Question about 2004 Chevrolet TrailBlazer

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Blower motor only works on one speed - 2004 Chevrolet TrailBlazer

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Solutions 3 & 4 are correct. It is a blower resistor. It is located somewhere on the fan housing, probably.

Posted on Jun 20, 2009

  • kfbarrand Jun 20, 2009

    Correction! Disregard solution numbers. Just change the resistor.

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HI, this is a resistor switch issue. you will need to replace the actual switch that is located on the instrument cluster on the dash. it has failed.

Posted on Jun 19, 2009

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If it is a mechanical switch (a knob you turn or handle you slide across) then your resistor board is damaged (assuming you can turn the blower motor off fine) there is a board with a few resistors on it which controls the speed of the blower motor.

Posted on Jun 19, 2009

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Replace the blower motor resistor.

Posted on Jun 19, 2009

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If it only works on high, replace blower motor resistor.

Posted on Jun 19, 2009

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Posted on Jan 02, 2017

jayhawke
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SOURCE: blower moter works on hi

sounds like diode in motor burned out- replace motor

Posted on May 18, 2011

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SOURCE: Low speed ac blower motor does not work. Other

The heater blower motor has a blower resister. its in the heater box next to the blower motor, above the passengers feet. The bottom of the dash has a cover hold on with a few screws. the resister has a 4 or 5 wire plug and is heald in with 2 bolts, remove the connector then the bolts and it'll slide out. The new one may have to come from the dealer and have your VIN ready when you call. They'll have it or can get it in one regular day

Posted on Aug 29, 2009

  • 534 Answers

SOURCE: heat/ac blower motor works on high. intermittent on other speeds.

Check the blower resistor pack - usually located in the heater air ducting in the blower fan airflow. Check for loose connections and open circuit resistors on the unit.
If speed 4 works always, its unlikely to be the blower motor ground connection.

Posted on Aug 11, 2009

  • 3 Answers

SOURCE: blower motor wont work on any speed

check the AC/Heater fuse

Posted on Aug 20, 2009

ministock48
  • 258 Answers

SOURCE: 1996 GMC blower motor only works on high speed.

more than likely yes the resistor

Posted on Oct 22, 2009

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Blower fan not working at all 2004 Buick rendezvous


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If automatic it's probably the blower motor control processor .
Blower Motor Control Processor The blower motor control processor is an interface between the HVAC control module and the blower motor. The blower motor speed control, Blower motor speed signal, battery positive voltage and ground circuits enable the control processor to operate. The HVAC control module sends the commanded blower motor speed to the control processor through a 0 to 12-volt linear ramped blower motor speed control circuit. As the blower motor speed control voltage increases, the blower motor speed increases. The control processor sends the actual blower speed to the control module through a 0 to 12-volt blower motor speed signal circuit. The processor supplies 12volts to the blower motor through the blower motor voltage supply circuit. The control processor uses the blower motor ground as a low side control to adjust the blower motor speed.

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Blower Motor Control Processor The blower motor control processor is an interface between the HVAC control module and the blower motor. The blower motor speed control, battery positive and ground circuits enable the control processor to operate. The HVAC control module provides a pulse width modulation (PWM) signal to the blower motor speed control processor in order to command the blower motor speed. The processor supplies 12 volts to the blower motor through the blower motor voltage supply circuit. The control processor uses the blower motor ground or low reference as a low side control to adjust the blower motor speed.

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Its faulty blower motor resistor. The low and medium speed on blower motor is controlled by resistor and its actual speed is high. So because resistor is not working, blower motors actual speed which is high is working.


It can be faulty blower motor or faulty blower motor resistor. Get the blower motor inspected. If it's faulty it has to be replaced.


=======

For blower motor testing and replacing, check the link below: ----

Blower motor Testing/replacing for all vehicles?

http://repairhelpcenter.blogspot.in/2012/02/blower-motor-replacing-for-all-vehicles.html

------------

These will help.

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Sorry its blower



Its faulty blower motor resistor. The low and medium speed on blower motor is controlled by resistor and its actual speed is high. So because resistor is not working, blower motors actual speed which is high is working.


It can be faulty blower motor or faulty blower motor resistor. Get the blower motor inspected. If it's faulty it has to be replaced.


=======

For blower motor testing and replacing, check the link below: ----

Blower motor Testing/replacing for all vehicles?

http://repairhelpcenter.blogspot.in/2012/02/blower-motor-replacing-for-all-vehicles.html

------------

These will help.

Thanks.

Dec 07, 2012 | 2006 Kia Sportage

1 Answer

Heater is not working


HEATER BLOWER MOTOR


Its faulty blower motor resistor. The low and medium speed on blower motor is controlled by resistor and its actual speed is high. So because resistor is not working, blower motors actual speed which is high is working.


It can be faulty blower motor or faulty blower motor resistor. Get the blower motor inspected. If it's faulty it has to be replaced.


=======

For blower motor testing and replacing, check the link below: ----

Blower motor Testing/replacing for all vehicles?

http://repairhelpcenter.blogspot.in/2012/02/blower-motor-replacing-for-all-vehicles.html

------------

These will help.

Thanks.

Nov 28, 2012 | 1988 Honda Accord 4 Door

2 Answers

My blower motor only works on 1 & 2 & 3 speeds dont work on 4 & 5. I was told to buy a blower motor. Need to know where this is located to replace on my 2005 Chevrolet Trailblazer


If your blower works at some speeds and not others, the likelihood of the blower motor needing to be replaced is low. The more common problems would be either the switch or the resister that regulates the motor speed. The resistor is usually located in the air duct under the dash.

Jun 17, 2011 | 2005 Chevrolet TrailBlazer

1 Answer

My blower only will go on high and now its not working? but now its not working whats wrong i have no defrost or anything


Usually if your blower motor will work on high but not any of the other speeds then the blower motor speed resistor is at most likely fault. If the blower will no longer work at all you still may have a bad speed resistor but may also have a bad or corroded connector at the speed resistor or blower motor control switch, or even a blower motor that has finally failed. A blower motor that is pulling too many amps can damage the speed resistor, connector, and switch so I often also replace the blower motor whenever I find any of these other problems. Hope this helps and good luck!

Mar 29, 2011 | 1998 Plymouth Breeze

1 Answer

2001 dodge caravan Ac comes on but will not blow ay any speed . I replaced blower motor resistor.


try tapping the bottom of the blower motor with the blower motor speed selector turned to high and the key on. If the blower motor starts working replace it.

Another thing you can try is unplugging the blower motor and supplying your own power and ground wires to the blower motor. It doesn't matter what pin on the blower motor you supply power or ground. It will work either way. If it doesn't than replace the blower motor. If it does you might have a bad control head.

You could also have a bad blower motor relay or blower motor fuse located in the underhood fuse block. There should be power at the dark blue wire at the blower motor with the key on and the fan speed set to any position.

here's a how to article I did on blower motor operation.

blower motor does not work

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1 Answer

Heat/ac blower motor works on high. intermittent on other speeds.


Check the blower resistor pack - usually located in the heater air ducting in the blower fan airflow. Check for loose connections and open circuit resistors on the unit.
If speed 4 works always, its unlikely to be the blower motor ground connection.

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