BMW 5 Series: Cold-start phase
Point A in the heat management module circuit diagram designates the cold start with an engine that has completely cooled down.
Cold-start phase, Bx8TU engine
In the cold-start phase, the coolant circulates exclusively via a bypass in the coolant pump. The rotary valve in the heat management module closes the coolant lines so that the excess pressure that builds up opens the pressure relief valve in the coolant pump (opening pressure 2.1 bar) and the coolant is recirculated in the coolant pump.
Because the coolant circuits through the exhaust turbocharger and the ventilation line of the cylinder head cannot be closed, a low volumetric flow is returned to the coolant pump here.
Warm-up phase
Area B in the circuit diagram for the heat management module shows the opening angle of the rotary valve in the warm-up phase.
Warm-up phase, Bx8TU engine
In the warm-up phase, the heat management module additionally opens the connection to the heating in addition to opening the bypass line. The coolant flows through the cylinder head, the exhaust turbocharger and the engine oil/coolant heat exchanger. The electric split cooling valve is closed; no coolant flows through the engine block (split cooling).
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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 operat
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
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Operation
General information
This chapter describes functions that are operated
in a different way to the way they are operated
in the front, or are only available in the rear.
Music hard disk
Saving of music via CD/DVD is only possible
in front.
The export and import of data is only possible
via the US
Introduction
New features in the G30
The G30 builds on the technology introduced in the 7 Series (G12). This
Training manual describes
the new features or changes with regard to the G12.
The table below lists the new features and changes in the G30 compared to the
G12:
Further information
The functions in th
