I had an alarming insight into how the Piper Autocontrol III autopilot works on a recent flight converting over to an Arrow. While approaching base I needed to make a slight descending right turn to point in the right direction for down wind, forgetting the autopilot was engaged - I instantly thought the yoke was jammed!
Asking my instructor if it was normal for the controls to feel so heavy, he simply replied "yes, when the autopilot is turned on". The manual says it can be over powered if needed but I'm slightly skeptical over that one!