09 Dodge Ram AC problem

My blend doors are not working I know that but
now when my AC works it's really weak and not
that cold. I'm guessing that is because of the blend
doors not working. But the real problem is the only
way to get my ac to actually work is to unplug the
plug behind the dash board. The way I know I need
to take the dashboard off and unplug it is the lights
on the ac controls will not go on and max ac will not
light up. But if I take the dashboard off unplug one
plug that goes right behind the controls. I can start
up my truck and the the lights come on and the ac
will work. Two three days later I will have to do it
again. Any ideas???