My REAL question is more along the lines of the actual heater operation. 
I understand the 70 series controls the heater by mixing cold and hot air - want it hot inside, move the lever and it closes down the cold air in the mix. Want it cooler, move the lever and it allows more cool outside air into the mix.

Fine - but what about the heater valve?
Some of you may recall I asked about a proper heater valve for the car. Ross correctly indicated that AMC changed from the valve that screwed into the intake to the valve mounted in the hoses, so I bought that later style hose. 
I'm not ready to take the whole car apart and spend a month replacing the heater core yet but DO want to run proper hoses to the right places and go ahead and put the valve in place and make it "heater core ready".

I can't see how the heater valve was controlled - it's vacuum - but the car has no vacuum controls that I can find..

I went through every paragraph on every page in the "weather eye" part of the TSM - I even looked in the non-70 series areas for clues.
So it uses a vacuum controlled heater valve - fine, great - but what's it hooked to for vacuum??
The levers in the dash only have CABLES. 
Does anyone have a picture of the correct heater hose and valve arrangement, and info on what controls the heater valve?
I can't believe they'd even have a valve in there if there wasn't any means to turn it on and off -there's no vacuum going into the car at all, none, not a single hose. If there's no vacuum going into the car, and there's no hose coming out of the car for a heater valve, well - what the heck MORE is this car missing?
Geesh, hide the air vent cable and control, bypass the busted up heater core, no vacuum lines into the cabin none coming out, and the TSM shows NOTHING other than the air mix doors and cables!!

So need to know what controlled the heater valve - where did the vacuum that goes to the valve come from - is there some sort of vacuum control somewhere in the car, where and what does it look like?
Non-AC cars are likely to be a bit different.
I also have a center section I bought that has the weather eye controls and there's nothing there at all that would or could go to anything to control vacuum - there are only two cables and those go to "doors" or similar - I think........

So I need photos of where a heater valve is installed the hose routing, and where the heater valve CONTROL is that manages the vacuum. 

I can run vacuum lines - I need to know where the control is, what it is, what it looks like, etc.

Ironic as I want to eventually put AC in this car!

Anyway - thanks as that gives me an idea where to look...... and I'm trying to decide just how far to go with this round of work on the car. Almost all of the dash parts need replacement, the right kick panel is busted up, HUGE screws were run through the trim and into the dash structure meaning I can't put the correct smaller screws in place because the screws the PO put in are likely #10 or 12 (not far from quarter inch)
So I have to remove enough parts to close up the holes in the dash structure so I can mount the trim properly, find a replacement right kick panel, replace the center "pod" as the top is busted out where a light would have gone (or a delete plate, whatever) - there's so much broken and so many huge wrong screws, the heater core is busted, my wife wants heat in the car.......... so not sure where to stop!
The cluster is out and ready to go back in - but I don't have a radio so do I put it back together for a while then take it apart again to put in a heater core and radio?
I figured while I was this far I should at least find out how the vacuum system works and put that part of it back together so when I do the core and radio, that's all I will need to do. 

First the PO removed the defrost "valve" control cable. I was going over the TSM over and over and over and was wondering how do they do this with two cables, and the heat lever doing nothing when moved from heat to defrost - nothing moved or changed.

Then I looked at a center section I got for parts a while back, it still had the heater control panel in it, and I found there were patterns in the dust where there had been a THIRD cable - a cable my car lacks.

I have the temp control or air blend cable and that worked, then there was another shorter cable and that worked, but where the TSM said there was a defrost door - there was nothing. Well, the door was there but no cable.

So I am missing a cable to operate the defrost portion.

Bloody heck - I had bought a right side air vent cable from Eddie a year or so ago and can't find it either - my cable that was tucked up under the dash was broken.... I bet I find it some day (I hope) with the NOS tach I can't find!!

Anyway, I have come to the conclusion that no one could find the vacuum or valve info on these cars because it never existed!

So what do I need for a defrost cable?? What did it look like, how long and what sort of ends? A loop on one end and the offset on the other for the lever?? How long was it?

Thanks for confirming what I was finding out this afternoon, mopar_guy...........
The valve is needed for AC cars because the air flows through the same areas for AC as it does heat - so they had to shut the coolant off on those cars, but stopped only the air flow on non-AC cars. Makes sense. (and was cheaper!!)

Anyway, whoever can comment - that stuff shouldn't be between the heater box and firewall, is that correct?

You can see where this slipped down and the PO bolted the heater box up against it - doesn't see right to have that in some spots and not others - that may be why it smelled like engine in the car.

Well, it won't rust bad or quickly now - and it really doesn't take THAT much more than powder coating or painting and letting it dry a few hours before using it..........

You saw mine? there's no way it could be all the way around the opening - I must have some missing.

Great........ now something more to find or figure out!!!

Was it a molded hose between rear of intake and the heater core? That would be a sharp bend for the short hose from manifold fitting to heater core unless the hose had a molded 90 degree bend near the core end.

I got the heater core installed in the box, foam insulation adhered in spots I thought it belonged and the heater box in the car. I actually installed the bolt in the far right end - the bracket that went to the body.

When I pulled tings apart originally there was no bolt or screw there, not sure there ever was one, but it needs it as otherwise the box hung so far down below the cowl area there was a huge gap. Now with some foam there and the box pushed up and a screw put into that bracket to the car, it sits up higher and the foam for the most part closes off that gap between heater box and the air intake area.
It was a mess inside - pine needles, dirt, yuk.