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.