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Hello and thanks for your question. My name is ***** ***** I will do all I can to help.
If you just sit and let the truck idle and blast the heat on high, will it get cold? or does the heat stay warm?
How does the coolant look in it? Is it nice and green, my first thoughts are the heaters core plugged, pretty common on Fords. Especially if you get one hose hot going into the firewall and one hose is just warm or cold. I suppose one thing to do, is to get it in this "no heat" stage, and then pull over quick as you can and feel both heater hoses going into the firewall. Can you try that and let me know if both of them are the same temp, or if one heater hose is alot hotter than the other one?
No, it wouldn't necessarily be cold all the time if it was plugged, can you check the heater hoses when it acts up and see if one is hot going in and one is cold?
Alright, sounds good. Let me know what you find there.
Alright, Thank you.