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I've been having problems with 2011 F250 6.7L diesle. The first thing I noticed maybe a couple months ago on a trip to the store (maybe 2.5 miles one way. When I almost got there the heater was blasting out really hot air, hotter than normal. On the way back home there was no heat and only cold air. This happened once more later on.

Then a few weeks ago I went on a 30 mile trip and the truck overheated when I got back to my town. I noticed then that the heat wasn't working then either. Same thing happened on a shorter 7 mile trip a week later. I noticed the heat Guage wasn't pegged all the way in hot, but would fluctuate up and down slightly.

Is this a thermostat issue or something else? I'm not very experienced with working on engines yet...

Thank you!
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