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Heater fan motor works on high only - 2003 Kia Optima

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Your fan speed resistor has failed......it is located in the heater box behind the glovebox and is sually easy to replace

Posted on Sep 13, 2010

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How do I fix heater fan to operate at low and medium speeds. It only works on High.


depending on car some have a fan relay or its your switch itself

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I would replace the blower motor resistor first then see if that corrects this. The resistor is located next to the blower motor under the dash.

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Only high speed works on fan motor


This condition is caused by a defective blower motor speed control resistor. The resistor is located right next to the blower motor with the connector end sticking out of the ducting for the AC/Heater system. Very easy to replace and the part is cheap as well.

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Heat/ac fan only blows on high


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Heater control only works on high and fan doesnt blow heat thru the vents sounds like its a fan being blown in the wind.


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Heater fan only works on high


this problem is caused by a defective fan speed control resistor. This part is located in the air duct work next to the blower motor.
see photo.


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Heater fan motor wont run on high


Check or have checked the blower motor resistor. This is usually how they act.

Oct 25, 2008 | 1995 Oldsmobile 88

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