Automotive radiator is a key component of engine cooling system. The demand for more powerful engines in smaller hood spaces has created a problem of insufficient rates of heat dissipation in automotive radiators. As a result, many radiators must be redesigned to be more compact while still having sufficient cooling capabilities. Radiator size mainly depends on core for heat rejection requirement. Conventional radiator fins are limited to aluminium, one of our approach is replacing the fin material with MWCNT (Multi wall carbon Nanotube) composite to improve heat dissipation and also reduce the overall size of the radiator.