Fan motor quit working

Asked by Git2work Jan 06, 2017 at 10:53 PM about the 2013 Ford F-150 XLT SuperCrew 4WD

Question type: Maintenance & Repair

My heater blower quit working. All speeds low to
high.  I unplug the wiring harness and put my volt
meter on the terminals and I read around 14 volts
DC. Changing from low to high speed it still reads
14 volts. I pull the motor out and connect it to a 12
volt battery and it runs fine. Put it back in and even
though 14 volts is present it does nothing. WTF? I
read somewhere that if the battery or charging
system isn't what it should be the computer shuts
down any modules that aren't necessary for engine
operation. Maybe I read 14 volts with no load. Once
the motor is powered up the computer sees the
draw and powers down the module? Anyone ever
heard of this?

1 Answer
225,395

Rowefast answered 8 years ago

If you are reading 14 V then the battery is being charged, and is charged. It looks like they have a problem with the plugin that goes into the Blower Motor Resistor. You can purchase a Blower Motor Resistor Kit. Replace the resistor and splice in the new wiring harness & plugin.

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