BMW 3 Owners & Service Manuals

BMW 3: Coolant pump

The layout and function of the coolant pump have been revised and adapted to match the cooling concept of the B46TU/B48TU engines.

Coolant pump
Coolant pump

  1. Pressure relief valve closed (pressure < 2.2 bar / 32 psi)
  2. Pressure relief valve opened (pressure > 2.2 bar / 32 psi)

A pressure relief valve is installed in the mechanical coolant pump housing. In combination with the heat management module, the pressure relief valve on the one hand ensures that the engine operating temperature is reached more quickly, while at the same time reducing leaks and component damage due to high pressure in the cooling system.

If an excess pressure of more than 2.2 bar (32 psi) builds up in the coolant circuit, the pressure relief valve opens and releases a bypass channel. The coolant is now exclusively circulated in the pump body. Once the pressure drops below 2.2 bar (32 psi), the pressure relief valve closes and the coolant is again routed through the coolant ducts.


     Exhaust System

    Exhaust turbocharger Exhaust turbocharger The exhaust turbocharger can be replaced individually and is exclusively made of steel. The boost charge pressure is still controlled by an electrical waste

     Fuel System

    The fuel system is made up of the fuel supply and fuel preparation systems. The fuel supply includes the fuel tank with all mounted parts and the fuel lines up to the engine compartment. The fuel p

     Fuel preparation

    The fuel preparation has again been adapted to meet the emission legislation requirements. The high pressure pump and the injectors have been revised and designed for an fuel injection pressure of 3


     Regenerative braking

    The regenerative braking makes possible brake energy regeneration. The electrical machine works here as an alternator and brakes the gears via automatic transmission - propeller shaft - rear axle differential - output shafts. The high-voltage battery unit is charged with the energy

     Using this Owner's Manual

    Orientation The fastest way to find information on a particular topic is by using the index. An initial overview of the vehicle is provided in the first chapter. Validity of the Owner's Manual Production of the vehicle At the time of production at the plant, the printed Owner's Manual is the most c

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