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Weird Humming noise

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I get a weird humming noise while accelerating that appears to be coming from the coolant header tank. 


Has as anyone else had this? It’s as if the cooling circuit is over pressurising and being released from the valve...


Doesnt at all sound like a turbo spooling or whining


Also I have my car it’s firs oil/filter change and a clear hose (lightweight, approx 1ft long) dropped out... originated somewhere on the engine front of the engine and dropped clear - possible a drain hose of some type...? 


Any ideas?

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