Abstract: A cooling system is provided for a vehicle having an electric power producing device and a power-plant operable to propel the vehicle. The cooling system includes a primary heat exchanger arranged relative to the power-plant. The primary heat exchanger is operable to receive coolant from the power-plant, reduce temperature of said coolant, and return the reduced temperature coolant to the power-plant. The cooling system additionally includes an auxiliary heat exchanger arranged relative to the primary heat exchanger, and operable to receive the reduced temperature coolant from the primary heat exchanger. The auxiliary pump further reduces the temperature of said coolant, and provides the further reduced temperature coolant to the electric power producing device. The electric power producing device may be employed in a hybrid vehicle, where the electric power producing device is a motor-generator operable to propel the vehicle.