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Is your truck still under warranty?
The blend door could be stuck
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What hvac set up ? Dual zone ? Electronic controls ? Manual controls ? Column shift ? Or center console ? Was it making any clicking noises before it went out ?
The blend door actuators going bad ( gears inside get stripped ) is a very common problem on these trucks . I replaced mine on my 2011 with only around 40k on the ODO!
A bad day of hunting or fishing is better than a good day at work !