check the blower motor resistor
By checking fuel injector or the spark plug I had the same misfire on my 2001 alero and now it works grrat.
it needs a blower motor resistor to make the fan settings work.If you replace the Blower MOTOR Resistor it should resolve the problem.
If you are saying the Blower Motor only works on high, then your problem is a defective Blower Motor Resistor Pack. Replace it.
The Blower Motor Resistor Pack is defective. Replace it.
the resistor has melted the variable settings. Replace resistor under passenger dash.
If you mean the fan works on high only it's the blower motor resistor.
Does your blower work on ANY settings? If it works in the HIGH setting only it's a good chance that the ressistor is bad. Don't worry they are easy to replace and fairly inexpensive.
the resistor for the blower motor is busted blower works on high with out it
If the heater fan works on all speeds, then the blower motor, blower fuse, blower relay, and blower motor resistor pack are all good. If the fan runs but nothing comes out of the vents, you have a 'mode door' issue (which might include a bad control head).
If the fan works on at least one of the settings then it most likely the resistor pack. The fan either works or doesn't work.
My first guess would be the blower motor speed resister. The second guess would be the switch and/or switch plug. I agree, It's a very common problem, the resistor goes for about $52.00 Can. Carquest has them part # RU44
I was just told by an auto repair man that my 2002 olds alero's power steering fluid can only be accessed and therefor filled by the dealer because of a special tool needed to open the compartment. Diffrent answer: i just filled my wifes 02 alero with standard steering fluid and it works fine. nothing blew up.