I hope mine doesn't have air suspension since this thing has enough bells and whistles that can fail as it is.

Its still pouring rain here but I have been paying attention since this thread when getting in and I think the sound is the fuel pump like mentioned.

I never had a bmw that did that before so never considered that it could be running the fuel pump just by opening the door.

To show how little I have paid attention to the thing since buying it I found out last night it has electric folding mirrors. Didn't even notice that till now.

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Just BMW's - All cars and trucks was two pages long
1994 318is
1997 528i
2000 323i
2001 X5 3.0 auto
2005 X5 3.0 auto
2011 535xi auto
2013 X5 xdrive35 Turbo
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Aftermarket E53 Radio Install