THERMAL MANAGEMENT SYSTEM FOR FUEL CELL VEHICLE HAVING MULTIPLE FUEL-CELL STACKS

A vehicle includes first and second fuel-cell stacks, a first coolant circuit including conduit arranged to circulate coolant through the first fuel-cell stack, and a second coolant circuit including conduit arranged to circulate coolant through the second fuel-cell stack. A heater is in fluid communication with at least the first coolant circuit. A valve arrangement is configured to proportion a flow of coolant between the first and second coolant circuits. The valve arrangement has an isolation position in which the first and second circuits are not in fluid communication and at least one mixing position in which the first and second circuits are in fluid communication. A controller is programmed to operate the value based on sensed conditions