Or maybe a snowy owl? When ever I switch from front defrost to any other setting it makes this noise. I have attached a Youtube video of it.
" title="2015 Acura TLX heater - YouTube" target="_blank">2015 Acura TLX heater - YouTube
" title="2015 Acura TLX heater - YouTube" target="_blank">2015 Acura TLX heater - YouTube