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does the hot/cold control knob feel like it is moving something or is it very hard/easy to turn ? sounds as if the hot/cold setting is stuck at hot would need to strip back heater control panel and follow the control wire/cable to the heater box where a flap opens and shuts for hot or cold air and see what is happening ,cable may have broken , flap may have come off it's hinge won't know until you get a look at it , the engine isn't over heating is it ?
There are only 2 reasons for a problem like yours. Either the water is not going through the heater core or the ductwork under the dash has a problem. For checking the water flow, warm the truck up and then feel both water hoses connected to the heater core. They should both be hot if the water is flowing. If they are both as warm, then the problem is inside the cabin under the dash. If they are not equally warm, there is a problem with water flow.
Tip- For a time the manual heat control models(Not electronic) used a heater knob which could break on the backside of the knob. When it does this, the heater control shaft will not turn as the knob is just spinning in place. Gently pry the knob off and then twist the control shaft to see if it will now work.
You have a broken wire connection between the temperature control knob and the circuit board behind the center dash console. Vibration causes the failure and once the control knob gets loose the solder connection fails.
For someone that knows how to remove the dash unit and can re-solder a couple of new wires this fix should take no more than 1 hour. Make sure that you apply loctite to the heat control knob spindle nut when you re-assemble it.
The dealer quoted me 750 dollars to fix this issue and I found out that it's a common failure for this year. I fixed mine virtually for free but it took some tools and about an hour of my time.
make sure the control knob on the dash is on "RR". This lets the driver control all the vents in the back. The heat only comes out of the floor vents, if you have the knob on the blue dots that represents the air conditioning in which the cool air will come out of the vents up above in the back. There is also an area on the control knob on the dash where you can turn the knob to shut the heat and air conditioning off. If the knob is in this position then you can control everything with the knob up above the seat right behind the driver's seat.