Odd noise coming from behind the driver-side dash

Hey Ken, thanks for the reply. Noise is on the driver's side, low, near mid-dash. My best guess is the actuator for the air mix. Nothing changes tempo though. Driven, parked, AC/heat, fan on/off, temperature up/down. Same sound. The only difference is the sound is minimal when first started and increases in volume within ten minutes. I'm too big to get down there to pull the cover and investigate further. A couple Google videos seem to roughly identify a similar sound as the air mix actuator. Since I can't physically get in there, I'm probably looking at paying out the nose to fix it. I can deal with the noise, but the wife can't. Heat and cool still seem to get where it's supposed to go, so I'm not 100% sure of the diagnosis. Perhaps it's on the way out and will fail completely at some point. Need some little dude to get in there.

Also, no lights or warnings. I have one of those diagnostic chips, but no-fault codes thrown. I thought of a relay, but it does not sound quite like a relay, in my opinion. It is more mechanical than a clicking relay. I think a relay would be more 'even' sounding too. Again, in my opinion and experience with faulty relays.