I really don't know exactly how this very primitive-looking A/C unit worked, or IF it worked for that matter, but it had to go. The only real convenience it offered was a relay switch near the steering wheel (for powering it on and off). The downside is that it's 30 years old and doesn't really do anything. Admittedly the fan does work, but I'm not sure it pumps out cold air. Additionally, and because it's been half-assedly connected to the front alternator, it's a huge drain on the electrical system.
 A photo of the old A/C.
This old A/C consists of 2 condenser units connected to sewer-grade PVC pipes. Each unit has a Freon tube that pumps into it and small fans that push the air out into the PVC. The PVC is then routed into a tube that runs the length of the bus and evidently is supposed to push the air. Presumably the air towards the back would be much stronger than the front, but I never really tested it that thoroughly.
 The Freon tubes connected to the unit.
I wasn't really sure how to deal with these things. I tried unhinging them, but they had just been set for too long and wouldn't budge. Finally I just wound up cutting through the lines. I was terrified for a second as a pressurized gas leaked out, but it was just for a second and whatever pressure was left was entirely drained.
 The wiring harness of one of the units.
I also had to go in and cut and cap all of the wires. I figured that they're on a relay from the front, so may as well keep them until I am certain they're not useful. I also kept the condenser tubes in place so that I have the ability to hook them up to a new A/C unit.
And finally a last look:
 MUCH cleaner looking without that old A/C unit in the back. It's a little harder to see, but we also finished removing and wire-capping all of the light boxes that had been on the ceiling.
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