I think the liberty just has a mild case of Tourette's. it likes to make odd noises. Mine will do similar things. At times when motor is on or off, it will generate an odd sound from behind the dashboard. It actually kind of sounds like the is a multiple disk CD changer moving between disks. I'm sure there is some kind of electrical device explanation for it, but for now it doesn't cause any issues otherwise so I haven't bothered looking further into it.
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2011 Liberty Sport
2 KC Slimlite[RIGHT] 130 Watt Long Range on JK Bar
TMS Aluminum Roof Rack Cross Bars
Cobra 75, Firestik Door Jam Mount, HD Spring, 2Ft Firestik
Dunlop Fierce Attitude M/T