My blower for AC and heat was only working on one setting. Now is not working at all. Switch or bad blower? Anyone? Where do I start chasing this one?

 

Welcome!


You could start by giving some more specifics as to what kind of vehicle you have, so that would give everyone an idea of what kind of electronics we are troubleshooting here...

 

Sorry, 1979 Olds Cutlass Spreme

 

What setting? The classic symptom of a failed blower motor resistor is that the blower works only on the highest speed setting. If that was your case, I would suggest replacing the blower motor resistor. However, now that the blower doesn't work at all, the resistor is perhaps not the answer. But if the one speed it was working at was the highest speed, you might change the resistor, anyway, and see what happens. If the highest speed was the only one working, the resistor likely needs to be replaced, anyway.