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Re: 2003 grand prix blower motor
The only thing that is now coming to mind, with that information, is that they may have given you the wrong blower motor resistor (putting too much resistance in the circuit and thus causing the motor to run slower) or the motor itself is going bad (not common in that they go bad that way, they usually just fail) or your ignition switch is getting a lot of carbon build up in it.
GM runs the power through the accessories through the ignition switch and the heavy load causes carbon build up on the switch contacts and can cause issues. Commonly, however, when that happens, there are issues with other accessories such as the radio, Drivers Information Center, etc.
Theres no easy way to test if its the ignition switch or the blower motor itself that I am aware of. So I suppose the next question would be did it have this exact same issue before you replaced the blower motor resistor.
Also, if you like, there is a Grand Prix community online at www.grandprixforums.net that may be able to offer further insight if you want to sign up there and see if you can get further assistance from there.
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if you are asking how to replace the blower motor resistor this is how you replace it on your model car.
1. remove the glove box from the passenger side of the vehicle. 2. locate the resistor it is a small rectangular shapped panel with a connector in the middle 3.disconnect the resistor 4.remove the 2 screws that hold the resistor in place. 5. replace the resistor and install it where you found the old on and fasten the screws back in place. 6. replace all the parts in the reverse order and test the new resistor.
Under the passenger side of the dashboard is a carpeted cover you'll need to remove. Once that's out of the way you'll see the blower motor on the RH side and just to the left of it right next to the frontwall is the blower motor resistor held in by two screws.
Here's a picture of the old design (right) versus the new design (left).
Your blower motor resistor is the problem.
The blower motor resistor is located near the blower motor on the passenger side in the heater case. The resistor is held in by two screws and has one electrical connector that plugs into it. Purchase the resistor and you will know exactly what you are replacing. Good luck
I believe that these are two separate problims. The Heater fan stops working because the blower motor resistor block is bad. This is a common problem on the 03 Grand Prix. You'll need to remove the blower and replace the resistor block. The blower is under the center of the drivers onsole.
assuming you know where your blower motor is you can check the motor for power with the switch on and see if you have battery voltage at the connector. if you do then it is a bad blower motor. Most of the time when a resistor goes out it will work on high only but no other settings. with it not working at all seems to be motor. Hope this is helpful.
Try replacing the blower motor resistor, it has different resistances for each speed. Mounted on the passenger side air duct, it is kind of a ***** to get to but you can see the harness if you invert and shove your head up into the footwell.