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I believe this is called the auto hvac system (a right and left knob up front for temp control, not a slider), with rear heat and ac.

My brand new to me 05 z71 Hoe had no rear ac. Searching around on the inter webs found this awesome resource! I checked my rear actuator for movement when changing from hot to cold and saw no movement at all. I got excited thinking it was that easy of a fix. However when I pulled that off but...