Well i've been posting a bunch here, but even if I get a little input it'll be helpful. Anyways putting somethings back together today, I noticed my A/C & Heating controls won't switch between different outputs and is stuck on defrost putting out hot air regardless of what I set. It's the manual/analog version not the digital/automatic one in some...

 

This can be a pain, just so you know. Two problem areas are the main vaccum line going thrugh the firewall or the plug that connects the panel to the air cylinoid bank behind the heater box. If the buttons are lighting up then I would say that you have a problem with vaccum going to the accuators and that it is stuck in one setting. I had a 280ZX one time that the heater would not work, and right before I sold it I heard an air-leak inside the car. Under the passenger side was the main air line hanging broken in two, so I hope this will get you on the right track.

 

Thanks, I'll check the vaccum lines and see if it helps, i know they kinda do that stuff but wasnt sure and all. but i'll check it out now.