The cooling system on the BMW Z4 sDrive35i engine consists of a series of radiator and oil cooler isolated circuit. The function of the isolated oil cooling circuit ensures that the heat is not inserted through the engine oil into the engine cooling system. The structure of the cooling circuit on this machine similar to the N52 engine. This machine is flushed through the coolant in accordance with the concept of cross-flow. This machine can also be equipped with an automatic gearbox, to utilize the lower area of the radiator to cool the gearbox by using the gearbox oil cooler. This can be achieved as in the N52 engine with the control sleeve, which is incorporated into the radiator tank.

The following schematic illustrates the 2009 BMW Z4 sDrive35i Engine Cooling Circuit Diagram:

2009 BMW Z4 sDrive35i Engine Cooling Circuit Diagram

  1. Radiator
  2. Gear-box oil cooler
  3. Outlet temperature sensor
  4. Engine oil cooler
  5. Thermostat for gearbox oil cooler
  6. Map thermostat
  7. Electric coolant pump
  8. Exhaust turbocharger
  9. Heat exchanger
  10. Outlet temperature sensor cylinder head
  11. Thermostat, engine oil cooler
  12. Coolant expansion tank
  13. Vent line
  14. Gearbox oil cooler
  15. Fan

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