Cooling circuit for vehicles operated by means of fuel cells

A method for controlling a fuel cell vehicle cooling system including:

• a first circuit having an indirect evaporator and an indirect condenser;
• a low-temperature second circuit including a first partial circuit configured to cool fuel cell electronic control components, a second partial circuit configured to cool electric drive system electronic control components, and a third partial circuit including the indirect condenser;
• a third circuit configured to cool a vehicle traction battery;
• a high-temperature fourth circuit configured to cool vehicle fuel cells;
• a plurality of liquid coolant pumps selectively controllable to pump liquid coolant through one or more of the first, second, third, and fourth circuits;
• and a plurality of controllable valves configured to control liquid coolant flow through the second circuit and the third circuit, wherein a first controllable valve of the plurality of controllable valves controls coolant flow between the second circuit and the third circuit, and wherein the first controllable valve is the only valve in the second circuit and includes one inlet and four outlets, the method comprising, by a programmed controller:
• controlling the first controllable valve so that no coolant flows through the second circuit and the third circuit in a first switching mode of the first controllable valve.