Electric fan motor only works on High
#1
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Electric fan motor only works on High
I disconnected the wire connectors at the motor. Put volt meter on the wires. I only get 12VDC when the dial is on high. 0VDC on any other setting. I pulled the dash apart and looked at the speed dial. It looks more like a switch with several wires coming off of it than a motor controller. Does anybody have a wiring diagram they can post? Any ideas? I tried the search with no luck.
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blower resistor is more than likely shot, heater switch controls the GROUND side of the fan motor (at least according to my repair manual)
blower resistor is located down near fan motor, unplug connector then remove resistor block, windings/coils can be checked with a multi meter, (should have no opens) have heard reports of guys soldering broken wire and having it work, another thing to note, sometime a failing (high amp draw)fan motor can burnout the blower resistor.
blower resistor is located down near fan motor, unplug connector then remove resistor block, windings/coils can be checked with a multi meter, (should have no opens) have heard reports of guys soldering broken wire and having it work, another thing to note, sometime a failing (high amp draw)fan motor can burnout the blower resistor.
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As stated by nickg and biododge1 its usually the resistor. Mine went out in August but I only lost low speed. They tell me that is very rare, usually you only have high speed. I my case when I removed the resistor it was cracked and looked like it was wet because it was rusty and turning green.
#6
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be forewarned... the biggest cause of resistor failure is the bearings in the motor are going out....i replaced two resistors before i replaced the motor... the bearings bind up and cause the motor to not rotate as it should, in turn causing the resistor to over heat and burn out
#7
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be forewarned... the biggest cause of resistor failure is the bearings in the motor are going out....i replaced two resistors before i replaced the motor... the bearings bind up and cause the motor to not rotate as it should, in turn causing the resistor to over heat and burn out
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