GMC Yukon HVAC Blower Motor Won't Turn On

[@wtfman5313]

Paul Danner is a one in a million instructor. I didnt know anything about automotive controls a year ago, now I troubleshoot my own vehicles because SD Premium opened up that world to me. Thank you Paul!

[@ScannerDanner]

Thank you for this comment! That is awesome to hear.

[@mohammedeshag3866]

m

[@mohammedeshag3866]

This is a right diagnoses and helpful.But there is still my be a soldiering problem within the bowler Model or a losing harness.

[@ScannerDanner]

I did mention that and also that the harness was fine.

[@SyedZaidi-r7l]

@@ScannerDanner,

[@2Jeezuzisreal]

On my 05 Yukon the wires fried 2 times. bypassed that resistor you're holding. Eliminated it. I use the heavier 10 wire and ran it to the battery but decided to connect into that red box under the alternator. Used a 30 amp fuse. I bought a heavy switch mounted on the dash. Has only one speed. But I also have the rear heater variable. I've had unusual amount of problems with the actuator doors not opening or closing properly so I in the back I opened a hole through the sidewall and permanently put in a screw to hold the flapper door up in the heat position. Since my AC doesn't work anyway

[@ScannerDanner]

The wires will "fry" when you have connection issues. Resistance equals heat.

[@akawireguy1197]

You are so blessed to have a readily available camera man you already know how to communicate with. Having a living breathing mind behind that lens leaves you free to teach. I bet a close inspection of that board under a good magnifying lens would reveal just what you said. Thank you lead free solder.

[@billk5727]

Paul Danner is an awesome instructor. I've been a member of the Scanner Danner Premium channel since early 2015. You can't beat it! Bill K

[@ScannerDanner]

Thank you Bill K!

[@madmotorrepair1748]

Every day I go through preliminary steps and think of the variables to a situation to carry out a professional diagnosis, and it has made me more successful as a Semi Tech. I would never have known these steps if it wasn't for Paul. Learning from Paul has improved my life, and others that I have help along the way. Thank you.

[@ScannerDanner]

Thanks so much!

[@Orell_Dee]

That was a textbook diagnostic you did there. I'm new to the channel but would love to learn the ways of the Jedi. Electrical diagnostic that I could understand means that I could also learn how to do this stuff myself. That would make my family proud.

[@pedrovaldez9559]

Wow...this is a great video! This guy is very interesting! I usually skip through all the unnecessary blah blah blah, but this guy here makes you want to watch and listen through it all. Great instructor! Best video I've seen yet concenring this subject! And I don't know anything about fixing cars! Lol!! This videos helps! Thanks man!!!😎👍

[@ScannerDanner]

what a great compliment! thank you so much

[@Travelingman-1980]

Getting older is a bitch, we all need readers one day. Thank you Calib!

[@matthewcohen3521]

Love that you overlayed the "sillyscope" to demonstrate the pulse width modulation, love a good technical demonstration.

[@pichopalomares3517]

Thanks for the video, my issue was on the plug that connects to the blower. Same thing just unpluged and pluged it again and it started working like a champ. *same type of suv*

[@NoName-be5ir]

Well no fancy gadgets, but seeing you plug that back in and bam working.. so first I found I had power at red and purple. Then I unplugged each one and bam working.. plug at the blower is bad. Blowing cold!!! Thanks , but keep us dummies in mind with only simple gadgets. Great video i learned something about the functions and the fancy tool did a good job showing the pulse from that little wire.

[@jeffsummers7242]

Replaced the module/resistor. Exactly what I needed, just watch the $50 at autozone, $30 on amazon. Mine old one had corrosion on the top fins, but at first blower would stop, and come back on with a whack, then wouldn't anymore, but would when connector wiggled a little, but not stay on. Thank you KZbin for helping fix half of my problems.

[@jeffsummers7242]

Come to find out, module wasn't bad, but found wire connector was bad where it connected to fan. New wire bundle is $60at dealership.

[@brandonueki4342]

@@jeffsummers7242 same here. I cleaned the connector with electronic spray. Now it’s working again. Next time, I’ll replace the entire wire harness like you.

