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Come along with Eric O. at the SMA shop as he shows how to test and repair a blower motor on a 2012 Ford F-150 that is stuck on a medium speed and will not change. Now usually when blower motor resistors fail you still have high or only loose the lower speeds. Lets grab a diagram and a meter and test this baby before slapping parts at it! --Enjoy
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50 thoughts on “Ford f-150 – blower motor stuck on medium speed”
  1. Avataaar/Circle Created with python_avatars David Reali says:

    U put a resistor in a cuz I didn't jave speed 4 or 5 4 and 5 workd for bit then stopped any help would be great

  2. Avataaar/Circle Created with python_avatars Kevin Stump says:

    Thanks for the great video and wiring diagram a few years back! Tried a non-OEM part of AMAZON and did not fix our blower (But with your testing mechanism I proved it to myself it had to be a bad part). As soon as I replaced the resistor with the OEM part working like a champ (OEM is more expensive 30 vs 85 which is why I tried it first)! Seems OEM part is the only way to go here!

  3. Avataaar/Circle Created with python_avatars Edgar Fraga Ariaz says:

    Good job Eric

  4. Avataaar/Circle Created with python_avatars PikesPeak Viewer says:

    Thank you so much for this video. I'm using a standard multimeter and I'm at the step that I'm checking the voltage at the white/purple & black/white. Fan on low= 41.1. Each fan speed higher drops the voltage = 38.7/34.8/29.9/25.1/19.2/13.0. Turn the fan off and it's now 51.4. I've replaced the blower motor and nothing changes, so maybe it's something else?

  5. Avataaar/Circle Created with python_avatars Robert Bonin says:

    Thanks man,no BS and precise instruction. Read my mind when you explained how to do it with just a volt meter. It’s rare that I can find exactly what i need in a clear and exact way in the amount of time that it should take. Was beginning to wonder if it was just me or if I was being impatient because when I need to learn how to do something I normally go for the instruction because YouTube is usually a waste of time for me, but not today.

  6. Avataaar/Circle Created with python_avatars Tony says:

    Anybody having electrical interior issues? I installed some LED Headlight bulbs but the problem was my high beam on my cluster would stay on ..Just explaining the only thing I have changed on the truck as far as aftermarket. fast forward, Monday, notice the lights on my cluster turning on and off and the heat would do the same ,so when the cluster lights went out the heater went out. Now the heat is completely out and doesn't work at all. So with that being said, when turning on my headlights my hazard lights stay on and I cant take it out of PARK ,also signals dont work . signals work only when the lights are off. now with the heater, if ya turn the heater to the on position, the cluster lights turn off and I also cant take it out of park.. crazy , when pressing the break the lights dim on the cluster as well . Ill try and post a video tonight but the truck runs fine its just the interior that I am having an issue with .. Also all fuses test out good ,nothing is blown ..

    Could this be a ground issue ?

  7. Avataaar/Circle Created with python_avatars Tony says:

    I need your help with my truck .. Electrical problem in my truck.

  8. Avataaar/Circle Created with python_avatars Rambo Powers says:

    I checked wiring at the black and yellow wire "ground" and the control wire resistance and it did change with the turn of the fan speed.

  9. Avataaar/Circle Created with python_avatars Peter Carmont says:

    2014 F150 Changed it mine twice and failed again after a few weeks. Any thoughts out there?

  10. Avataaar/Circle Created with python_avatars William Mason says:

    Friends don’t let friends drive fords

  11. Avataaar/Circle Created with python_avatars Kenny Gavin says:

    I just replaced this on my 2013 F150 and it didn't make a difference, still stuck on high. Does this mean the actual motor needs to be replaced

  12. Avataaar/Circle Created with python_avatars Ryan McNab says:

    Thank you for your videos. I just had to replace this part on my 12 F150 and this video helped me out.

  13. Avataaar/Circle Created with python_avatars biggtymer64 says:

    I replaced the blower resistor under the glove box and it turns off. It works on high on old resistor. So reinstalled it for now. What else could it be?

  14. Avataaar/Circle Created with python_avatars Ricardo Rodriguez says:

    i chance the fucking blower resistor at first time and no lost time in bla bla bla

  15. Avataaar/Circle Created with python_avatars Tyler p71 says:

    2007 crown Vic Blower motor has little to no air anyone have any advice have replace blower motor and blower motor resistor

  16. Avataaar/Circle Created with python_avatars Rich L. says:

    New subscriber – what camera/audio/lighting setup are you using? Nice job with your vids, very informative. Thank you for taking the time to do all the videos.

  17. Avataaar/Circle Created with python_avatars Carl Byington says:

    Great vid Eric…… One thing we struggle with here in the bay area (San Fran) is that I have to charge my $140 an hour to diag a $50 part often……..sometimes it pays to roll the dice (if its an educated roll though)..SUPER appreciate all the GREAT education Eric !!!!!

  18. Avataaar/Circle Created with python_avatars Tired old mechanic says:

    It's easy to diagnose which part in the system of German-made cars and equipment is bad. Just check the prices on all of the components. It's always the most expensive one.

  19. Avataaar/Circle Created with python_avatars Billy Yoder says:

    Thank you Eric. Does the duty % change about 10% per speed selection?

  20. Avataaar/Circle Created with python_avatars Aaron Johnson says:


  21. Avataaar/Circle Created with python_avatars jerryDoyle England england says:

    I am a HUGE SMA fan…but I HATE the pop up ad's….makes me wanna unsubscribe….!!!! I HATE pop up Ad's…..

