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I have a 91 sonoma. The blower motor stopped working, so I replaced it. A week later the new blower motor quit working. I took it out, there is nothing inside the housing. I tested it directly to the battery and nothing would work. So before I replace it for the third time, I wanted to ask to see what could possibly be frying the motor.

All three settings for speed work. The switch for the defroster, AC, dash, blah blah doesn't work. I only have defroster and off. Any ideas for that?

Thanks in advance.
 

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Check your voltage to the blower motor, and yes aftermarket can sometimes be crap.

As far as defrost only, you most likely have a vacuum leak, check all your vacuum lines under hood and under dash/behind the HVAC control head. This is a default safety mode, ensures you can atleast defrost your windshield to see while driving. You could also have other issues, blend door motor etc.... Check all your vacuum lines first.
 
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