Question about 2004 Pontiac Grand Prix
Posted on Jan 29, 2019
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Posted on Jan 02, 2017
SOURCE: 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.
Posted on Aug 05, 2008
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
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
Sounds like the temperature blend door actuator may be bad or the vacuum hose to it is disconnected.
Poor Heater System Performance CAUTION
Check all fluid levels and adjust as needed, before operating vehicle for extended periods at idle.
Posted on Nov 19, 2010
This is a short with a sensor called the heat sync this occurs when the weather stripping on the outside of the passenger side of the windshield gets warped and lets water in. That water builds up and blows this sensor and the blower resistor resulting in the blower relay to stay in the on position. Replacement of the resistor is needed. Replacingthe blower motor is recommended but may not be necessary depending on the condition.
Posted on Apr 14, 2011
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