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it's the blend door actuator for the hvac, try adjusting the heat/cold control down just a hair that usually stops it, if not then you may have to replace it
my ex wife's suburban does the exact same thing only her's has the sliding control, if you adjust the right side down just a hair it stops making the noise.
I haven't messed with it beyond that but I would venture to guess the actuator needs to be replaced.
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