Geez, another case of the folly of making something more complicated than it need be. I'm reminded of the famous case of NASA spending countless dollars and time developing a pen that would write in zero gravity, while, the Russians, used a pencil...

I'm becoming resolved to the notion that my defrost only system may have to suffice. We live in a cool place anyway, and can't imagine using AC but for a few days a year. At least the defrost does blow through the side panel vents. So my feet stay cold a little longer, oh well.

I think I'll troubleshoot all the simple and obvious stuff, and then call the Indy who worked on it last to see if they will check their recent work for free, and then maybe chalk it up to a 30 year old car with a silly system that isn't worth fixing...

Hey "anarchy", did you replace your voodoo board with the $600 unit mentioned here?

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Where there's a will there's a way
1978 300D