NOVELTY - The method involves detecting state of charge (SOC) of battery when interior temperature of vehicle is lower than predetermined temperature set by driver. The interior of the vehicle is heated by operating the electric heater by power of the battery, when the SOC of the battery is above the predetermined lower limit. The interior of the vehicle is heated by the heater core, when the temperature of the coolant is increased above a normal operating temperature of the fuel cell stack, while turning OFF the electric heater.    USE - Heating control method for fuel cell vehicle (claimed) such as hybrid vehicle, motor vehicle, passenger automobile, bus, truck, watercraft, boat, ship, aircraft, electric vehicle, plug-in hybrid electric vehicle, hydrogen-powered vehicle.    ADVANTAGE - The temperature of the air for heating the interior of the vehicle is increased by heater core, so that the excessive power consumption due to the sole use of the electric heater is reduced and the fuel efficiency of the fuel cell vehicle is improved effectively. Since the control logic is added in the heater core and the waste heat of the coolant in the coolant line is utilized in the heater core, the cost of the heating control system is reduced. The rotational speed of the coolant pump and the opening degree of the three-way valve are controlled easily, so that the amount of coolant and the amount of heat supplied by the heater core is controlled. Thus, the heating efficiency of the heating control system is improved effectively. The amount of heat required to rapidly increase the interior temperature to a predetermined temperature can be controlled by the driver, so that the air-conditioning efficiency of the vehicle is improved. The insufficient amount of heat can be covered and compensated by the waste heat of the coolant, so that the capacity and size of the electric heater are reduced. The safety risk due to the high pressure conditions and the high voltage conditions required for the high capacity electric heaters are reduced effectively.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following:    (1) heating control system for fuel cell vehicle; and    (2) fuel cell vehicle.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic block diagram of the heating system.    Stack (10)    Controller (100)    Air-conditioning switch (101)    Outside temperature sensor (102)    Interior temperature sensor (103)