BMW 5 Series Owners & Service Manuals

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.

Operating strategy of the heat management module
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.

Operating strategy of the heat management module
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).


     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

     Intake Air and Exhaust System


     Harman Kardon system

    System wiring diagram G30 System wiring diagram, Harman Kardon system Tweeter, front center Mid-range speaker, front center Headunit Mid-range speaker, front right Tweeter, front right Bass speaker, right Mid-range speaker, rear right Mid-range speaker, storage shelf on left Tweeter, left

     Operating via the Controller

    Opening the main menu Press the button. The main menu is displayed. All iDrive functions can be called up via the main menu. Adjusting the main menu 1. Press the button twice. All menu items of the main menu are displayed. 2. Select a menu item. 3. To move the menu item to the desired position

    © 2019-2024 Copyright