Question about 2005 Pontiac Grand Prix

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How do I replace blower motor resistor on 2005 grand prix

Blower will not turn off even when engine is off and keys out of the ignition.

Posted by Anonymous on


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Posted on Jan 02, 2017

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SOURCE: 2004 Grand Prix blower

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.

Posted on Sep 10, 2008

  • 8 Answers

SOURCE: blower motor only works on high

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

Posted on Dec 30, 2008

  • 104 Answers

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 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

  • 7353 Answers

SOURCE: i changed the blower motor and resistor on my 2005

doesnt work on all speeds? ck the big purple wire at the blower motor, on high speed, it should have battery voltage, if it does, then check the black wire, it should have "0" volts (or ground it, see if it then works). If the purple wire does not have power then fuse #30 (30 amp) may be bad.If the black wire has more than "0" volts then the ground may be bad or the "blower motor control processor" =( resistor) is bad, or the ground for it is bad. the ground wire ends up at the cross beam behind radio. If you ground the black wire at the resistor, and it works, then you have a bad ground at the wire, behind the radio. Good Luck.

Posted on Sep 29, 2009

  • 749 Answers

SOURCE: 2001 Grand Prix: Is the blower motor resistor on a Pontiac 2001 Gra...

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

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Dec 13, 2010 | 2001 Pontiac Grand Prix

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Yes the problem is the blower motor resistor.This will make the fan run even if the key is off at times.Make sure and check the connector when replacing the resistor,sometimes they get hot and will melt the ends.Hope this helps.Good luck.

Apr 21, 2010 | 2005 Pontiac Grand Prix

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2004 Grand Prix blower

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.

Sep 06, 2008 | 2004 Pontiac Grand Prix

2 Answers

2005 Grand Prix GT

There is a heater resistor module, it is located on the passenger side under the dash by the blower motor. It is a bit tricky to get to but isnt to hard to replace. I just dealt with this issue in May. The unit cost me about 86 dollars from the dealer. But be careful becuase normally the resistor goes due to a short in another component in the syste, so this may not be the complete fix for you. My main culprit ended up being the blower motor.

Good Luck

Jul 01, 2008 | 2005 Pontiac Grand Prix

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