BMW 5 Series Owners & Service Manuals

BMW 5 Series: Operating strategy of the heat management module

BMW 5 Series G30 2016-2023 Training Manual / B58TU Engine / Cooling System / Operating strategy of the heat management module

The following graphic shows the positions of the rotary valve as the coolant temperature increases.

Operating strategy of the heat management module
Circuit diagram of heat management module in B58TU engine

0 % - Rotary valve closed
100% - Rotary valve open

  1. Cold start
  2. Warm-up phase
  3. Operating temperature
  4. Transition from normal operation to maximum cooling requirement
  5. Maximum cooling requirement

x - Rotational angle in angular degrees

  1. Heater circuit
  2. Main coolant circuit
  3. 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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