Ford F-150 - Blower Motor Stuck On Medium Speed
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- Опубликовано: 26 июн 2017
- 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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--Eric O.
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Due to factors beyond the control of South Main Auto Repair, it cannot guarantee against unauthorized modifications of this information, or improper use of this information. South Main Auto Repair assumes no liability for property damage or injury incurred as a result of any of the information contained in this video. South Main Auto Repair recommends safe practices when working with power tools, automotive lifts, lifting tools, jack stands, electrical equipment, blunt instruments, chemicals, lubricants, or any other tools or equipment seen or implied in this video. Due to factors beyond the control of South Main Auto Repair, no information contained in this video shall create any express or implied warranty or guarantee of any particular result. Any injury, damage or loss that may result from improper use of these tools, equipment, or the information contained in this video is the sole responsibility of the user and not South Main Auto Repair. 
Авто/Мото
When my blower isn't working well I usually take her to the mall on a shopping spree. This usually results in an increased duty cycle.
LOL HAHA Yes you win the comment section sir!
I fianlly won something! haha Hmmmm wonder what it is?
LOL my blower is intermittent, she seems work fine when i'm out of town !
Ozzstar li.
Eric, i have been watching your videos for over a year now, and you have the best videos out their . keep them going man. Jeremy
Good Job Eric. Thanks for taking the time to make all of these awesome videos.
I had today off and I thought take a ride and see if I could visit EricO ...so I headed out to SMA from E.A. New York and then about and hour and 45 min later I arrived at SMA and was greeted by Mrs O..and introduced me to "The Man!". Him and I talked for a little while about some mechanic stuff witch was pretty basic...because for me I am a carpenter(by profession) and a DYI mechanic and the I have to pay someone to fix my vehicles if it out of realm of capabilities. Anyways the point of this comment is to say Thank you Mr and Mrs O for being so nice and thanks for SMA swag. Also thank you for taking the time. You two are awesome!!!
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 RUclips is usually a waste of time for me, but not today.
Thanks for explaining how to use a multimeter as a scope. Like how you've been keeping in mind the DIY's lately; how they can approach a problem. Great video.
Eric O. I love your videos. Even in a rush you slow down enough to test it. Must be a treat to use OEM parts not that Dorman junk. Eric O is the guy that can fix anything!
The man with the plan. Excellent video Dr. O.
Your awesome. Even if your in a hurry, or busy, you always try to put out a video for us. I appreciate that. Your a good man.
Try not to pass up an opportunity
Excellent demonstration there Eric, nicely done.
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 !!!
This is why I started watching SMA. Two years ago I had the same problem with my 04 F150 and searched RUclips for a fix, I found a guy who showed what to look for and how to repair it I don't remember who it was but I got hooked in watching car repair videos that's when I found SMA and have been a fan ever since!! Thank you Eric!
Cool man!
Nice quick lesson! Good one on showing that your meter can still check a PWM signal with a DVOM. Scopes the way to go, but not everyone's got one. Nice one Eric! ~Mike
What a great guy, genuine, sincere, enjoy the videos
This I could do with my old meter - good to know. Thanks for showing this one!
Still got to grab one with a Hz setting - the '92 Ford truck vid from yesterday illustrates that perfectly. Great pair of vids.
Lunch time videos. Quick fast and to the point baby. Love it
Thanks Eric.You teach really well ,love your channel.
I just fixed the fan control module on my daughter's Accord with the same symptoms. I replaced the power MOSFET for $3. Since I used to be a bench tech at a communications company, it's always a special pleasure to troubleshoot to the component. Love your videos! Best mechanic on RUclips!
Wow cool fix Rob!
Metal Oxide Silicon/Field Effect Transistor. I knew what he said without looking it up. Retired comm/electronics. @@SouthMainAuto
Thank you for your videos. I just had to replace this part on my 12 F150 and this video helped me out.
SMA....best repair videos in the world. Keep them coming, and I'll do my part sending monies through Patreon. Thanks Eric for taking the time to show us the ropes.
Well thanks Robert!
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!
My blower was stuck on high even with the HVAC turned off. I don't have any of the diagnostic tools to run the tests. Just went ahead and got the part hoping it would fix my problem. It did! Thanks for the video. Really simple fix.
