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Remove the dash assembly to gain access to the blend door actuator.
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.
Probably a faulty blend door actuator. Remove the glove box to gain access to the actuator. Replace the actuator with a new one.
You will need to remove the dash assembly to gain access to the blend door actuator. Recomend purchasing a shop manual of you intend on doing that job.
behind the glove box on the left side remove glove box 6 screws disconnect the light
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Unfortunally you need to remove the entire dash assembly in order to gain access the the blend actuator. Consider replacing the heater core while your in there only because the amount of work involved to do it later if it should leak.
The temp blend door actuator is probably at fault.
get a person who does that work to come over
You need to remove the glove box and then you will see the actuator. The glove box has about 6 hexagon screws which are simple to remove. However reaching the actuator is another story. Good Luck!
You have a faulty temperature blend door actuator located directly behind the radio. Remove the radio and remove the blend door actuator held to the heater case with three 8mm screws, and replace it.
It's a temp blend door and actuator, and it is located behind the dash assembly, connected to the HVAC box. The dash assembly needs to come out to access the blend door actuator.