SOURCE: control knob will not adjust fan speed on heater blower
You need to replace the <<<<Blower Motor Resistor >>>Napa has the part 20-30 bucks it is located by the heater core under the dash.. I just replaced one in wife's car last month
SOURCE: why the heater motor/blower control knob works
Very common when heater blower motor "Resistor" goes bad. In most cases they are either located under hood on firewall, passenger side, or under dash, passenger side, near blower motor. If I can confirm on location of it, I'll get back to you.
SOURCE: blower motor inspection
The blower motor is under the passenger side of the dash. I'm not real sure, but you might have to remove the glove box to get at it.
SOURCE: 96 Chevy blower motor wont work
If you have a test light,check for power at the blower motor,see if it will come on with a wire from battery positive ,to the positive on the blower motor,if it does not,check to see if the motor is grounded,then check to see if the relay has 12 volts to it.The relay should have 12 volts to it,with the switch off.Turn the switch on,and use test light only,touch the probe to all the terminals on the relay,one at a time,with the relay plugged up,when the test light touches the ground,on the relay,it will activate the blower motor,ground the test light of course.Use a test light to chase down the problem,it is the best toll for this,and is not exspensive.
SOURCE: My 2005 Impala has a
Sounds like the fan control module and/or relay..Need to pull fuse until you get it fix,,or the battery will run down
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