Replacing the Climate Control Unit

I'm trying to replace the climate control unit on my 2000 tacoma sr5. The hot/cold knob won't turn, even though I confirmed that the pull wire behind the unit can move. I decided to replace the climate control unit.

I can take the dash apart thanks to other threads on this forum, but once I get to the back of the climate control unit, I can't get the pull wire off the unit. The wire is hooked into the hole on the circular plastic part on the unit that should pull the wire. Does anyone know the correct way to disconnect the pull wire?

 

Try to see if these help?

 

Those instructions are exactly what I needed. Thanks a lot!