Here is a picture of the resistor
3 parts can be the cause: motor, switch, resistor. Depending on model and year, blower may be easiest place to start. You want to pull the connector there and check voltage as you switch the speeds. Voltage should be 12.5 on high and progressively lower for lower speeds. If voltages are good, the motor is bad.
If no voltage there, check switch or resistor. Send me your car info and I'll try to get you some instructions.
more than likely the blower motor speed control resistor thermal fuse has blown, replace the resistor 1st, it is very cheap.
The motor's not too hard to get to:
Disconnect the negative battery cable.
The blower motor is located on the passenger side of the vehicle, under the instrument panel. Remove the right side sound insulator (trim panel) by removing the retainers and disconnecting the courtesy lamp.
Detach the blower motor electrical connector.
Now do you have a voltmeter or at least a test light to see if there is voltage?
As emission wiz says, the resistor is also easy. If you can find it, and it looks burned, you know to replace it. I will see if I can find the location, else emission wiz may know off hand.
Oh, I see what you are saying. This car has a blower speed controller--not a plain resistor. So where is the thermal fuse? Is it at the blower or at the control panel?
There is a 20 amp "low blwer" fuse in the cabin fuse panel--is that it?
there is also a 30 amp HI BLWER fuse there--but these are regular fuses--not thermal, right?
I'm still seeking learning from the wiz...
the thermal fuse is part of the blower speed control resistor or module whichever it has, if u pull it out u will see a little part that looks like a resistor on the end, jump that with a piece of wire, that is the thermal fuse.
hey man thanks for the info chevy is gone today but will jump that resistor this evening. that wont damage any other parts?
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next you tell us the model and the year.
2004 chevy impala dual temp controls
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