[@cwj9202]

I have to complement you on the manner in which you explain the two powers and grounds and one signal wire. With old guys, I use a relay analogy, but I would say your method is way way better. Keep up the great work.

[@actifenpleinair3784]

Wow, Great break down in simple terms, yet covering all the bases! I was able to pop open the cover and simply unplug ad plug the connector with key off, key on and the system works again. going to order a new controller if it ever happens again, will be a 5 minute fix! $21 at Rockauto or 40's locally, not a big worry for now!

[@ralfsautomotive]

I'm going to drop by there on of these days when I am up that way. I just like the way you go about teaching this stuff to young and old.

[@ScannerDanner]

That would be cool man. Thanks!

[@radmilakrejci8581]

absolutely great video explaining how does blower module operates and testing with scope.

[@nutsandbolts7407]

Wow I definitely came back to watch this and it confirms that I did diagnose my neighbors Yukon correctly..at least in the right direction....the voltage does change(I checked with a multimeter) as I raise and lower the fan speed...so I believe the resistor is bad.....thanks for the great help again!!!! (Blower stays on without key)

[@ScannerDanner]

Good call on that module. There is no input we need to worry about when the fan module keeps the blower on without an ignition feed. Because everything is powered down. Make sense? Good job on checking your blower module (resistor) inputs though. Thank you!

[@nutsandbolts7407]

@@ScannerDanner yes since it stays on....we know that it has all the inputs needed to function? Power,ground,signal etc??

[@ScannerDanner]

@@nutsandbolts7407 it tells us the driver is shorted with almost certainty

[@nutsandbolts7407]

@@ScannerDanner oh ok.. awesome great help as always! Thank Yu for your knowledge....looks like il be changing a module tomorrow!

[@mbarry9737]

Love the superimposed scope over the video, great editing!

[@koolpoll86]

Augmented reality! Rare to see this

[@swfloridacarguy1987]

Thanks Paul and Caleb. Being a old and former GM tech you two are keeping my mind very active with your channel. Also appreciated the Dodge Dakota vlog and the diagram you did at the end of that vlog...

[@MechTech5000]

I have power and ground to the module and ground from the module to the blower motor but no power to the motor. Also when I add ground and power to the motor it doesn’t run. Does that mean it beds both motor and module? Or could the blower motor be being bad cause the module not to provide power?

[@sergioflores7169]

I have an issue with my blower module. I was told that if the blower module goes bad it can take out the blower motor and vice versa. If the blower motor has too much resistance ( a worn bushing maybe) it can damage the module. One should replace both at the same time, more so if they are original items on an older vehicle.

[@brodericklancaster7237]

You can tell you are a dam good instructor, thanks

[@jordydereus]

I am having dejavú. Pine hollow auto diagnostics had the same video!! good vid paul. we love you. keep up the good work.

[@ScannerDanner]

Cool man. Tell Ivan I said hello! I don't have time to watch KZbin videos, I don't even watch my own brothers videos.

[@evantac]

Your video is getting more and more interesting,like your meter reading and the waveform showing together while you were explaining,nice.

[@insomniacinsomniac8172]

Paul, thanks a lot for what you and Caleb are doing! I'm not even a mechanic, I'm just an IT guy, who's living overseas and like to repair his own cars, but the foundations and logic you teach are incredibly useful to me!

[@juanitogaspar8728]

Thanks for your videos! I had the same issues with my Avalanche. You saved me $$$$

[@iameshu1146]

Same here but I replaced same module still doesn't work. Any suggestions? 08 Avalanche. Thanks.

[@theadventuresofjavier8698]

Good morning Paul. That GMC is a diagnosis techs dream/nightmare. Always happy to see a vid from you. Cheers mate.

[@ScannerDanner]

For sure!

[@arinhiwa4017]

Well-done You could explain the GMC blower issues well , and diagnose the car problem in detail . TQ Instructor .

[@ekimbrough1413]

Thanks Paul and Caleb! Another great vid!

[@daleaustin1969]

Awesome video 100% accurate and articulate step by step instructions for anybody that's weakness is auto electrical fixed mine in minutes than you Dan!!

