The driver's side heater box had disintegrated, and I had tore out most of it some time back; what was remaining was the rearward-most part, with the flaps, and the squarish end plate that is bolted onto the inside of the engine compartment. One of those bolts was being difficult and I feared stripping it. Fortunately, with sufficient application of penetrant (both on the outside, and from within, once I began poking about a bit), I was able to get this bolt loose.
Said plate was held on with three small bolts that were driven in from above, and one longer bolt that goes in on the underside of the dash. On the driver's side, this bolt also holds on this foot-switch (not 100% sure what this switch does as yet). The presence of the switch meant a socket was out of the question - it took a few minutes working at this bolt with a crescent wrench to get it out.
In the above photo, you can also see a piece at the top right - this is a flap that closes over the vent hole where the heater box attaches (via the plate just removed). Each side has a pair of Phillips screws that came out reasonably easily.
Passenger side flap.
Flaps removed. Note that the flap on the left has a spring piece across the top - I'm pretty sure I found the other clip months ago, just laying around - once I get a bit more organized, I'll be doing a hunt for it in the mess-o-stuff that has been building up.
Now to remove the ventilator flap control hardware. Three cables with housing enter through the rear of that area, and the cables are attached to each lever. The whole lever assembly is held on by a pair of 7mm bolts that thread through removable clips. Fortunately, they're removable - the pair on the passenger side snapped off in mid-removal! But since I was able to remove the clips (with the aid of my ever-helpful neighbor Frank), I should be able to get the remnants of the bolts out at some point.
Each cable's housing is held in place with clips. The cable ends are easily freed, but freeing the housing from these clips is a bit more work. These clips are more easily seen above.
Lever assemblies removed. Into yet another baggie with them!
Now to remove the cables themselves. Each side has a circular rubber piece with three holes in a triangle that the housings pass through. Here's a shot from inside...
...and a shot from outside. The cable housings just slide right on out from this end. The rubber piece comes out fairly easily as well. The rubber seems to be in decent enough shape, so I'm hoping it doesn't require replacing. It's an odd piece to be sure.
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