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Are you still needing assistance? If so, what engine temps are you showing when you are still blowing cold air? Are the heater hoses warm to the touch? If they are warm, the nthe thermostat is good. You want the heat on both side of the heater core from both heater hoses. If they are both cool, then the thermostat is sticking and not allowing the heat through. If one side is cool, there is a blockage in teh heater core the needs to be flushed out.
Now if noth are warm to the touch, then next is to see if the damper is changing. When you go through your settings, see if they are changing by the sound and the feel of the air. More them likely in this case if the heater hoses are both warm, the damper is jammed or not working and the little motor needs to be replaced in the air box.
This truck has no valves on it that shut the hot coolant off from the heater core. Some older ones do in the heater control, but this year doesn't have that.
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