Ac can will not blow in dash or floor but will in rear

What is your question?

This problem has happened maybe 3-5 times in last 2 weeks but has always corrected itself and started working on its own. When ac is on it cold air will Not blow out of dash or floor vents but does out of rear vents Help... it’s HOT!!!

What makes this problem better or worse?

Nothing just random

How long has your 2012 Chevrolet Tahoe had this problem?

On and off for 2 weeks