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remove the motor, some times its a buildup of leaves or debris stuck in the (squirrel cage fan blade) if no debris motor is old and bearing is worn you can run the blower while it it out of heater box but hold on with 2 hands and have someone turn switch you dont want to break plastic fan blade cage by bumping into dashboard at 600 rpm
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How do you fix blower on 1997 Chevy 1500?
the blower fan is not working in my turck how do i fix it
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Your ac/heater blower motor may be going out, located below the glove box compartment.See "Related Questions" below for more about this easy do-it-yourself repair.
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The blower motor resistor pack is defective. Replace it.
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propably need to replace the blower control switch/resistor
Why does my heater fan only work on a high speed and how do I fix it?
try replacing the blower motor resistor
How do you fix a knocking fan motor on a 1993 Chevy truck?
You will have to replace it. The bearings are worn out in the blower motor.
