Variations
• In addition to cooling the engine itself, some radiators contain a separate core for cooling engine oil. This is essentially a small radiator located near or attached to the main radiator, but functions in much the same way. In addition to cooling engine oil, some radiators are designed to cool transmission fluid as well. Collectively, radiators that cool more than just the engine are known as "supplemental radiators."
Another kind of supplemental radiator is sometimes used on cars that feature an intercooler as part of a turbocharger or supercharger system. The intercooler is used to cool the air that will be compressed by the turbo- or supercharger before it is forced into the engine for combustion.