2006 Tahoe/A/C Issue

[Tchandler]

Need Help!
Have replaced radiator, condenser, compressor, orifice anything related to ac except hoses, all is new!
It’s blowing cold in back, but not in the front?? Just replaced the radiator fan and it’s not working!!
What now could it be?

 

[strutaeng]

Blend door/actuator?

 

[Scottydoggs]

X2 on the blend door actuator.