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Update: Yes, it was a loose squirrel cage fan. Actually both fans were loose. A long reach 1/8" allen wrench tightened up the set screws.
For future reference: After accessing them from the top, I think I could have accomplished it easier from below.
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2016 Montana High Country 310RE
2020 Chevrolet Silverado 3500 HD LT CC 4x4 Duramax 
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