Motor vehicle heat transfer medium circuit

The invention relates to a heat transfer medium circuit for a motor vehicle, in particular for a passenger vehicle, comprising: a first sub-circuit having at least one heating device (111, 115) for heating a heat transfer medium flowing through the first sub-circuit and/or at least one cooling device (104) for cooling the heat transfer medium flowing through the first sub-circuit; a second sub-circuit having at least one electrical energy store (202), which can be heated and/or cooled by means of a heat transfer medium flowing through the second sub-circuit, for supplying at least one electric motor (301) for driving the motor vehicle; and-a mixing device (400; 500); 600) in the housing; the mixing device can be selectively switched to:-at least one first operating state for feeding a first portion of the heat transfer medium flowing in from the first sub-circuit into the second sub-circuit; and-at least one second operating state for feeding a second portion of the heat transfer medium flowing in from the fi