This paper of ours deals with the automotive radiators. We have shown a computational fluid dynamics (CFD) modelling simulation of mass flow rate of air passing through an automotive radiator. Modelling has been done in Solidworks and exported to ANSYS for CFD analysis. In our paper, the main implication that we have drawn is that the heat which is been transferred by a radiator is a function of the airflow at different air velocity. We undertook this experiment on a single radiator of constant geometry on the basis of some parameters like the material of the radiator and the vehicle’s speed. The thermal analysis is done for different velocities of air mixture passing through different tube materials such as aluminium and stainless steel. The numerical results were compared and results obtained served as a good database for the future investigations. © 2021, Springer Nature Singapore Pte Ltd.