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Originally Posted by Stephanie G.
I have a 99 Alero. The first two settings (low and medium) on my heat/AC fan doesn't work. If you turn the knob to the 3rd setting it's blowing on high. From what I heard this is a common problem. Is it the switch that needs replaced? Thanks for any help!!
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Sounds more like a blower motor resistor problem than the switch on the HVAC control. The resistor feeds voltages to the blower motor based on the setting of the fan speed switch.
Its located under the dashboard in the evaporator/blower assembly.