Question about 2005 Chevrolet Trailblazer Ext

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I am having a problem with my blower motor I have 12v at the plug but motor dosent run but i hook the motor to the battey the motor runs

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Trailblazers have a history of bad blower motor resistors. easy to replace. Located under the glove box

Posted on Jul 11, 2010

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I bought a basket case 95 Iszu pickup, my last issue is the blower motor will not run from the heater switch. The previous owner has run a direct wire from an unkown power source and added a toggle...


Usually, the 12V runs to a resistor pack mounted to the side of the blower motor. When you use the fan select switch, you change the load on the motor and it goes faster or slower. If the resistor pack is defective, that will cause the motor not to run.

You can pull the motor out and attach one side of the battery to the motor +12V side, and attach the ground to the (-) side of the motor to see if it comes on without going through the resistor pack. If it does, replace the resistor pack. If not, replace the blower motor.

The whole toggle thing sounds like a shortcut was taken to avoid fixing the initial problem.

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Check fuse #14(10amp) located in fuse box under driver steering wheel behind the lower dash cover.
Check fuse#12(40amp) located in fuse box under hood.
Replace fuse(s) if any are blow.

If fuse are good.Check blower and transisto next.
Do steps 1-3 with turn key on
1. Unplug connector and check for 12v at the blue/white wire at the blower motor(2-NAT)
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-if there's about 12v, go to step 2
2.Plug connector for blower motor and unplug connector for blower transistor(4-NAT). Take a jumper wire and jump the blue/black wire to body ground.
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3.check the black wire at(4-NAT) for good ground.
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good luck

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My blower Motor is not working on my 1996 Mercury Mystique. I checked all the fuses, all the fuses work just fine. I then checked the voltage that was getting to the blower motor, and it read 12v. I then...


hello, try this..hook 12 volts directly to the blower motor terminals, it should spin! Check for 12 v at the plug that goes into the blower motor again. if good.. Hook a light tester to 12v supply and then check the ground wire in the plug that goes to the blower motor. if it doesn't light up you have a bad ground connection.
Please vote if this helps

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The heater fan on my 98 chevy silverado stopped working... worked on high at first but made a high pitched noise and stopped all together


Run 12V directly to the motor and see if it will run, if it dosent than the motor is bad, if it does than the resister is bad, the resister makes the blower run and also regulates the speeds for the blower, but chanses are if it was making a high pitch squeel before it quit the motor went out.

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