Recently, I get a loud hum when my HVAC fan is at max. Can I fix this myself? on 2007 Volkswagen Eos

One auto mechanic told me this is a "normal hum", but it definitely is not. The compressor is in fine working order, I can still get cold air. It sounds like something may be in the fan unit itself, but I am unsure how to find it and check.

Asked by for the 2007 Volkswagen Eos