Various embodiments include a combined cooling and extinguishing system for a motor vehicle, the system comprising: a cooling system circulating carbon dioxide as a coolant, the cooling system including a compressor, an evaporator, an expansion valve; and a condenser; an extinguishing system including a pressure vessel storing compressed CO2; and a control valve connected to the pressure vessel and to the cooling system. The control valve includes a first setting to supply CO2 from the pressure vessel to the cooling system and a second setting to supply CO2 from the cooling system to the pressure vessel.