I have heard this is could be a sign of thermostat or water pump. Could be something as simple as a o2 senor however. Id go in to indy shop and just get it checked out. Reason being is that if it is water pump, better to get that fixed then to be stranded on the side of the road.
But I live in Waterloo ON and I know it has been crazy hot. Mine has turned on also and is loud. But I was stationary for a bit so I know the fan kicked in to get air flowing.
Keep us updated!
Mike
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