You are a great all around mechanic, Hard to come by nowadays.
Thanks Charley!
you know. You are a real O. G. thanks for all you do for you tubers South main auto. i hav customers every day come in with a self diagnosis and some of them say they know that's the problem because they saw you fix a similar problem. on South main Auto. keep up the hard work. ps please don't charge for any videos.....
Quick and easy, thanks Eric!!
love the explanations Eric, thanks.
If only eric O lived closer to NYC.. you would be my go to mechanic..
I'm probably one of the few that use a PWM switch on a boat. I use it to dim my l.e.d. lights that I night time fish with. Nice Video!!!
Nicely done sir!
Again. Great job Eric!
Nice quick diagnosis & repair. Test & prove !
A very cool vid. my friend. Best of luck man!
Nice job Eric, Way to spring for the OEM Motorcraft part! Was almost expecting a BWD replacement and having it not work out of the box haha
There is a reason why they call them (BWD) broken when delivered.
Good job Eric
Thank you Eric. God Bless You
Thanks for including volt meter test for us DIY guys who do not have a scope.
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 !!!!!
You diagnosed that baby all zippy zap quick. Your friend is a lucky man to get a quick lunchtime fix! Thanks!
He is the manager at advance so gotta stay on the good side ya know ;)
South Main Auto Repair I'll bet it not a dorman part goin in
(he's your brake cleaner connection, don't hide your addiction)
Great Video Mr Milkman
Nice fix
nice work.
Tank you and all other RUclips mechanics you made my life easier now I tell my friends my relatives don't worry I can fixe it
Thank
Good video that's the way I would diagnose the problem BTW I have a snap on vantage pro really like it saves time
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
Scope is handy but basic meter gives the same result. It's more about understanding the workings of the circuit than the hardware. Excellent video with good circuit presentation !
Thing is you can buy a scope for the price of a good meter now days. amzn.to/2skuA9z Thanks Tom!
Awesome Video !! Thx Bruddah!!
Thanks for the video
Fantastic thanks
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.
Hey Eric O. I'm a Honda guy (CR-V and Civic), but I'm considering getting a new 2018 chevy traverse when it's released. How different are Chevys and Hondas in terms of reliability these days? Keep in mind that I maintain my cars religiously, so I would never miss a fluid change or maintenance item regardless of what I buy. Also, you are the BEST mechanic on RUclips. I've been a subscriber since you only had 2,000 subs.
thank you Eric sam
Good for you, to show how this is done with a simple voltmeter for those who don't have better tools.
Cool Eric. We now have defroster motors on our buses that are bldc that have a control module and 3 hall effect sensors that relay the position of the rotor to the control module.🙂
Just like GM, that is how they do their blend door actuators. Uses a count value after it is learned to assume position. Cool.
South Main Auto Repair And then the owner assumes the position when it breaks. Lol
we don't design them we just fix them
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.
ever ford i have owned the resistor failed or the blend door broke and it was stuck on defrost..good video eric
couple more fords and we can say south main ford channel :)
Thank you Eric. Does the duty % change about 10% per speed selection?
Hey Eric do you have any good WOT test for the Ford 3 valve with the VVT ?? any ideas what it should be reading?
on a roll with the F150's lol I would off skipped the diagram and meter and gone with brake clean as first approach :-) . best crack on with the work as those 150's will be junking up your yard space lol .
I would love to have a scope, but I'm on a tight budget. Can you recommend a cheap one to buy?
Hey Eric good morning I have a question for you I have a 97 Chevy Tahoe 4 x 4 in the air condition just keeps on throwing air on the dashboard on the defrost on top and on the bottom I changed out the actuators but he still keeps on doing it any suggestions
Good job Eric how much is that snap on scanner you just used
I bout it used for 600
How do you have time to do all these videos and be on the Big Brother TV show Eric?
Tool box tour or shop tour?,
Eric, how many like do you need for that?
