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)
heater core
My dashpanel lights stopped working in your Chevy Monte Carlo ss 2001 what could the problem be
Low coolant? Bad thermostat? Heater control cable not adjusted properly? Heater core airbound? Heater core plugged?
One reason a 2004 Monte Carlo heater motor blower may not work is low coolant. You can check the coolant level after the car has been turned off.
Heater temperature control valve.
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Check coolant level? Heater core plugged restricted, or airbound? Defective thermostat? Water pump not circulating coolant? Heater control cable not adjusted properly?
Under the dash
There are several reasons. The most common is the blower motor resistor. This can be found in the passenger's foot area. It is mounted in the heater box, and has one electrical connector. The second most common cause is the blower motor itself failed. The third most common cause is the heater control unit in the dashboard ( the thing with the knobs you turn). This is all assuming that you have checked the fuses which are located in the interior fuse panel.
On the passenger side on the firewall.