[@ScannerDanner]

Thank you! BTW my name is Paul Danner 😉

[@daleaustin1969]

@@ScannerDanner all apologies.. thank you Mr. Danner

[@ScannerDanner]

All good, I get that a lot

[@daleaustin1969]

@@ScannerDanner soooo (exact same truck/symptoms as this video) and blower quit AGAIN... new module (per video) & fan spins instantly when bench tested w/ car battery. am i to assume the actual $300 hvac controller is the only thing left??

[@ScannerDanner]

@@daleaustin1969 not sure if you are still fighting this or not, but I would look at the parts you replaced first. Electronic parts are junk these days

[@andyd8185]

thanks Danner (Paul) you saved me some time and money... keep up the great videos .. Cheers from Canada

[@rodneymccrea465]

Just done one on a 2002 Chevrolet Impala 3.4 liter, it was a motor resistor, blower motor was good

[@vt2704]

I love when there's a possibility of circuit board repair. 👍 video.

[@davesage9190]

Understanding that you don't really have the time or financial incentive to do so - but it is really satisfying to actually fix one of those modules. As you pointed out it is likely a cracked solder joint and the symptom pointed you to it likely being the motor ground connector pin. Just take a minute or two and get the big soldering iron (or gun) out and reflow the solder on the pin connections (and everything else nearby) on the pc board, adding a bit of solder to make it flow nice. It's a good feeling when you can save your customer - what? - maybe $100 and if it's your own vehicle, your own money. A feather in your cap too (and maybe future business) if you can tell the customer you saved them the money too. (Sorry I guess I've spent too many years in the electronics business fixing equipment to component level ) :-) I can understand if your industry has a different outlook. Good troubleshooting technique Paul. Thanks. I enjoy your videos. davesage.ca/

[@ScannerDanner]

I'm totally with you Dave but what you didn't see in an edit was I was not prepared to fix this one. My eyesight is not what it used to be and I definitely needed a magnifying glass to even attempt it. Then the only soldering gun I carry with me is a butane one that is not meant for such small soldering. Thanks for watching! Next time maybe, I'll be able to do the component level fix. I wish I could have too

[@davesage9190]

No Problem Paul. It wasn't meant to be a negative comment. More meant to let others know that there is a possible further step that can add great satisfaction if successful. Especially when it's your own piece of equipment and money your saving. My home furnace quit a few years ago and through a similar process I traced the problem to a cracked solder joint on the controller circuit board. Seems they thought it was a good idea to solder a heavy transformer onto the circuit board in a furnace that is continuously vibrating. Soldered it up and away it went. The alternative was to try to find an obsolete replacement controller or a new furnace for a few thousand bucks. Made me feel good to fix the whole problem. Thanks Paul. Keep up the good work.

[@ScannerDanner]

I didn't take it as negative at all Dave. Thanks for the comment! I agreed with it

[@swgarealtor]

Thanks for the information. A lot to absorb. Good news is I know which part I now need to replace. Blower motor module

[@rodneymccrea465]

The module was good all fuses was good again it was a resistor on this particular car easy fix.

[@DaveSender66]

Another great vid Paul!!! I'd like to thank you for helping me troubleshoot a friends crank no start. Your vid on GM fuel pump relay testing was key!! Thank you for the incredible good energy you spread through the universe my friend !!!!!!

[@ScannerDanner]

Thanks Dave!

[@davidyork751]

I know what happens, just figured it out with all of them, the blower motor shaft gets rusty and causes the bearing to rust and shaft then puts a lot of pressure on the motor and causes the resistor to burn out or just shut down the motor completely, I just fixed it by adding a little bit of 20 weight oil to the shop to turn the remove the blower and turn the blower upside down with a squirrel cage is facing down for a little bit of oil in there at a time and keep spinning it and spin until it comes free and all fixed, so there isn't a sealed bearing in there and the condensing from the air conditioner causes moisture and rust everything up.

[@giovannisantiago3001]

Very detailed and precise description. Awsome explanation. Ty!!

[@wysetech2000]

Very good instructional video, Paul. Well done by you and Caleb.

