I have an '04 with approx. 79000 miles; the blower is going out on mine too. The motor is probably burned out and you will need to replace it. It's about $90 for the part. Kind of a pain to change; I changed the blower motor on my 97 'prix and I had to lay upside down on the passenger seat and work on it upside down. Other than a little physically uncomforable, not too hard to do.
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Oct 8, 2012 - Uploaded by GPVlog
04-08 Pontiac Grand Prix - Blower Motor Resistor ReplacementPart 1 ..... Loosen, but do not remove the two frontward screws, then remove the single rearward .... Pontiac Grand Prix StereoRemoval 2004-2008 - Duration: 4:27. by Factory Car Stereo ...Pontiac Grand Am ,HVAC, Heater Fan will not turn on.
$24the AC light does not light until you turn the fan on, that is ok, the issue with your fan only working sometimes is more than likely a faulty blower motor, in some cases it is the switch, when the motor does not turn on try tapping it and see if that makes it work, if it does then it is the motor. the switch at autozone is part number SW295 and is $16 the motor at autozone with the blower wheel is part number PM136 cost is $24
check the connection on the heater blower its self, remove the panel under the dash on the passengers side of the car and the heater blower is to the left next to the door it should be fairly easy to reach up and just push on the plug and then check to see if it kicks on bumps can cause wires to get loose over time and more often than not a loose wire can be the cause of alot of grief
Replace the blower resistor that is mounted next to the blower motor on the passenger side of the vehicle.
This will restore correct blower operation and I suspect it is also back-feeding voltage resulting in your electrical issues.
Two screws hold the blower resistor into the heater case and it is very easy to replace.