I do not work on HVAC systems. Just by looking at the schematics, it
appears that there aren't many choices...either the blower speed switch
or the blower resistor. If I remember, I'll ask the guys at work and see
if one or the other is more common. If you need schematics and you
don't have access to SI, let me know and I'll get what you need. A little
testing and you'd probably figure it out quickly.
Chances are 99.9% it is the blower resistor board. I have replaced half a
dozen in my 50 years of driving. Chevy has the resistor pack at the blower
sticking in the duct. This causes corrosion that eats away the lands on the
board. They also did not coat the surface to prevent corrosion on the one in
my 96 cavalier. Good luck as it is a stand on you head under the dash
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