It only drains with the key on, and I don't think I have the "evil servo". My fuse diagram doesn't say about the auto climate control. Is the servo also the heater water pump/vacuum pump thing that's just behind the passenger headlight? If so, I have already removed that since it was broken.

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$350 1977 World's Ugliest 300D. Custom built turbo setup, TD04H-13T, eBay external wastegate, fender exit exhaust, mostly gutted interior, b20 biodiesel, many other cheap fun ratrod-ish mods