The cooling system for a vehicle comprises a heat exchanger in which a condenser 200 comprising a plurality of tubes 112, 220; a pair of tanks 210; and fins 113, 230 and in which a condenser 200 comprised of portions 210B, 220, 230 through which the refrigerant is flowed is integrally formed with a first oil cooler 110 comprised of portions 210A, 112, 113 through which the oil is flowed; a radiator 300 which comprises a plurality of radiator tubes 320; a pair of radiator tanks 310; and radiator fins 330, and which is positioned at a down stream of the condenser 200 in the air blow direction; and a second oil cooler 120 which is provided in one of the radiator tanks 310 of the radiator 300.