The radiator plays a very important role in an automobile. It dissipates the waste heat generated after the combustion process and useful work has been done to prevent engine overheating. The effectiveness with which waste heat is transferred from the engine walls to the surrounding is crucial in preserving the material integrity of the engine and enhancing the performance of the engine. This book looked at the effect of sand blocking the heat transfer area of the radiator and its effect on the engine coolant through the conduct of experiments and a mathematical model developed. This book shed some light on the radiator modeling using Matlab simulation to assess the effect of dirt on the blockage of the radiator on the performance of an engine cooling system. This book provide useful information for all Engineers or anyone else who may be using vehicle and are interesting in knowing more about radiator and Engine Cooling System.