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Hello, can you pull the serpentine drive belt, pull it all the way off the crankshaft, crank and let the engine run for less than a minute (it won't overheat) and see if you still have the noise then? I doubt it's an exhaust leak if it sounds like a belt squeal. Are you the one that replaced the belt and tensioner etc.?
Ok, so it is not anything that turns with the belt. is it a whistle? high pitched? like a vacuum leak?