Blend door actuator replacement and possible wiring issue?

Only having cold air coming out of the vents in my e250 ford Econoline, previous owner had tried fixing it but ended up cutting a wire which he patched up with a crimp and spare wire. I've replaced the blend door actuator and had no luck (blend door motor didn't even move) so I decided to take apart the old one and fiddle around. Old blend door actuator still moves as when I put it back in after opening it and plugging it in it moves the motor one direction but then stops and doesn't go the other way (Weirdly enough I first noticed it when I had accidently put the motor upside down and when connecting it up again it would do small rotations back and forth in a rocking motion, I think due to being on opposite negative and positive terminals). I can include photos of what I'm talking about and also the cut wire as I removed the previous owner's work to make sure the wires were put back together properly. Any help would be much appreciated as I would love to have heat now it's nearing winter. Thank you.