BMW B58TU Reference Manual page 28

B58TU￿Engine
4.￿Cooling￿System
4.3.3.￿Operating￿temperature
The￿positions￿of￿the￿rotary￿valve￿at￿engine￿operating￿temperature￿are￿shown￿by￿area￿C￿of￿the￿circuit
diagram.
Operating￿temperature,￿Bx8TU￿engine
The￿graphic￿shows￿control￿with￿the￿engine￿at￿operating￿temperature.￿The￿position￿of￿the￿rotary￿valve
means￿that￿the￿cross-sections￿of￿the￿respective￿coolant￿lines￿are￿open￿to￿a￿greater￿or￿lesser￿extent
depending￿on￿the￿coolant￿temperature.￿The￿coolant￿flows￿with￿a￿varying￿volumetric￿flow￿through￿the
small￿coolant￿circuit,￿the￿large￿coolant￿circuit￿and￿the￿heater￿circuit.￿Depending￿on￿the￿load￿request,
the￿crankcase's￿coolant￿connection￿is￿opened￿by￿the￿electric￿split￿cooling￿valve,￿thus￿cooling￿the
crankcase.￿Large￿engine￿operation￿ranges￿are￿covered￿with￿the￿crankcase￿coolant￿circuit￿closed.

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