Heater blower quits after it warms up.

Asked by DoneMyChoresSeeYa Feb 16, 2021 at 10:20 AM about the 2012 Ford F-150 XLT 4WD

Question type: Maintenance & Repair

2012 F-150 5L. Even at minus 20 my truck starts with out issue. Continuously
warms up with steady heat blowing from all vents. All functions work as it's
supposed to cycling through high to low fan and even AC. But.. once it start
blowing max heat the heater fan quiets completely. If I shut down for a few
minutes and restart the truck, heater fan works again for a bit.

1 Answer
73,480

OJ answered 3 years ago

Possible a bad blower motor resistor. Easy to troubleshoot with a multi-meter. Search on- line. There should be many videos on how to.

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