The lights on my hvac controls in my 2000 sunfire stoped working,so I took it apart and the lights are fine I think it's the wire ,the wire from the lights goes to the rear defrost control. Since we have a few parts cars I decided to replace the controls I unpluged every thing but I don't know how to disconnect the tempature control cable. It looks like the tempature control will unscrew from the rest. Do I have to unscrew it or is ther a way of disconnecting the cable