DesZ

Ok I managed to figure out the furthest back towards the firewall (valve on far left in picture above) Vacuum Valve's Hoses. Based on the FSM Vacuum diagram and the info Wade gave me above, the 2-Y (2 yellow stripes goes to the side Vacuum Valve Connector and the Y lone Yellow stripe goes to the bottom vacuum Valve connector on that furthest back bottom Vacuum Valve connector that connected manually to the Air Intake door.

1982 280zx Heaterbox 3 Vacuum Valves. Two Valve connectors on the Rear two. The furthest rear one opens up the air Intake door per FSM HA-5. If I knew which vacuum lines went onto this one I think I'd have my reinstallation licked!

Incredible help your giving me Wade. Thank you!!! Thanks to your help I found the 6 port vacuum Selector still connected below the Heater/AC Control Unit (I never removed it nor the Dashboard). AND I was able to see the Red Striped Vacuum hose (S-Vacuum Source/Primary) which only made sense since the Vacuum hose coming from the engine compartment was bigger then all the other 6. And just the red connector had a white hose to hose jumper/connector. So I connected it and taped it up with red electrical tape so it won't come loose. But check out he next thread I'm starting about the Vacuum Valves and I got some better pictures then you since my Heater box is on the floor in front of me. Happy 4th of July!!!

Wade: thanks for the tips but mine's a Manual not Automatic AC. I think that 8 prong vacuum selector is for automatics as I can't seem to find it? I'll post some pictures tomorrow.

I've have this Heater box I'm trying to reinstall now that I've replace the Water ****. My problem is there are 3 Vacuum valves on the left side of it and I am unsure of what vacuum hoses go to what. I have the FSM-Factory Service Manual and have even printed out the Vacuum lines schematic, but like many others can't make sense of it? The back 2 Vacuum Valves have 2 hose connectors. One on the bottom, which activate the control arms on the other side (and make it operational). The other on the side. Yet I have found no pictures (anywhere online) of what each one of these Vacuum Valves are even called. I have a manual AC and one Vacuum hose coming thru the firewall from the engine compartment. I believe it will connect to the bottom of the Vacuum Valve at the rear of the Heater box. I've already simulated by sucking on a hose connected to it and it seems to open the main door to allow air to pass thru the Heater core. Finally my question: Do I have that right? Appreciate the help. PS: I am going to take some before and after pictures and post them for others future reference.