04 Tahoe, No Rear Heat

[Maxbaby]

Hey all

 

I have an 04 Z71 and today noticed that the rear heat is blowing cool air no matter what the position of the rear heating controls. I've been surfing around a bit and found reference to this being a known problem; possibly one of the two actuators and/or the CPU needing to be reprogrammed.

 

Anyone familiar with this problem and if so, the solution?

[ScottyBoy]

I've read somewhere that there is an actuator driven door for the rear just like the front. That door opens and closes to to switch the airflow from hot to cold. I think its called the "blend door actuator".