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· SilveradoSierra Guru
2004 Sierra 3500 6.0L, auto, extended cab, cab&chassis, upgraded to 4wd
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3,172 Posts
How exactly is it not working?

I also have an '04, just w manual controls, but your ducting setup should be the same.

With a flashlight (and maybe removing the duct section pointing down at the drivers legs), at the mode actuator & cam to see how it moves as the mode's are switched. If def works, and floor works, 1/2 def/1/2 floor is between those two points on the cam (so for def, the cam is turned to it's limit in one direction, floor is in the middle, for split the cam is between those two points).
 

· Member Extraordinaire, SilveradoSierra Guru
2010 GMC All Terrain 4x4 5.3 LC9 211k mi
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18,553 Posts
Do you hear air blowing when on defrost and floor? Is it still coming out of the front vents or what? Some additional details will help. Have you watched the cam movement mentioned by Dave above? Are you sure you got it correctly re-connected? That cam can be tricky to get back in the proper detents to drive the doors.
 
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