I've searched alot of threads and can't find an answer. After warming up, the air coming out of the vents will turn cold. Playing with the control **** sometimes gets warm air back, but not hot air . It does better if I don't turn it all the way hot. I have a 2012 XLT. I went to autozone, the guy tells me there's an inlet and an outlet actuator to the blend box. Sounds like I need the inlet. Is this the one behind the radio ? I can't find a diagram for the air flow . Any help is appreciated .