NOVELTY - The system has a pump (100) controlling flow of cooling fluid through the system, and an onboard charger cooling fluid line (C) and a motor cooling fluid line (B) diverged in parallel from an outlet of a cooling fluid line (A) of the pump. A heater core cooling fluid line (D) and a radiator cooling fluid line (E) are respectively connected in parallel at a junction with an inlet of the fluid pump cooling fluid line and at a junction of outlets of the heater core cooling fluid line and radiator cooling fluid line. The pump cooling fluid line is provided at an outlet of the pump.    USE - Waste heat management system for use in a vehicle e.g. electric car, hybrid vehicle, and fuel cell vehicle.    ADVANTAGE - The heater core cooling fluid line and the radiator cooling fluid line are respectively connected in parallel at the junction with the inlet of the fluid pump cooling fluid line and at the junction of outlets of the heater core cooling fluid line and the radiator cooling fluid line, thus ensuring sufficient power of a battery of an electric car by efficiently utilizing the waste heat generated from the onboard charger and the motor, and hence increasing fuel efficiency of the electric car.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for the following:    (1) a method for managing waste heat of an electric car using an onboard charger cooling fluid line and a motor cooling fluid line that diverge in parallel from a fluid pump    (2) a computer readable medium comprising a set of executable program instructions for performing a method for managing waste heat of an electric car using an onboard charger cooling fluid line and a motor cooling fluid line.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic block diagram of a waste heat management system for use in an electric car.'(Drawing includes non-English language text)'    Cooling fluid line (A)    Motor cooling fluid line (B)    Onboard charger cooling fluid line (C)    Heater core cooling fluid line (D)    Radiator cooling fluid line (E)    Pump (100)