duo-valve |
| 11 | Electric auxiliary coolant pump for vehicle heating |
| 12 | Vent line |
| 13 | Coolant temperature sensor at engine outlet |
| 14 | Expansion tank |
| 15 | Vent line |
| 16 | Transmission fluid-to-coolant heat exchanger |
| 17 | Auxiliary coolant radiator |
| A | Electric coolant pump for charge air cooling |
| B | Vent line |
| C | Intercooler |
| D | Expansion tank for charge air cooling |
| E | Radiator for charge air cooling |