In the cooling system of the automobile engine, the water which is used as a coolant is evaporated due to high engine temperature, so it is needed to add some additives to the coolant water but it does not give it high performance compared to adding some of Nano-particles. This work aims to do an investigation in heat transfer characteristics with Nano-fluid, which has revealed that when Nano-particles are introduced to a conventional fluid in certain concentrations they enhance the ability to transfer heat, has the benefits of lower energy costs and the environmental impact. This enhancement leads to reduce the radiator frontal area which results in reducing the frontal area of the vehicle that leads to lowering the coefficient of drag (resistance of the air for the moving vehicle) consequently reduces the fuel consumption. Two types of Nano particles metal (Cu) and metal oxide (CuO) are used to prepare coolant Nano-fluids with different concentrations. Also, the pump characteristics using Nano-fluid as a fluid are investigated.