No heat when knob is turned to hot?

Removed blend door actuator and tested. Works in both directions. What I find odd is when I plug in the actuator and turn on key the actuator will respond in both directions. (Actuator not installed just plugged in for observation) but when I turn off ignition actuator will continue to run and will not change direction when I change the heat control. If I unplug the actuator, it will remain off until I turn the ignition back on and will respond to the cold and hot knob by reversing and going forward depending on where the heat control knob is turned. But when I turn off the ignition the actuator will remain running in one direction and will not respond to the heat control knob, only stopping when I unplug the harness.