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that sound could be coming form anywhere. have you listened outside of the car? sounds like the compressor for the air bags.

did you open the engine room hood and listened in there to see if you can pinpoint the sound? maybe related or not, difficult to tell over the internet. i assume your car drives normally and there are no overheating issues correct? air blows cold? what about the dual zone, does that work as expected? if you dont have heat, its possible the heater core is the culprit. there is a valve that moves to change the coolant flow i believe and maybe this is causing the sound too?
 
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