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Have the sound investigated immediately as from your description it may be a major engine failure in the making. If it is then the fix will be another engine and that will be expensive.;
This could be a number of things and a car is difficult to diagnose from sounds as th nature of it means that the sound does not always come from where it sounds like it is. Try - wheel bearings (usually a high pitched squeal) - Big or little end bearings if the engine has been run low on oil. It is an auto I assume so could be gear box. It could be something really simple like engine mounts and the vibrations of the engine are passing to the metal body as the rubber has come away.
That noise is probably the air injection system which is part of the emmision system. When it is making that noise, open the hood and determine where it is coming from, note if it is a mechanical sound, etc. The air injection if equiped would sound almost like forced air scaping somewhat like an exhaust leak, but less intense.
oh ok, you probably have air shocks and that is the compressor running... makes sense that it sounds with the engine off... it should not be a loud sound though, normally it's quite quiet and you only hear a faint noise... if it is that loud it's probably a bad compressor
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