I have a 1980 Audi 5000, I think the electronics are about the same as a Quantum of the same era. Lately the blower fan only works when it feels like it, usually after the car has ben running about a half hour or so. I checked the fuses and the relays in the fuse box, nothing wrong in there. Are there more relays for the blower fan under the steering wheel? I also tried to run a hot wire directly to the fan, but that didn't work either. Does anyone know the way to manually wire the fan so it will always be running when the engine is started?