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Q: NOISE on 2004 Buick Rendezvous

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
WHEN I START CAR ABOUT 10 TO 15 SECONDS LATER A NOISE COMES FROM UNDER THE CAR..BELOW DRIVERS SEAT....SOUNDS LIKE AN AIR COMPRESSOR....HASNT DONE THIS BEFORE...STARTED A COUPLE OF WEEKS AGO
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This exactly describes my problem with 2004 buick rendezvous ultra 3.6 v6--intermittent vibration noise from under drivers seat right almost immediately (10 seconds) after car is turned on and sitting in driveway and then while driving, vibration sound comes on for approx 10-15 seconds every few minutes, doesn't matter if air cond is on or off. Did you find any answers to this?
I have also heard such a vibration/ noise intermittently on my used 2004 Buick rendezvous CX coming from below the driver's seat . A local car service shop told me that this could be from the catalytic converter. But he said that its not that bad and it passed inspection.
sounds like the Level Control ( air suspension & ride control ) needs diagnosis as there are quite a few components that can cause this, better have a trained tech diagnose this.
didnt pay attention much but on other GM midsized suv's there is an air pump under the drivers seat, under vehicle, sounds like a jet turbine when the bearing goes bad, get used to it or part is $350+ "Fuel Evap System", did my best to lubricate but amount of condensation and moisture not sure if it worked but haven't heard back from customer