[@stephenmarshall5302]

Well done cailub. Sorry if wrong spelling. PAUL although this video is a fairly simple diagnosis I enjoyed it your the man. Keep it up

[@ScannerDanner]

Caleb :-) Thanks man

[@wyattoneable]

Great stuff Paul. I need reminders in electrical theory and these videos are doing just that.

[@Mista6I6]

great detailed video that help me determine what was actually whats wrong with my vehicle, thx

[@dassme1]

Yoo. What's up. Danner that noise you here is actually a mini fan up in the headliner that looks like a mini speaker/microphone . It is a fan that is all clogged with dust great vid danner !!!

[@ScannerDanner]

someone else said that too. Thank you! I'm sure I'll get to hear about it 20 more times :-) Such is the world I live in now. Seriously though, I do appreciate the correction.

[@Mako-sz4qr]

Nose hair as an indicator .... nice. Great vid bro .

[@Blazer02LS]

That's not the onstar speaker, that's the interior temperature sensor aspirator for the automatic control HVAC system. The noise is the little fan motor in it that's blocked with crud. It's a thermistor with a fan pulling interior air over it. One common symptom of it's failure is heat output stuck at 80+ degrees with no heat below that.

[@ScannerDanner]

ah great tip! Thank you

[@Blazer02LS]

If the fan is still working you can sometimes pop the grill off and hit them with some air and blow the fan clean enough that it will start working again. Easier than pulling the headliner down to get in there. Every GM truck with the automatic HVAC system has one.

[@SmittySmithsonite]

Ahh yeah - got the same noisy fan in mine too. Was just going to tell Paul about this. Of course, GM no longer makes the part if you need it! At least that's what I found last time I checked. Real nice of them to stop making parts on a vehicle that's barely 10 years old ...

[@Blazer02LS]

ACDelco 22834330 should let you find one. That fits 2000-2014 GM trucks that use the aspirator. It's the current replacement with the latest revisions.

[@SmittySmithsonite]

Thanks Blazer! I'll be writing that down on my maintenance folder. :)

[@richarddaggert2630]

Well for starters, that’s not the onstar speaker, that’s part of the climate control system, it uses a fan and a temp sensor to sample drivers seat temps to inform the auto hvac module

[@blockbertus]

Thanks, Caleb! :) Also, great video, Paul!

[@JeffBrown1966]

Sure you know by now but that is not OnStar making noise that you pointed to, it is a fan that measures cabin temp for the HVAC

[@ScannerDanner]

Haha yep, sure do. Thanks!

[@nhhicks9]

Great video gave me a better understanding of what im looking at 👍🏽

[@jamesmays6826]

Great video the impala is ground side switch like that one

[@mikeoneill7360]

Sorry Paul, I was confused, meant to say if it has power and ground, module/resister is probably bad, which is a very common issue on the GM fleet where fan speed is not working on all settings.

[@paulputnam2305]

Thanks Paul and Caleb

[@mostlymoparih5682]

My wife's 02 T&C had a low fan then no fan so I pulled the resistor or module and with a VOM I measured to see if there was an open or short. Back history, I had this happen on my T&C and so I know there are four pins that should have resistance reading on them. My wife's van had 2 pins with no resistance at all. So module or resistor is bad. But this was a deja vu so I knew where the Easter eggs were hidden. Now that I saw this I going to take that dew hickey apart and sea if I can see what you kneaded readers four4. Just kidding, gonna use a magnifying glass eye use readers two2. Great video professor and thanks.

[@joeleblanc7457]

Thanx brother Great video you just saved me a shit load of money

[@throttlebottle5906]

also at 7:58 you can tell it's not resistor for lack of wires in total, plus the gauge of other wires :)

[@ScannerDanner]

for sure

[@Automotive_Solutions]

Nice diagnosis. I refer to that style of resistor module as a 'hedgehog' here in the UK. Bit like a porcupine over there.

[@MangoSlade.]

Wow. Tapped it real hard and it came back on.

[@mporter6775]

The fins or poles are to detect the temperature as the air flows over them so it can be adjusted automatically when on auto not cooling fins.

