Just went through this with my 09 i work for a ford dealer that also has a chevy store. took it over to them and they reinitiated my blend door actuator. the actuators are timed just like your engine and sometimes go out of time. if this doesn't fix it it will need the actuator.
96xxx on my 09 Tahoe
Plugs and wires
trans flush to synthetic
transfer case service to synthetic
Front and Rear Diff service to synthetic
and the damn rear de-frost wires
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