Question about Pontiac Cars & Trucks
Resistor gives you the fan speeds
if you by pass the blower will be full blast all the time
you need to find the 12 volt and earth for the motor to by pass
Posted on Dec 09, 2016
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Posted on Jan 02, 2017
SOURCE: Blower motor not working
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.
Posted on Jul 28, 2008
SOURCE: 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.
Posted on Feb 03, 2009
It is behind and underneath the glove box back by the firewall. No need to pull out the glovebox.You may need to pull the carpet back to get to one of the bolts.
Posted on May 18, 2010
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).
Posted on May 31, 2010
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