[@ScannerDanner]

You sure about that? There is no feedback circuit from the blower module to the climate control panel. This blower module does no decision making on it's own as far as temperature of the air or blower speed.

[@MrBorntoroll]

Thanks for the video! Case studies are fun. GM managed to invent a complicated module for a simple job :D It could be just a single n-channel mosfet transistor, a beefy one, looking at power ground and pwm controll, but I didn't see PWM ground (must be very fast switching), at least the one that could be detected with verus scope.

[@ScannerDanner]

I don't think the ground was being controlled using a PWM principle , I had my scope set on a 6 mega sample screen and I definitely would have seen the pulses. The climate control module to blower motor control module signal was a PWM signal, but that was it. I misspoke in the video saying the blower itself was being controlled that way. It certainly looked like some type of stepped circuit where resistance was being added and subtracted. Not exactly sure how they were doing it to be honest.

[@mikehenderson2389]

Hey Dan I'm sure uv found out by now that the little thing in the headliner is not a mini speaker at all, but it is a little tiny squirrel-cage motor that draws ambient air into the cage which surrounds a little thermostat type sensor. Its part of the auto climate control system

[@ScannerDanner]

I have, thank you! Oh and my name is Paul Danner, thanks!

[@MikeSmith-wl1bz]

I had this problem with an 07 Silverado. When I unplugged the fan connection at the module and plugged back in it worked. Turned out to be the connection at the fan motor. It had heated the plug and deformed it. I replaced the wire to the motor and no more problem.

[@99rattle]

Hey paul , nice to see you working over top of your $2 scantool to remove module :) Nice vid as usual , very informative, keep um commin

[@scirby1]

Excellent knowledge... thanks. I'm having the same problem on my Denali.

[@MechanicTechnicianRepair]

Excellent. Diagnostic. Master. My. Respect. For. Yuo. I have. Question a technician. For. Yuo

[@ScannerDanner]

What's your question my friend?

[@liviudaniel5082]

NICE LESSON ,GOOD TEACHER !

[@markferraro5250]

great video SD I believe that the blower can also be load shedded on the smart charging system RVC thanks again

[@dannypena1218]

fantastic video

[@SteveRobReviews]

Nice one buddy , I almost wish you didn't unplug it - caused too many variables in my head. LOL Awesome camera work .

[@ScannerDanner]

Why? It's a circuit board that gets stressed by a lot of heat. Nothing wrong with the connector and it would not have continued to work indefinitely. If I had time, better eyes and a magnifying glass, I bet I could have visually shown the failure on that board. Thanks Steve!

[@camreed7073]

good video helped me out thank you

[@ozzstars_cars]

New module and shes blowing like a champ. Do they sell those at the mall? I need to buy my wife a present.

[@ScannerDanner]

lol

[@HomieHektor]

Beautifully edited and explained, what program do you guys use to edit and over lay the voltages on the screen? 🎥💨

[@ScannerDanner]

Cyberlink Power Director 15. If I could do it over, I would be using adobe premier. I just don't want to learn another program right now and this one serves it's purpose.

[@vitamulten1395]

Top notch vid. Was wondering if you are going to autopsy the module at some time?

[@chevelleman70]

Thank you so much for the great vid! You diagnosed my problem.

[@carslover3509]

What a great test and diagnostic thanks

[@murphytoadster9864]

Just started watching the video but my question is the rear passenger ac control switch. Not the front ceiling control for the rear. There is a little screen that has the ac and radio control buttons that the rear passengers can use. But my rear fan won't turn on. It was working one day and cut out , but started working again and then by the time I got home it stopped working for good

[@rrmech11]

Great job. Excellent briefing on inputs and outputs. See you later my friend.

[@dunkindunkers]

You are excellent, thank you

[@bioticvictuals4999]

Hey Paul, I see 3 comments with no answer...(also my question) What trouble shooting steps would you take if the moduel is NOT getting power? All fuses are good.

[@whitetiger8652]

Great information Paul!

