There is an intermittent noise somewhere in the dashboard that sounds like a card in spokes. It seems to come and go randomly, i.e. not particularly associated with fan speed, temp adjustment, etc. It has recently begun occurring more frequently. Maybe an air control valve? Anyone else run across this problem?
Sounds like a card or piece of paper found its way into the vents on the dash and occasionally rubs against the blower fan.
My guess . . . one of the hvac actuator motors
this is very common, on many different brands