How to replace a blower motor on a 2003 pontiac bonneville

SOURCE: blower motor only works on high

located under dash next to blower motor itself should be a couple of wires plugged into it

SOURCE: How do I replace a Heater Blower motor in a 2003 Pontiac Vibe?

Remove the Glove box. You will then have access to the Blower unit. There are 3 screws that are holding the blow unit in place. You will need a Phillips screw driver and a 1/4 socket. Once you have located the unit remove the 3 screws and the unit will fall straight down. Unplug the wire harness and then reinsert the new Blower Motor. If you purchase an original GM part this makes life much easier, you just screw the 3 screws back into the holes and then plug the wire harness back in and reinstall the glove box. If you use an aftermaket part you will need to do some wire splicing to make it work but it is a 10 to 20 minute job depending on which part you decide to replace the Blower with.

SOURCE: 2005 Pontiac Bonneville hvac blower does not come on

Start by checking the blower resistor. It should be under the dash on the passenger side near the blower itself. You will need to remove the glove box to access it. It is a small plate that has only a few screws and a group of wires that go to a plug in the center. Unplug it and remove the screws. When you pull it out it should look like a series of small spring shaped coils. Most likely one or two of them will be burned up. Replace it in reverse order and your blower should start working again. If this is not the problem then test the fan motor itself. Hope this helps. Good luck.