BMW 5 Series Owners & Service Manuals

BMW 5 Series: Operating temperature

The positions of the rotary valve at engine operating temperature are shown by area C of the circuit diagram.

Operating strategy of the heat management module
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.

Maximum cooling requirement

The maximum cooling requirement is shown at point E of the heat management module circuit diagram.

Operating strategy of the heat management module
Maximum cooling requirement, Bx8TU engine

To provide maximum cooling at high dynamic loads and/or high ambient temperatures, the radiator connection is fully opened (100%) and the small coolant circuit is completely closed. Additionally, the heater circuit is 90% closed to achieve the maximum cooling thanks to the maximum coolant volumetric flow through the large coolant circuit.


     Coolant pump

    The layout and function of the coolant pump have been revised and adapted to match the cooling concept of the Bx8 TU engines. Coolant pump, Bx8TU engine Pressure relief valve closed (pr

     Intake Air and Exhaust System

     Crankcase monitoring

    On-board diagnosis Feed-in point of the blow-by gases to the clean air line upstream from the exhaust turbocharger Non-return valve Connection to exhaust turbocharger Captive screws Crankcase


     Power distribution box, front right

    Power distribution box, front right A relay for terminal 30B is installed in the front right power distribution box. Consumers are supplied with terminal 30, terminal 30B and terminal 15N and provided with corresponding fuse protection by the front right power distribution box. Terminal 15N is

     Selection lists

    General information Depending on your vehicle's equipment, the following can be displayed or operated using the buttons and the thumbwheel on the steering wheel and via the displays in the instrument cluster and the Head-up Display: Current audio source. Phone redial. Activating a list and adjus

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