2002 pontiac aztecs blower quit working on 1,2,3 setting and 2 mths later blower setting on 4&5 quit working. can anyone help me with this? thank, Sid

Your blower motor resistor module has failed. You can replace it with a little effort. The cost is around $35 to $40.

This is caused by the blower resistor. Under the passenger dash, behind the glove box. Drop the blower motor, 3 screws and 1 electrical plug. Behind that is the blower resistor module. Cost me $31 for a new one and took about 1/2 hour to change.

If the blower motor is bad ,this would happen ,the setting 5 gives it full voltage,but on the lower speeds lower voltage,and if the blower is bad,it will not run.

the blower not working on settings 1-3 is the blower motor resistor. this limits the power provided to the blower motor itself to change the speed. at setting 4 it is getting full power. since it quit on 4 also, i would still say the resistor needs to be replaced first, then see if the blower comes back. you may also need a blower motor. if you have a voltmeter you can just turn the switch to 4 and see if the motor is still getting 12 volts. if it is and doesn't run, it needs a blower motor too. if it's not, then its just the resistor

the firing order is 4 Cylinder 1-3-4-2 6cylider 1-6-5-4-3-2

According to my data base, you have to remove the right side instrument panel lower insulator to access it. I'm not quite sure what that is, but these things are always located in the blower motor box so that the fan blows on them because they get really hot. Hope this helps. If you get the new one first, you will know what you are looking for.

what about the actual control panel, maybe its the switch?

No. Most likely it is the blower module. It is on the passenger's side lower part of the dash panel.

usually a bad blower resistor is at fault...

Check the ground, the resistors are accully resisnting the Negitive Current.