Question about 1993 Chevrolet K1500

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Heater not working fan motor is not coming on

When push the low med or high the fan motor does not come on I replaced the resistor thats because the high only worked after replaceing all three worked untill the other day know all three do not work. I switched relays around still no luck

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  • Chevrolet Master
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Test the blower by running a jump wire directly to the power connector and see if the blower comes on..if not replace the blower..

Posted on Jan 17, 2013

  • kw_kennedy
    kw_kennedy Jan 17, 2013

    when I run that direct hot do I need a ground or is the unit all ready grounded

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SOURCE: The heater blower motor would not work on high,

Try the controls

Posted on Apr 10, 2010

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How do i fix the blower stuck on high


if it only goes on high, the resistor needs to be changed . It is on firewall ,passenger side of car under wiper assembly behind alternator. not a hard job to do, part is not expensive. you will get low,med , and high back. if not switch on dash panel, or change blower motor, last ,since it is going on- working. good luck

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Hi,
Don't go there just yet ! Most heater motor speed problems relate to the heater resistor ! It's located in the ducting close to the motor assy and usually has 4/5 wires on to it and a 2 screw fixing. This componant must be cooled (hence air duct location) and is solely responsible for motor speeds ! You can check motor fan by test lamp/meter ! Good Luck

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Sounds like low speed coil in the Blower Fan resistor block has failed. The Blower Fan Resistor Block is usually located in the air ducting adjacent to the Blower Fan. The Resistor Block consists of 3 or 4 coils of special resistance wire attached to terminals which connect to the wiring that comes from the fan switch and then to the Blower Fan. The block is on the output side of the fan unit so that the airflow from the fan past the coils inside the duct assists in preventing them from overheating and burning out.
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I assume that you are talking about the heater fan?

Your heater FAN has at least 3 settings, and for our purposes we will assume low,med and high

Low and medium run through a resistor High is wired direct
Either your resistor is bad or your fan is
I know it seems wrong that the fan could be shot but it could be pulling so many amps that it won't work in any other mode than high
I just had this happen on one of my trucks
Start with the fan

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When a blower motor does not turn on in low or med. and only turns on high its usally a resistor block. If nothing works it is most likely the bolwer motor itself or a fuse.

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Its the Blower Resistor....If it was the switch, it probably wouldn't work at all....But the Resistor will give you those symptoms, of working on high med or low

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Using a voltmeter, the resisted voltage values for the fan motor are as follows:
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The fan resistor gets 12 volts from each position of the fan switch, and the 12 VDC is then lowered thru each of the 3 internal resistors inside the fan resistor. My guess is that the resistor has failed, and the resistance wires contained on it may have meshed together. The resistor is on the black box between the blower motor housing and the center of the dash. 2 phillips screws hold it in. Easy to remove/replace. Hope this helps, and thanks for choosing FixYa.

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