71 Dart A/C car heater issues

Here’s the actuator that retracts on its own but has to be manually pulled out. Also, anyone have a diagram on how these heater boxes bolt to car? It ls slightly loose and does not perfectly seat up to the round hole in the cowl. When I manually move the actuator the air seems to be hot. Even though I’m idling in my driveway and it’s 70 degrees out. I’ll try it this week when it’s cold in the mornings