Not sure but I have a similar noise with my all-wheel drive that changes depending on whether I'm accelerating or not. Mine does occur at higher speeds. Best I can tell it's the slip joint for the front drive shaft which causes a roar type noise that can be felt. It's my understanding you can...
sounds like blend door. try making a hard right or left and see if you notice it changing from hot to cold. Noticed this before I knew about the blend door issue. If the temp gauge is up where it belongs that is. I have same year truck.
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