2012 Chevy Suburban A/C not blowing in front?

I have a 2012 Chevrolet Suburban.  The vehicle is currently not under warranty and I
can’t find any service bulletins related to my model year and what I am experiencing.  
The AC Blower quit working in the front.  It works fine in the rear, high and low, hot and
cold, even defrost.  When I turn off the rear and use just the front, I can hear the
system changing when I put the digital monitor from defrost to front blowers.  The only
time I can feel cool or hot air moving through the system is when the car is moving.  
Any idea about what my problem could be?  Blower Resister?  Blower Motor?  Also, if
you could please provide me with a schematic of the A/C system.  I haven’t been able
to find anything online for my model year.  Thanks for your help!

2012 Chevrolet Suburban
Dual Digital Thermostat