It will be working with the a/c blowing cold then when I start the truck the next time it won't come on. Have to wait a while before I try it and it works just fine.

 

What are you working on and what type of climate control system is it? Can't see your truck or the system through the Internet.

 

I have a 2012 F150. It is just a standard model with A/C. I go somewhere and the A/C works good. I leave and can't turn on anything (A/C, heater, defroster). I get home and restart the truck and it works just fine. This happened twice today.

 

 

I looked around on the interwebs, and found nothing. Seems like a computer module issue with the climate control.