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That's the engine bay cooling fan. It should trigger once the temp in the engine bay reaches 180° F. It is not part of the engine cooling system. It's function is to reduce heat in the engine bay to prevent the charge from being too hot and to reduce the threat of fire - a concern for all mid-engine cars. You won't notice it when driving usually because sufficient air is drawn in the passenger side vent to keep the engine bay temps lower than 180, but idling, or in stop&go traffic, it should come on.
From your description, it sounds as if you have a bearing going bad in the fan motor. Plan on replacement sooner rather than later I'm afraid.
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