Same problem, just did a quick fix less than 5 min Underneath drivers side above gas pedal you will see the actuator. If you get your head all the way under (you will need lots of light) you will see the white plastic controller that rotates when you turn the air from floor to defrost. in this white plastic you will see the slots with little pegs that push thru that control the vents. With engine on, ac high I dislodged the peg on the right side and pushed it backwards....... Bam....Now have ac out my front vents..... ❄❄❄❄Djgreen, did you ever find the fix
I just purchased a 2005 Titan, and it has the exact same issue.