A car's cooling system is one of its most vital components. Engines rely on their cooling systems to remove immense amounts of heat that if allowed to accumulate would cause engine failure. Their are two types of cooling systems; air cooled and liquid cooled engines. Air cooled engines utilize metal fins that radiate off the combustion chamber. These fins provide greater surface area to radiate heat into the air. This is utilized extensively on motorcycle engines and also the Porsche flat six is a famous automotive air cooled engine. A liquid cooling system is a series of fluid path ways that transport a cooling fluid. This fluid is usually a 50/50 mixture of antifreeze to water. This fluid removes heat from the engine as it flows through passageways cast into the engine block. This fluid circulates to a radiator that has many metal fins. Cars have grilles and louvers that direct air flow across the radiator releasing heat into the air.