Rear a/c blowing hot air,
While replacing the actuator in the rear, I noticed it has 2 actuators
I am unsure if the top actuator I replaced is the one that controls the duct opening/closing or the bottom actuator.
The one on top was replaced with a new one. Bottom one is still the original. It i still blowing hot air.
I have already attempted the calibration part with removing battery terms for 15mins (reconnecting back) and still no change.

Kindly Help !!1 Thanks in advance.

 

Looking at the diagram for your rear HVAC on the 2011 Tahoe, the upper actuator is the mode actuator - i.e. blow from the roof vents versus the floor vents. The LOWER actuator is the air temperature actuator.

https://charm.li/Chevrolet/2011/Taho...with%20CJ2%29/