Disclosed is a compact and integrated fan, pump, and heat exchanger system where air-cooling is performed via the fan, liquid cooling is performed via a pump, and heat exchange fins in thermal contact with a fluid channel act as a heat exchanger. Certain novel coated substrates, such as flakes, spheres and porous substrates are disclosed. In response to a decrease in the load requested of the engine, the engine is decelerated by causing the generator to generate power.