Hei, jeg lurte på det samme, 2016 D4, fant dette: "A changeover valve allows the heater coolant circuit to be isolated from the engine coolant during parked heating, to reduce the warmup time of the passenger compartment"
If the external temperature is between +15°C (59°F) and -20°C (-4°F), then the passengercompartment is heated using the engine's auxiliary heater. If the external temperature isbelow -20°C (-4°F), the heat is automaticallyi drected to the engine to assist engine starting
Once the engine has been heated sufficientlyheat will be directed to enable cabin heating providing battery state of charge is sufficient."
Men jeg fant ikke noe på å endre setting på ventil.