Had antifreeze leak in my cab so I did the obvious and pulled my dash and replaced the heater core. After I still had no heat. I pulled the blend door actuator and opened it up and found the antifreeze had leaked inside it and corroded everything. I got a new one from orielly's and installed it and it shattered my blend door. Dash back out and new blend door. Now I see that the actuator goes full hot and will not move from this position. I ohmed out the wiring and it is good. I replaced the temp panel and no change. I took the actuator back and got a new one and it still does the same thing. Anyone have any idea?