A/C issues
 

Any suggestions are greatly appreciated, it's HOT here in Texas.
I have a 2012 Platinum with the ecoboost. When the truck is running sitting still the A/C system works great blowing cold air. After about three minutes of drive time the A/C begins to blow warm air. Sometimes while still driving it will again blowing cold air again then back to warm air. If the red light is long enough or I pull over, again it will blow cold.
Thanks in advance for any suggestions.

It's too hot to be guessing, take that thing to an A/C pro, probably cheaper in the long run anyway.

I'm not any help, but am curious as to what you find the issue to be. Mine has similar issues ('04 XLT w/58K) but is JUST cold enough to be tolerable. Not only does mine blow colder at idle than under load, it also blows colder on lower blower settings. I threw a thermometer in my vent and on MAX A/C blower 4 I get temps around 70. On MAX and blower on 1 or 2 I can get it down to around 50. The sweet spot for me is MAX on blower speed 3. Not as cold as 1 or 2, but more air flowing makes up the difference.

Maybe the recirculate cabin air door is broken and hung open letting hot air flow in when moving.