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Message: <blockquote data-quote="zeedo" data-source="post: 376802" data-attributes="member: 10193"><p>Can't think of any relation between engine vibration and low water level in expansion tank. But for E46, if your radiator does not leak then it could be leaking at your water level sensor (bottom of the expansion tank) or on the hoses. There are three main hoses and sometimes when the engine is cool you won't see any leak. It starts leaking once engine is at operating temperature (high Pressure & Temp). I kena once with the hose at the bottom (spilts to three branches), the part is RM330 and can just plug ang play, only needs a lot of effort to pull it out. If top hose, careful not to break the connection with the radiator. (this example is from N42 by the way)</p></blockquote><p></p>