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
The Blower Motor Resistor Pack is defective. Replace it.
Replace the fan blower resister
the blower switch itself is located in the instrument panel. it adjust the speed of the blower. the blower resistor, if that is what you are looking for,is located beside the blower motor under the pass. side of the dash
in side the fan blower under glove department on passenger
Defective blower motor resistor pack.
The Blower motor should be under the dash on the passenger side. It is easily accessible and can be removed by taking out the three screws and wire harness.
Please email me a photo of where the blower motor resistor is and how to change it. Thanks, Michael. By the way I want it for a 2000 Sunfire not a Grand Am.
The blower motor, or blower motor relay is probably out.
Dash ground is loose.
Your wiring is probably messed up, happened to me. Locate the wires from the blower to the controls check them and replace as needed. Assuming no wiring problem check and replace the blower motor resistor.
Had same problem in 2002 Pontiac Gran Prix. The blower motor has two parts, one for settings 1-4 and one for setting 5. This was a sensor problem, not a fuse problem. Dealer service writer was familiar with problem. Repair about $110. at dealership
Main ground for dash is loose.