  22. Avataaar/Circle Created with python_avatars mitchell baxter says:

    South Main Auto Repair. I just replaced my blower motor speed controller/resister/control moduel. Whatever the hell it's called. But my fan speed is still intermittent. Fan will cut out intermittently at all settings, a.c./max a.c., heat, and at all speeds. It will cut out and about 40 seconds later come back on, sometimes for a while, sometimes only for a second. Any recommendations on where I should be looking next?
    It's currently at ford and they tried replacing the module that communicates from the a.c. to the nav system and that didn't work. They said they're going to try putting it back to stock to see if it still does it but I don't have much faith in them to fix the issue.

  23. Avataaar/Circle Created with python_avatars Volatile says:

    My comment vanished. I was talking about how I had a f150 same year with a blower stuck on the 3rd setting. Changed the resistor when the PWM signal was good and responsive. It acted right for 30 min then would shut off and turn back on a minute later on the two high settings. I checked the blower found the ground missing then i checked the black with white stripe feed to the resistor and it had 36 ohms of resistance, which seemed quite high. T tapped a new ground in to it only to find I had a bad resistor out of the box. Ordered a new one, that wont have to deal with the ground problem now.

  24. Avataaar/Circle Created with python_avatars Volatile says:

    +South Main Auto Repair I had no burned connector, old resistor was stuck in 3rd setting on all commands. The black with white stripe going to the resistor is the ground feed and it had 34 Ohms of resistance, which I found to be off if its supposed to be a heavy ground supply. T-tapped a ground into the black with white stripe, soldered that for a good connection. All the settings work but then I noticed the new resistor would crap itself if the truck was turned on and running, in either of the top speed settings, even with the new ground. The blower motor would lose its ground feed at the motor from the resistor, with a new resistor! Parts are crap now days. Ordered up another one. Nothing else it could be that I can figure out at this point from my scanner readings.

  25. Avataaar/Circle Created with python_avatars FlattenedTrain says:

    My 04 grand Prix blower motor run turn on by its self when cars off. After I get back from a drive. the car will be shut off for 15 min the blower motor will turn on run for 5 min than shut off and not go back on tell I repeat the process. I have a new blower motor and control processor acdelco brand.. it had this problem before and after I replaced those parts. Shops around my town can't figure out the problem!

  26. Avataaar/Circle Created with python_avatars URGENT! "Cory Barbee" YT ch.👀 says:

    on a 2012 lol y u do dis, ferd?

  27. Avataaar/Circle Created with python_avatars Jack Shimano says:

    WOW !! -infernal "computer " controlled heater motor ! =defies the KISS formula !!
    like "computer" controlled alternators =WHY ??
    -how is average mechanic gonna diagnose problems short of replacing EVERYTHING until problem found ?
    you are FAR BETTER than 90 % of mechanics I know-who keep changing unnecessary parts until ~`

    -recall in 1970s when Volvo among others (Mercedeze,etc) had 1st BOSCH fuel injection
    -modules usually buried under drivers seat-and entire "ECU" had to be DEALER replaced

    I discovered that ONE transistor was faulty since running (unsunk)at 3w-so replaced 5 w $2 transistor with 17 watt $4 item/unit
    -so $ 10 PERMANENT REPAIR instead of $250 ECU replacement-that also soon failed again due to SAME BAD DESIGN

  28. Avataaar/Circle Created with python_avatars Gary Roth says:

    I can't do it lol

  29. Avataaar/Circle Created with python_avatars Hola! Michael Spisak says:

    Been watching your videos for a little while and subscribed. Gotta tell you, Very good information with entertainment value added. Keep up the good work and know that we sure could use more techs like you !!!

  30. Avataaar/Circle Created with python_avatars Brian Alexander says:

    hey Eric how come I never see you use a power probe?

  31. Avataaar/Circle Created with python_avatars william nicosia says:

    Hello Eric! This is my first comment to SMA. I can't tell you how informative your videos are to an amateur like myself. I wanted to ask if you have come across any/many cases of lower intake manifold gasket failures on SBC/350's and the symptoms /diagnosis you followed. Thanks again.
    Bill N.
    Dutchess County, NY

  32. Avataaar/Circle Created with python_avatars Herbert Cammock says:

    Mr. Eric I have a problem with my 2011 Ford mustang gt and I have the check engine light is on so I put my scanner n it and its the P0300 multiple miss fire o I ordered a crank sensor from amazon and couldn't find a youtube video to locate it more research led me to the back of the engine on the passenger side .  So I took off the sensor and found out that it wasn't it please the car wont run a nd I have no Tach please help I have to find the right location and a pic of what it looks like… thanks love the videos

  33. Avataaar/Circle Created with python_avatars Robert Kutz says:

    nice work.

  34. Avataaar/Circle Created with python_avatars Died 4 US says:

    I had to change the resistor, and solder in a new pigtail connector on my 05 chevy colorado, which should have been fixed in a recall, considering how many of these burn up the connector pin and the resistor. Luckily I looked this up and found out that there was a tsb for this problem and didn't have to chase the problem down. My next vehicle will probably be a Toyota or a hondu, even though growing up my gramps would get fired up if anyone in the family bought a foreign car, called them jap scrap, of course he was a w.w.2 vet and a little prejudiced towards American built cars. I buy what lasts me the longest, and is well built, got this vehicle from a family member at a good price or I'd be in something with a better reputation. I have had pretty good luck with it over the last 6 years, this is the only thing besides brakes and tires I've had to deal with, but it was maintained properly before I got it, and that does help. I live in michigan, so I can appreciate your struggle with the rust monster. Thanks again Eric, for another great video, short or long, they are always good entertainment, and keep me up to date on the newer vehicles. You need to have your wife do another fix it video, you guys are pretty funny.