Could anyone give me answers, on a serious note?

So I have took to Yahoo Answers, and other forums specific for my vehicle's dealership. Please serious, and kind answers only..

So I drive a 2010, Porsche Panamera in Amethyst Purple, fully optioned out, 35K miles. My father financed it, yet doesn't drive it. So he handed the keys for me, and now it's my DD.

Bear with my if I explain this in a confusing matter:

The Panamera I drive, unlocks and lock's itself without ever even touching the key. When I open the driver's door, and the car unlocks.. there is this immediate noise.

In explaining the noise, it's kind of confusing. It sounds like a release of air but it also bubbles. LOL does that make sense? I'm a very vehicle savvy person, so I think that there is some type of compression that mixes the gas in the gas tank, so that the engine is not sucking up gas that has been sitting? I could be very wrong. Did I mention that this noise seems to be coming from the rear, possibly the area under the rear occupant's seats?

I know it has air suspension, so maybe that has a key in this matter.. but I don't know what the bubbling of liquid would be?

Just wondering, I've had bad luck at the other forums, and people saying unnecessarily rude things.

Thanks.