You could check to see if the fan motor is receiving voltage. If so, maybe it needs brushes. (?) If it's not getting voltage, I think there is probably a relay somewhere. You could check to see if that's getting voltage and if so, if it's sending it out the way it is supposed to. But I don't know what pins go where.
Jim
--- In diesel_mercedes@yahoogroups.com, Alan Boucher <alstheone@...> wrote:
>
> It's that time of year again when evil things happen to the hvac
> system.. My 83 SD button box doesn't produce any results. Pushing the
> defrost button at any time doesn't start the blower. I've checked the
> fuses. What is the next rational step in troubleshooting. I have the
> shop manual and wiring diagrams. In the past I've found this group an
> easy alternative to rational thought. I'd appreciate any suggestions to
> make things easier.
>
> Al Boucher
>
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