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Normally this is one of 2 things. Either the speed control switch is bad or the Blower Motor Resistor Pack is bad. My opinion would be the latter. Additional Answer: Same Issue:However, Speed 1 & 2 are not working on mine. Replace the entire A/C dashboard Controler. Heat & Air Conditioning: Heater & AC Controls :: ACDELCO Part# 1472736 (Control,HTR & A/C 2 Doors; w/A/C FRT MAN/AUX Control)

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Q: How do you fix a AC and heater fan speed control knob on a 2002 Monte Carlo that has stopped working on speed 1?
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