My vents work on 2 positions. Off or blow you away

I dont know what is wrong with it, do I need a new logicon?

 

I'm pretty sure that's the logicon at fault, and i think it's the air mix motor if it won't move to other positions. I've got a working logicon from an '86 if ya need one. But be sure to check yours before replacing it, it could possibly be something else.

 

air mix motor will only control the temp...

But yeah it sounds like a bad logicon.