Ok, I've done some experimenting both on auto and on manual settings.
If you restart the truck after a few hours it takes off on where you left it. Both auto and manual mode.
If you restart the next morning or after several hours, the HVAC is completely off and you have to set it where you want it.
It works fine when in auto or manual mode it's just keeping it in the selected mode if it sets for more than a few hours or overnight.