climate control question

SO I have been searching and have not found a thing. When I turn my hot/cold knob it still blows hot. I have checked where the cable attaches to the blend door and it all works, also shuts the valve on the heater line, I was wondering if anyone had any advice. Also I was thinking about just getting rid of all the cables and doing electric motors like on newer cars. Is that even possible and how hard would it be?!?

have you checked to make sure that the heater valve is still working internally it is possible that the valve might have broken on the inside.

Ill check that tonight. One thing i have noticed is that the plastic piece that connects the cable from the knob to the blend door on the bottom of the ac box dosent open or close all the way. When i turn all the way to hot i can pull it just a lil bit more and hear the door close. I tried another one and its still doing the same thing. Dont know if theres a trick to fix that or not.