The heater blower motor is located undr the glovebox there are 3 small bolts holding it in place, 7/32 socket i believe after loosening these you will most likely have to move the wirring harness that goes through the floor to get the motor to drop down. after the you get the motor to drop down there is a large vaccum line that goes into the side of the motor gently pull this out be careful not to pull the other end of the vaccum line loose from inside the car. the is a power plug in the side of the motor that u will need to unplug to free up the blower. because it is hard to see the power plug needs to be pressed down on the top and pulled simaltaniously.
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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.
It is located under the passenger side dash behind the glove box. You'll have to lay on your back in the floor board just to see it. unplug the the connector, then remove the 3 screws from around the motor. You'll need to push the bundle of wires that run across it to the side and almost force it out from there. good luck, you almost need three hands
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.
When the blower motor resistor goes it will still usually work on the high setting because that bypasses the resistor. First look on the passenger side below the glove box you will see 3 press-pins. You need to remove the 3 press-pins and the panel they are holding up. Now you will se a bracket holding a bundle of wires and 2 vaccum hoses on the left side of the blower motor see pic. This is held on with 2 screws. Remove the screws and let the bracket hang off to the side. Now remove the blower motor there are 3 screws to remove the blower motor a plug-in and a black hose. The black hose and plug-in you can not see from this side. You will kinda have to angle the blower motor and push the wire bundle out of the way to remove the blower motor. Now with the blower out of the way remove the closest screw from the blower motor resistor. Disconnect the plug in from the resistor and carefully slide the assembly to wads you and it should pop down. There are a total of three screws that hold the resistor in but you only have to remove the one. Now just reassemble the way you took everything apart. Hope this helps. I think the resistor is only like $20.00 at Auto Zone or Parts Source, they also have step by step instruction to. Good luck
I don't claim to know why the lights are affected but when a heater blower only works on the fastest setting, it is normally due to the failure of a stepped series resistor which has taps to set the different speeds.
As emissionwiz stated, that is the most common cause.
This resistor may be mounted on the firewall under the hood or near the blower motor.
Without an electrical diagram at hand, I can't say for sure but there may be a relay failed that bypasses the resistor completely when set on the highest speed or diverts the current through the resistor.