Front defogger not blowing

Prius V 2012
When I turn on the defogger there is no air blowing by the front window. I am able to switch from higher and feet vents (those work fine) but nothing comes out when I select the defogger. Also, when I turn on the defogger the sound changes a bit (the sound always changed, just mentioning it)

Any ideas what it can be?
Ways to troubleshoot or fix it?

Thanks

 

Alright, the servo behind the glove is working. So, something else broke.

 

Any way to open it without taking the whole dashboard apart?

 

Thanks for the reply,
Any place I can find the service manual?