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The radiator as heat exchanger plays a very significant role in an engine cooling system by maintaining the coolant at an optimum temperature. The present study aims at improving the performance of an automobile radiator by using nano-coolants. Nano-scale particles have been tested and proven to have enhanced thermal conductivity than their bulk counterparts due to their increased surface area-to-volume ratio. Thus the nanoparticles dispersed in the base fluids called nanofluids are used as a radiator coolant to improve the performance of the radiator. Aluminum oxide (Al2O3)-based nanofluid at 0.04%, 0.08%, 0.15% by volume concentrations is used in two different base fluids, one being water and the other ethylene glycol (30%) (EG)-water mixture. Coolant is supplied at three different inlet temperatures at 40°C, 50°C, and 60°C and at five different flow rates ranging from 2 L/min to 6 L/min at an interval of 1 L/min.