BMW 5 Series: Operating strategy of the heat management module
The following graphic shows the positions of the rotary valve as the coolant
temperature increases.

Circuit diagram of heat management module in B58TU engine
0 % - Rotary valve closed
100% - Rotary valve open
- Cold start
- Warm-up phase
- Operating temperature
- Transition from normal operation to maximum cooling requirement
- Maximum cooling requirement
x - Rotational angle in angular degrees
- Heater circuit
- Main coolant circuit
- Minor coolant circuit
The openings on the rotary valve vary the cross-sections of the different
coolant ducts as a function
of the rotational angle of the rotary valve. The following graphics
schematically represent the various
engine operation phases, from cold start to maximum cooling requirement.
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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 c
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
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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Safety information
Warning
An open trunk lid protrudes from the vehicle
and can endanger occupants and other traffic
participants or damage the vehicle in the event
of an accident, braking or evasive maneuvers.
In addition, exhaust fumes may enter the car's
interior. There is a risk of injury or ri
Electrically adjustable seats
Thigh support
Forward/backward, height, seat tilt
Upper backrest
Backrest width
Lumbar support
Backrest tilt, head restraint
Adjusting the head restraint
Adjusting the height: power head
restraints
Push switch up or down.
Adjusting the distance: manual head
re