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Sounds like my Maytag washing machine.

Hmmmmmmmmmmmmmmm. Perhaps an HVAC driver trying to get "home" or to a setting-feedback location????

Other than that - I got nutthin'
 

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2004 chevy trailblazer_ls_ext
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I would agree with RS. Does it sound louder from under the passenger side dash?
 

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2004 gmc envoy_slt
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https://www.reddit.com/r/CarRepair/comments/omaxje My 2004 chevy trailblazer has been making this really weird noise while sitting in park. Does anyone know what it is or how to fix it?
Assuming your engine runs smoothly and w/o outstanding idle quality issues........
My first candidate would be the motor mounts - where they have collapsed anywhere from 3/8 to 3/4".

Occurred on best friend's spouse's Trailblazer where he thought it had a miss at idle, and she just noticed the steering wheel subtly vibrating and the shifter you could feel vibrating at same frequency when grasped.

Experienced similar again with my own 04 Envoy purchased a few years later.

I'd be extra suspicious if OEM mounts. They can last from 6 -10yrs+.
That said, only, ONLY go back with GM oem mounts; Get em at rock auto, etc. They are hydraulic and sophisticated, hence the seeminly $$$ cost.
 
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