The blend door actuator on the late model Chevy Tahoe is located behind the dash in the glove box area. Broken blend doors and broken blend door actuators are a very common problem among Chevy Tahoe, Suburban, and Silverado models. Typically, to repair a broken blend door, a mechanic will disassemble the dash and replace the plenum box. It is an expensive and labor intensive repair. There are also some DIY solutions such as the heatertreater that provide hardware and instructions for performing the repair by removing the glove box rather than the entire dash. It is worth looking into if you think you have a broken blend door.
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Probably a faulty blend door actuator. Remove the glove box to gain access to the actuator. Replace the actuator with a new one.
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I believe it is located behind the glove compartment. Drop out the glove compartment box and you will see the blend door actuator.
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Remove the dash assembly to gain access to the blend door actuator.
Probibly your blend door motor is stripped out. Remove motor and check door operation manually
Yes, it is possible the blend door is broken in the heat position.