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blower motor
02-22-2015, 08:52 PM
Post: #1
blower motor
01 kia optima the blower motor Does not work on high-speed all other speeds work. I changed the blower motor resistor and relay still have the same problem when I have the blower motor speed and high all the wires on the resistor read hot there should not be full voltage on all the wires on the resistor can someone tell me what the problem this I need to get the high-speed on the blower motor working.
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02-23-2015, 12:29 AM (This post was last modified: 02-23-2015 12:32 AM by Garner.)
Post: #2
RE: blower motor
Have you checked the fan speed “switch?” You could test the motor if you know how to unplug it & put 12 volts to it with a jumper wire. If it runs on high that way, you will know that the motor is good. The resistor wires do get hot as that is how they slow the motor. The resistance creates heat while sapping power away from the motor to slow it down. There should be one terminal that is full 12 volts with no resistance. That is the high speed terminal. I have seen some vehicles that the high speed terminal doesn’t even go through the resistor. It is a separate wire all together. Either way; when on High, the resistor usually is cool because it isn’t being used. So if you can’t find a terminal or wire with a full 12 volts you will need to fall back to the switch and see if it is faulty. The hot resistor and the lack of full speed sounds like the switch isn’t moving the power to the full position even if the knob is moving to that position.

Also, make sure that you have the proper ground. Without a good ground the motor won't be able to run properly.

Please let us know what you find.

Thanks for using the forum,
Garner

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02-23-2015, 12:59 AM
Post: #3
RE: blower motor
I think Garner is on the right track but what you are seeing on your meter is probably the "back feed" through the blower resistor. Pull the plug on that restistor and look at the pins for one that is burnt / dark. Do the same thing for the plug on the back of the switch. In my experience, if the blower works at all then the problem is elsewhere. Since the high speed is the highest draw then that's probably got a toasty connection at one of the plugs, which will need replacing. If the switch terminal is also burnt than that will need a new one as well.
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