A device (1) for the thermal management of a vehicle cabin and of at least one electric component (13) of an electric drivetrain of said vehicle includes a heat-transfer fluid circuit (3) through which there flows a heat-transfer fluid. The device (1) also includes at least —a first heat-transfer fluid loop (4) made up of at least a first pump (7), a heat source and an internal heat exchanger (9) able to heat the cabin, and —a second heat-transfer fluid loop (5) in parallel with the first loop (4) and interconnected therewith by a first interconnection device (6). The second loop (5) including at least a first exchanger (11) of the electric component (13), characterized in that the heat source is able to heat the heat-transfer fluid circulating in the first heat-transfer fluid loop (4) and/or in the second heat-transfer fluid loop (5).