OK, last post for tonight. This is where I really let my geek flag fly.
As I said, I wanted to make this as unobtrusive as possible, which meant not having a bunch of ugly aftermarket looking switches and knobs all over my nicely restored center console. The Gen II system has 4 different controls:
- Heat up / down (controls the electric heater valve)
- Cool up / down (thermostat to control the A/C compressor)
- Mode (Defrost, vent, bi-level, heat)
- Fan (Off, medium, low, high)
I'm more or less stuck with the A/C switch, since there's a metal tube attached that goes down inside the evaporator box to read the temperature. But for the other 3 I was able to adapt stock Alfa parts to the Vintage Air controls.
For the fan speed I used a 2 position Alfa fan switch and just skipped the "Medium" setting so it goes off / low / high. A few minutes with a multi-meter and the wiring was pretty self-explanatory.
For the mode switch I used a blank (no icon) Alfa 2-position rocker switch. The default (switch off) position on the Vintage Air switch is Bi-level, so that was pretty easy. I then wired "low" to "vent" and "high" to "defrost", then flipped the switch over so that "UP" is defrost, "MIDDLE" is vent, and "DOWN" is bi-level. I'm running the vent hoses to the stock fresh air vents on either side of the car, so if I want floor heat only I just have to close the levers on the stock fresh air vents.
The heater switch is where I got clever. I hacked up a stock Alfa lever assembly to directly control a Vintage Air slide heater switch. Pics are worth a thousand words on this one. At some point I'll fabricate a replacement heater plate, since there's now only one lever rather than two.
Tonight I tested out the wiring and confirmed that the fan and mode switches operate as expected. The heater switch is a bit harder to test but I could hear a click in the heater valve, so I think that's working as well.
1989 Spider driver
1974 Spider restoration project