The a/c fan in my 2012 F-150 was stuck on a medium setting indicating that the Blower Fan Control Module may have failed. I noticed the fan speed change once or twice on its own while driving and then the third time it stayed on a lower setting permanently.
To know for sure, you may want to run a voltmeter to the module to see if the voltage changes when adjusting the speeds. If your get no drop or change in voltage, changing the module is most always the fix.
Here is the module I bought on Amazon for $29.99 and came next day. I've read reviews that this does not work with dual climate control models such as mine, but others had no issues. This part worked flawlessly:
HVAC Blower Motor Resistor AC Blower Control Module - Compatible with 2010-2017 Ford Expedition 2010-2014 Ford F-150 2011-2017 Lincoln Navigator Auto Temp Control - Replace # BL3Z-19E624-A YH-1829
www.amazon.com...
Негізгі бет Спорт 2009-2014 F-150 Blower Fan Control Module replacement w/ Dual Climate Control
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