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?
thats hard as heck to do on the lincoln towncars with every single thing in the way! i just did one on a 2000 towncar took longer to backprobe than replace the heater hoses purge valve all in the way!
yep the old days an ohm meter and voltmeter ya was gold. you just showed in the last 2 videos that unless you know how it works you really dont know what meter to use. when in doubt get the scope out. that control could be analog digital or a mixture of both. make a guy want to let the smoke genie out and wire it up right !
Thing is now days guys in the shop have no excuse for not owning a scope. You can get one to do stuff like this for a hundred bucks and something decent for 500. If they can't invest into the tools to fixem right then they are in the wrong trade IMO. Thing is too it is nothing new like people tend to think. I have a full lab scope ignition meter from the early 80's. I think it is just the fact that no one uses them perhaps?
Cool. A vid on a yr/make/model I own!.
Even the Advance parts manager wont use there own parts
lol, no comment
I worked there around 10 years or so ago. I never used their parts.
I have a quick question 2005 Chrysler Town & Country Cam and crankshaft position sensors out of sync at start is that how it's supposed to be
Question? 2013 f150 change blower and resistor now fan barley blows could it have been wired in backwards also no cabin filter
hey Eric how come I never see you use a power probe?
2014 F150 Changed it mine twice and failed again after a few weeks. Any thoughts out there?
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
Hey Eric, I thought for sure the problem was rat poop in the motor! The electrical engineers finally figured out how to use PWM. My old van used some big ass resistors in the firewall in series with the motor. How crude! Must have been designed by mechanical engineers!
Crude but have you ever seen one fail ;)
You're probably right. My failed I think because it was in the same position as that MAP in the F150 is your recent video. The connector was so rusted I had to completely destroy it to get it off. I know most people like to see repair videos, but I'd like to know what your experience has been with direct injection. I can see how conventional fuel injection and electronic ignition has improved reliability. An ETCG1 style video would be cool. By the way your videos are top notch. You're a natural in front of the camera. Ever consider acting?
We the people have spoken MR O !!! How do we bling up our wheels for under $10 😉😂😂
Simple, go out in the middle of the night, drive around and find the set you like, be really quiet and really fast....
Hahaha!!! *officer MR O said I should do it* 😂👍🏻
Nice job. The engineers that design the places where components live should be made to change the parts and maybe things would be easier to work on. Thanks for the video's.
This one was pretty easy really
More Ford Repair Videos Please
Awesome video.
Very thorough and slow enough to understand.
I expected it was this on mine.
Old man winter coming to Canada so put er in.
Thks
Cheers
Dave
Alberta Canada 😊
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?
Did you take the old blower motor speed controller apart and have a peak inside? Is it just a transistor on a heat-sink or does it have some kind of "intelligence"?
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
Interesting that it was stuck on medium. Every blower motor I have replaced seems to be stuck on High or rather only work on high. All of the ones I have done have been on cars with a speed setting switch (knob). Do the digital ones work different than the more manual with the knob.
FrugalPrepper I have a good one for you, it's a 2002 pontiac grand prix gt gives the option of 5 speeds but only 1-4 work.
That is common on the GM's like that because they use a separate relay circuit for speed five
old school blowers have resistors for the lower than high settings so when the motor starts to gum up and it draws more amps it over loads the resistors and burns those out and you are left with direct power on high till the motor fails or it blows the fuse.
this Ford uses the unusual method of pulsing the ground on and off at different speeds to control motor speed, the HVAC controller sends a pulsed signal to the speed control and it uses that to vary the speed.
some use a AC brushless motor, their controller sends a speed signal to the motor controller and it converts the DC battery power into AC power and the frequency of the AC power is varied to change the speed of the motor.
You get a new cap?
That fancy-looking geegaw-laden control panel is from a "truck?"
Yep
As you know Eric, not all mafs like the blue Ford run on hertz variation; the maf on my car has variation on voltage to the ecm only.
of course...
Eric, have you had any issues with the 10 amp fuse coming loose in the back of your vantage pro ?
No not yet
I must be the only one.
Does the resistor itself gets hot to extremely hot?
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.
+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.
I appreciate good troubleshooting (I'm an IT guy). For me, we have 4 vehicles, all Dodge/Jeep between 97 and 02. I've had to replace the blower resistor in 3 of them so far, all in the last 2 years. I opted to just replace the resistors, because I knew that if that wasn't the issue, it would eventually be and I'd have the spare on hand. If I was to troubleshoot the one of mine that is digitally-controlled, would it be possible to test the pulse with a multimeter or test light? or is a scope the only option?