[@ScannerDanner]

Thanks brother

[@SmittySmithsonite]

Thanks for another great vid Paul, and great camera work Caleb! Always good for me to see these vehicles on your channels, since I own a '07 Silverado. One day this part is pretty much guaranteed to fail on all of them. God knows my truck has had it's share of failures. Latest is monitors that won't run. Might be time for a t-stat replacement ... or something deeper. For now, running with the black "R" on the windshield (inspection stickers in MA: "R" = rejected: Black "R" = emissions, Red "R" = safety). Frankly I'm tired of spending money just to keep this pile "emissions legal" when it runs just fine. Only 5 more years until it's exempt ... if the engine makes it that long! Bad valvetrain components on these AFM 5.3's ... :(

[@karate353]

Scaner danner is the best

[@tonystrong2736]

Well done. Easily understood. thank you

[@juniormoreno400]

I have a 2002 Yukon Denali with the same problem

[@sisobesobeso5115]

nice video mr. paul

[@ScannerDanner]

Thank you for watching!

[@rontiemens2553]

Easier to test than a resistor bank, but I've had resistor banks last 300,000 miles.

[@aliokab6999]

It always great job Thanks & God bless

[@joopterwijn]

Thanks Caleb!

[@nicknicu1787]

Paul,I’ve been learning a lot from you! Thank you.

[@scramshem613]

Great video, easy to follow. I was able to replace mine in about 20 minutes. Except it didn’t fix my problem but I did notice that there was some blue stuff running out around the old one. Is there something else I need to do or could be another issue I don’t have a blower for heat or cool. Thanks so much .

[@ScannerDanner]

blue stuff as in corrosion on the terminals?

[@IMARBAN]

awesome video!!!!! loved it... well done

[@Pablo_Automotive]

Great video Paul, regards from Spain =)

[@JoelAutomotiveInaction]

I had a jaguar that had blower motor resister module I could not tested I only tested power and ground ok and than it had feed back and control, I energized the blower motor to check amps and brushes, was operating , how ever signal had 9 volts bias steady with no changes, and 0v on feed back, my issue was to know if the hvac control was the issue or the blower module because when commanding on blower motor speed I got not changes at all, so with test light even the led the voltage was dropped and no changes with command, so at this point we order one at the dealer $400.00 install it and now the blower works I get the scope and do my checks and the voltage was dropping but as analog style to 2.5 volt at high speed , and the feed back was going from low to high appositive than signal. hard to test this modules some time because according to flow chart the test was to check the signal and command blower motor from low to hig and verify voltage signal dropping if not replace hvac controller.but the blower motor module wasa the fix. thanks for showing excellent testing methods

[@ScannerDanner]

Module to module communication lines can be difficult to troubleshoot. Nice job on that one Joel!

[@sailorbob74133]

Have any video's on testing a traditional divider resistor? I've got one where the blower motor was already replaced by someone else, the fan works intermittently ( will cut out after a few hours of operation ) and there is a 200 - 300 ma parasitic draw on the A/C circuit...

[@pdady21]

Any idea why on a suburban manual rear ac blower, there is power to the blower, new resister, but when plugged in to the motor/load the power drops to zero?

[@chrishatfield4424]

you are awesome to learn from and very funny

[@ralfsautomotive]

HAHA You are correct about the expensive Scan Tool remark LOL. And to be truthful, that Verus Edge deserves the Garbage Can, by far the single most useless tool I own. Seems every time I am looking for a funktion it's not there. Sorry about the rant! it has been eating at me that the 4X more expensive SO don't have half the funktions my other brands do.

[@Wrenchlife604]

what scan tool do you recomend ? i got a otc genisys and its slow and clapped out

[@alphaomega687]

Glad I've just so happen to come across this video very informative and instructional what kind of scanner are u using just in case u already stated it and I missed it

[@todayintheshopbanksy5904]

Did this on a Citroen C4 recently, £158 uk for a new module !!

[@martyhart135]

How do I know if it’s the switch located up roof or fan actuator in the rear???

[@andrewk778]

Always interesting, professor.

[@5Dale65]

Great video as always Mr. Scannerdanner! Please keep 'em coming! Big thank you! Poland loves you! :)