Engine Cooling: Notes
The engine cooling system undertakes the classic task of carrying heat away from the engine and maintaining a defined operating temperature as constant as possible. As on the N54 engine, the two turbochargers are also cooled.
The N63 engine features a conventional coolant pump that is driven by the belt drive. This pump cannot be used to continue cooling the turbochargers after the engine has been shut down.
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 |