Vehicle heating system and method using a PTC heating device

Vehicle heating system, using a PTC heating device, which outputs comprising an input unit for inputting setting temperatures of a driver's seat and a passenger seat, a control unit, the PWM control signals to the respective outputs of a left Heizquellenabschnitts and a right Heizquellenabschnitts formed in the PTC heating device to control, based on the set temperatures, which are input by the input unit, and a power supply unit, the energy of the left and the right Heizquellenabschnitt Heizquellenabschnitt supplies in accordance with the PWM control signals output from the control unit.