Air-conditioning device for a motor vehicle, comprising - a refrigerant circuit with ∘ a compressor for compressing refrigerant, ∘ a first internal heat exchanger that is connected downstream of the compressor in the direction of refrigerant flow, is designed as an air-to-refrigerant heat exchanger and can be operated as a condenser, and ∘ a second internal heat exchanger that is connected downstream of the first internal heat exchanger in the direction of refrigerant flow via an expansion valve (141, 142), is designed as an air-to-refrigerant heat exchanger and can be operated as an evaporator, as well as - a coolant circuit with ∘ a coolant pump (211, 221) and ∘ a chiller thermally coupled with electrical drive components of the motor vehicle, wherein the coolant circuit and the refrigerant circuit are thermally coupled with one another via a coupling heat exchanger designed as a coolant-to-refrigerant heat exchanger, and the circuit arrangement consisting of the coolant circuit and the refrigerant circuit has an external heat exchanger that is thermally coupled with the ambient air of the motor vehicle and is different from the coupling heat exchanger, wherein the external heat exchanger is designed as an air-to-coolant heat exchanger integrated into the coolant circuit, wherein the coolant circuit has two coolant sub-circuits (210, 220), specifically a first coolant sub-circuit comprising a first coolant pump, the external heat exchanger and the coolant-side part of the coupling heat exchanger, and a second coolant sub-circuit comprising a second coolant pump and the chiller, and wherein the coolant circuit has switching devices by means of which the coolant sub-circuits (210, 220) can be separated from one another in a first switching position, characterized in that the coolant sub-circuits (210, 220) can be connected to each other by means of the switching devices in a second switching position in such a manner that the coolant-side part of the coupling heat exchanger, the external heat exchanger and the chiller are flowed through one after the other by the coolant. - a refrigerant circuit with ∘ a compressor for compressing refrigerant, ∘ a first internal heat exchanger that is connected downstream of the compressor in the direction of refrigerant flow, is designed as an air-to-refrigerant heat exchanger and can be operated as a condenser, and ∘ a second internal heat exchanger that is connected downstream of the first internal heat exchanger in the direction of refrigerant flow via an expansion valve (141, 142), is designed as an air-to-refrigerant heat exchanger and can be operated as an evaporator, as well as ∘ a compressor for compressing refrigerant, ∘ a first internal heat exchanger that is connected downstream of the compressor in the direction of refrigerant flow, is designed as an air-to-refrigerant heat exchanger and can be operated as a condenser, and ∘ a second internal heat exchanger that is connected downstream of the first internal heat exchanger in the direction of refrigerant flow via an expansion valve (141, 142), is designed as an air-to-refrigerant heat exchanger and can be operated as an evaporator, as well as - a coolant circuit with ∘ a coolant pump (211, 221) and ∘ a chiller thermally coupled with electrical drive components of the motor vehicle, ∘ a coolant pump (211, 221) and ∘ a chiller thermally coupled with electrical drive components of the motor vehicle,