Automotive engine cooling system takes care of excess heat produced during engine operation. Radiators are used for cooling internal combustion engines, piston engine aircrafts, railway locomotives, stationary gearing plants or any similar use in industrial and domestic applications. The flow behavior of coolant fluids in radiator tubes is of great importance to the designer. The proposed work throws light on geometrical aspects which are used in the core of radiators. Also it focuses on developments in geometric parameters of tubes, flow of coolant through tubes which influences radiator performance. Finally case studies of radiator prototypes are proposed which generates the scope for reduced size and flexibility for coolant flow throughout the radiator.