Love of a Mode Door Actuator (Climate Control Solutions) (Page 2/2) Duck 1 JUL 28, 06:42 AM The one I am talking about is where the blend door actuator is located. This is a very light weight spring that goes from the top of the flapper door pivot shaft area .It is not attached to thge arm that goes to the motor. It is totally independent of the actuator motor. It hangs down and attaches someplace else, where does the other end attach to ?