Blend doors on these things can be a pain. My recirc door has been messed up for a couple of years now. Just haven't taken the time to fix it. Do some googling of gm blend door and see if that leads you to anything.
Sounds like the blend door. Mine gets stuck on hot fairly often but I still have not bothered to fix it because if I shut off the truck and wait long enough, it will eventually move back to cold. If and when it gets permanently stuck, then I will have to fix it.
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