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Blower motor slowed down then it would speed up it quit for a few seconds

Tiny
DALESAAL
  • MEMBER
  • 2006 FORD F-150
  • 5.4L
  • V8
  • 4WD
  • MANUAL
  • 175,000 MILES
I have replaced the blower motor and the blower motor resistor. It was working on all settings, and I set it on auto A/C it slowed down then it would speed up it quit for a few seconds then went on high then it just stopped. Like I sad the motor is new, and it has a new resistor, it did the same thing with the old motor. Please help. It is a automatic transmission, not manual.
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Monday, August 24th, 2020 AT 6:36 PM

1 Reply

Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
Unfortunately, we need to act like we we haven't done anything yet. We can't assume that the blower motor or resistor is not the issue. So I attached the wiring diagram and we need to check power at the motor and then follow it back through the system in order to find where we have power and where we do not.

I would suggest jumping 12 volts to the blower motor just to make sure it turns on. If not then it has failed.

Just to be clear, did this fail the same way the last one did?
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Monday, April 19th, 2021 AT 11:11 AM

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