Suburban Rear Heat & AC removal/installation/compatability

[NCBurb]

Howdy. My 87 Suburban did not come with rear heat or AC, but it does have factory in-dash AC. There's a guy parting one locally that supposedly has both, and I'm going to check it out this week. However, in doing some reading in old threads here, it looks like the rear heat was a completely separate unit from the AC? The AC is an overhead unit, and the heater was a floor-mount? Did some have one and not the other? With both, would there then be 4 lines running front to back? Does the AC tie in up front or is it a completely separate unit?
Other than power wiring and the control switches up front, is everything else pretty obvious as far as what I would need to remove to get everything? Any tricks or should it all bolt out pretty easily?
Lastly the parts rig is an 89, does that make any difference? Anything else to watch out for or is it pretty straightforward? All tips and advice appreciated, thanks...

 

[skysurfer]

My '89 has rear ac only. It seems like the heater units aren't that common, I've only seen pictures of them. Yes, the ac is tied in to the front system. Removing one would be pretty straightforward, the only part that might be tricky is where the rear lines enter the cabin at the back corner. It will look like this but I'm not sure how they come out.

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I think I remember @89Suburban removed his ac from the back, maybe he will have some input when he checks in.

 

[PrairieDrifter]

Those lines from that picture run up the farthest back, passenger side pillar, behind a trim piece. Then up into the ac housing and into a condenser up there.

 

[89Suburban]

here are a few shoddy pics of the rear heater parts:

Random square parts taking up space

Here is some stuff that is taking up space and needs to go. From left to right: New gates 6.2 upper hose w/ less than 100 miles on it Stock wiper arms off of an 84 K5 Engine compartment plastic mount for factory bottle jack Shield for dual tank pump Ashtray Pickup cab corner speaker...

www.gmsquarebody.com