Question about 2001 Oldsmobile Alero

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Heater/ac blower my heater/ac blower used to work only on the two highest settings. now it doesn't work at all

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  • jbx23 Feb 21, 2009

    Check the connection under the glove compartment on the passengers side. If the passenger extends their leg they could probably hit the wire that controls it and not make a good connection. I've had the same problem and it's fixed it every time. I think it's a blue and black twisting wire.

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Usually when the blower loses speeds over time the problem is the blower motor sensor.luckily these are relatively cheap.

Posted on Nov 13, 2008

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1 Answer

2005, Grand marquis, aircondition works on max or regular AC setting, but fan only works on the highest setting, will not work on slower fan speeds


this is a smiple repair, replace the blower motor resistor, this is what controls the lower speeds and is very common,the resistor is locate in the heater box next to the blower motor.

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My fan heater only works on the highest setting 6


Hi. This will be the result of a failed resistor switch. the switch controls the current level sent to the blower motor. Once replaced, the motor will operate at your desired rate. This switch is an integrated part of the AC/Heater control cluster, that is mounted in your dash. You will need to remove the trim, and cluster assembly to expose the damaged switch.

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Sounds like the blower resistor module needs to be replaced. Could also be the switch.

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Sounds like the blower motor resister is bad, it regulates the speeds of the blower motor, it should be located somewear around the blower motor, 2 screws hold it in the heater box and it has a electrical plug to it.

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Subject: 2004 isuzu rodeo...my ac/heater blower is not working


The resistors are in circuit only on the lower fan speed settings.
On the highest speed setting, power is switched directly to the fan motor.
Check fan power supply fuses,
Check power is available to the fan when high speed selected.
If all above OK, apply power directly to the motor to verify fan motor runs- if it doesn't the motor may need replacement/repair.

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1 Answer

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it could be that fan rester went out. pick up a repair manual from Napa. look to see if you need to take the dashbord out. some of this are lockated betewn the fire wall and the blower moter housing. i have had a hard time looking for on on the internet.

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if the blower works on high then its not a fuse it could be the switch or the resistor that cuts back power for the lower settings

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1 Answer

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this is caused by the blower motor speed control resistor being defective, this part is located near the blower motor.

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