Matt Hooker Ive replaced it 3 times in my wifes Pacifica never in my 02, 300m
A PWM is frequency- so a "digital volt meter" won't see a sine wave, and a sweep-meter will only see a measurable pulse- an incandescent bulb will dim and bright, so a scope is the best tool.
I understand that a scope is the best tool. However being a DIYer I'd prefer getting by with more basic (affordable) equipment. If I can observe the pulsing with an incandescent test light, and the change in frequency when I adjust the knob, then that works just fine for me.
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.
mitchell baxter sounds like the hvac controller (the unit w all the knobs and button)
I had a Citroen C4 in last year with a blower motor stuck on gale force.The buttons up top sent different voltages to the blower module which was supposed to vary the fan speed to suit, but the blower module was ignoring it. New module for the Citroen was £158 !! whats wrong with four resistors I say lol
My 77 F150 has this under the dash, then my 95 and 2000 Fords have it under the hood where you are usually changing the resistor and splicing in a new plug and pig tail. 40 years later, they went back to the better design.....
2007 crown Vic Blower motor has little to no air anyone have any advice have replace blower motor and blower motor resistor
Yesterday On my Chevy Colorado I had to replace the resistor wiring harness electrical plug. Half the time it would work on the other speeds. Looked like just one of the terminals in the plug got hot.
Boy, I wanna say GM had a TSB on those and a updated kit... what year is it, I'll look? Also I have seen issues on some of the GM's that have repeat resistor failure (melt downs) where the blower motor amperage was a tad on the high side. I have several known good amperage specs on those in my notes.
South Main Auto Repair Its a 2006 . It wasn't all melted. When I unplugged it I had to really look and I could see that just one terminal looked like it got hot. When I was going to Southern California it worked I would stop at the gas station then it wouldn't work. The next time I would stop it would start working again. The resistor wasn't bad.
Yep memory served me right:
#PIT3688A: BLOWER MOTOR INOPERAT IN ANY ONE OR MORE BLOWER SPEEDS - KEYWORDS CONNECTOR HIGH HVAC LOW MEDIUM RESISTOR TERMINAL (JAN 4, 2006)
Condition/Concern:
Blower motor inoperative in one or more blower speeds. This concern is due to a loose connection at the blower motor resistor.
Recommendation/Instructions:
Inspect the connection at the blower motor resistor. Replace the blower motor resistor and any terminals in the female part of the connector that show evidence of arching or corrosion. The replacement connector and terminals are listed below.
Part Number 15306069, Female Connector With Leads. Replace the connector body with leads only if the connector body shows signs of damage. It may be necessary to generate a SPAC case to obtain this connector with leads.
Part Number 12176387, Replacement Female Terminal. This terminal is made of copper-beryllium and can be located in Delphi tray 3 of your Packard kit. Only replace the terminal(s) if the connector body has no evidence of damage.
Replace the blower motor resistor only if it shows signs of arching or corrosion at its terminals. Use current SPO stock.
South Main Auto Repair Thanks. That has to be it. Caused by a loose connection. At least it was easy to get to.
No prob
have a question for you I replaced mine in my GMC 2008 5.6 liter it is not blowing half as hard is the original and used to blow your right out of the cab I had replaced the resistor that didn't do it so I went ahead and replace the squirrel cage and believe it or not after living in Arizona and it constantly running the bearings were shot so I replaced it and return the resistor but I do not get the power I used to get out of it what should I do
did you replace your cabin filter??? that could be restricting the flow
no were is that located
i guess in 2003 gmc dicontinued cabin filters according to google, just thought is was an option but i guess yours doesnt have one, usually they are behind glove box
look yours up on google, you could also have a blend door accuator problem. could be vacuam operated or electric. if it doesent divert air correctly in your ductwork, you wont get the right airflow
I need your help with my truck .. Electrical problem in my truck.
Yeah that's usually the problem when the blower motor only works on one speed we called it a reostat I've done a few of them.