My beetle 18T sounds like a jet engine when I start it up. Very loud whirring that is high pitched squeal. It is only when the car has been left overnight (cold) and the noise stops after 30 seconds. Last summer I had a catastrophic overheat and had to replace waterpump, timing belt, temp sensor, head gasket and valves.
This noise started a few months after that. Since the repair my emissions light was on and the code was secondary fuel injector leak. However, a month or so ago this light went off.
Its your secondary air pump. it turns on in the cold morning to inject more air into your exhaust, something about emission. its normal to be high pitched. once on my car it was way loud, i looked and the hose had disconnected. either way its normal if its not super loud. but if its everyone is looking at me loud then check for loose hoses!
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sounds like your secondary air pump. sounds like a hoover vaccum, i assume. with the hood open, check the (approx 1/4 inch plastic ribbed) tubing for air leaks.
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