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.
READ NEXT:
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
SEE MORE:
Concept
The AUTO program cools, ventilates or heats
the car's interior automatically.
The air distribution and temperature are controlled
automatically depending on the temperature
in the car's interior and the desired temperature
setting including the selected intensity of the air
flow.
Switching
Overview
Control Display, with touchscreen depending
on the equipment version
Controller with buttons and, depending on
the equipment version, with touchpad
Control Display
General information
To clean the Control Display, follow the care instructions.
In the case of very high temperatures o