Chevy Trailblazer: Electric Fan Clutch Failure

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In this video I have a look at a Chevy Trailblazer that is having some problems with the electronic viscous fan clutch. Seems like a silly design for a cooling fan but it is pretty easy to diagnose once you know how it works. -Enjoy!
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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.

Опубликовано:

6 сен 2024

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Комментарии : 498

@paulhunt598 5 лет назад

Eric, I'm teaching an electricity fundamentals class to a bunch homeschool boys. We are approaching understanding PWM, but I am frustrated that I can't design a good lab for theory reinforcement. I don't own an O scope. Your scope videos like this one are just what I need. I intend to pirate a video for my lab. I also intend to have the class view some of your videos to reinforce understanding the need for testing, validation, and absolute certainty before making the call and ordering the part. My students are 8-16, and I anticipate that possibly 3 of them will pursue electrical trouble shooting careers. Your real world trouble shooting is the spirit that I hope to convey to my students. I spent my career as an industrial electrician/mechanic. Training my coworkers and subordinates to become TROUBLESHOOTERS was a career long task. Our department had the highest respect in the plant, because when my technicians "made the call" no one challenged them. The correct part was condemned, repaired or replaced. I am retired and I no longer have to diagnose and turn wrenches (or supervise the crew that I trained) daily, but I enjoy taking the ride with you. I sometimes scream at my phone when you step out of the auto repair shop closer into "my" world and I know a better way. I never enjoyed working on cars, and you broaden my understanding of your world. You are a pro. You would have excelled in my world and I I would have enjoyed working with you if you had been one of my team members.

@marksmith6104 5 лет назад

Glad you posted. I was starting to get the shakes.

@ronringel9132 5 лет назад

Well said, Mark Smith... LOL

@williampayton9515 5 лет назад

Bunch of damn (video) addicts...............Haaaaa. My name is William, and I'm an addict. Welcome William to the meetings everyone..........LOL

@JackdeDuCoeur 5 лет назад

You did an EXCELLENT JOB teaching the theory of operation. What an overly and unnecessarily complex system to adjust fan speed - just give me an electric fan, thank you.

@NicholasAndre1 3 года назад

Until the motor 💩s itself and the OEM replacement is $1000.

@richardwells9738 3 года назад

So where is the speed sensor

@151bradhatt 3 года назад

@@richardwells9738 in the fan clutch

@saeedhossain6099 5 лет назад

Dude, I'm always so impressed with you and your content. You are really an electrical engineer who fixes cars meticulous!

@jaredstrehlein5605 5 лет назад

I agree He is good. He tries to eliminate the parts cannon.

@Paul1958R 5 лет назад

Image a toilet designed by modern automotive engineers: water level sensor, flush handle sensor, totally integrated flush control module (TIFTM - say 'tiftum'), water 'density' sensor, bowl level sensor, hall effect flapper valve sensor, overstuff bypass module, etc. Think about 'bi-directional' control. SMA#1 God bless Paul

@jeremyhanna3852 5 лет назад

Dont forget the seatbelts and airbags and paper level sensor and over wieght seat shut down valve

@eizzle78 5 лет назад

Don’t forget the square per wipe regulations!

@jeremyhanna3852 5 лет назад

@@eizzle78 that's government control not the seat and bowl institute

@josephwash109 5 лет назад

They'd also add a Courtesy Flush Timer Module and a Flush Volume Detection Module.

@jeremyhanna3852 5 лет назад

@@josephwash109 cant forget the solid state flush handle module

@benritchsmith 5 лет назад

You keep getting better. Experience is what makes you better. Better means happy customers in the end. And at the end of all your work is great satisfaction! Love the show and thank you for letting us be a part of it. Rock on.

@RichardSchletty Год назад

You have a friendly, easy-going demeanor that almost makes me believe that I understand complicated electrical circuits. Thanks for making the cryptic accessible! My sons and I are going to replace the clutch on my 2006 Chevy Trailblazer. It has been doing a full-on click, click, click for weeks. Presumably a bad clutch bearing.

@Mr.Highway 5 лет назад

I so enjoy your channel. Truly this is an educational experience ! on your channel I learn how to fix things on Scotty's channel I learned that the only car to own is his Celica and everything else I might as well own a bicycle thanks Eric O...👍

@chevychase3103 5 лет назад

Thanks Eric for taking your time to teach us your tricks! We know it takes up a lot of your time thanks again!

@tracycolorado 5 лет назад

thats why he has another employee to do the real work ;- ) . thanks EO , for thinking of Us

@eddiereichel9354 5 лет назад

You dont have to break your Trailblazer fan shroud to get the new fan in. But it helps.

@troyphillips8607 5 лет назад

GM junk

@chadharmon5716 5 лет назад

Troy Phillips Isuzu

@jasonbrown467 5 лет назад

after changing both of my trailblazers fan clutches many times i notched out the fan shroud with tin snips just around the upper radiator hose inlet/outlet thing.

@robertthrem3382 4 года назад

No hahahaloosen the shrol 2 bolts and pushtotheengine and pull it outfromthedriverside

@CubasAutomotive 5 лет назад

Right at the end, poor Eric got all choked up talking to the ppl! @15:09 lol. Good diag Eric!

@SteveP-vm1uc 5 лет назад

While everyone is complaining about CAFE, I want to remind you that before CAFE, we had shit in the air a mile thick. Cars got about 8 miles to the gallon average and any idiot could work on cars, or at least they thought so!! We changed out plugs and points almost as often as oil and engines didn't last 100K. Plus there would not have been a need to ever watch Eric as the points change videos would be incredibly boring. So show a bit of appreciation for having much cleaner air and cars getting much better mileage and engines lasting 2-3 times longer AND being able to watch Eric figure things out and fix them. I am at 122K on my F250 and still on the same old factory plugs. Hell, 99% of the truck is factory and still runs great.

@Bushougoma 5 лет назад

11:34 The bad clutch bearing is the likely cause for the gaps in the PWM waveform at high RPM due to the tone ring wobbling.

@Defofone 5 лет назад

Glue on a Nd magnet and call it a day

@ismarmeskovic 5 лет назад

Power of knowledge on how to utilize diagnostic equipment properly and how to analyze valuable data!Great one Eric!

@brianbrundage3116 5 лет назад

Im just wondering why gm did not choose to use dual electric fans. Perhaps more c f m can be obtained through mechanical. Great video Eric. Thank you for reading operation and explaining what is wrong. You would make a excellent vocational teacher

@Buc_Stops_Here 5 лет назад

I worked for GM as a consultant in the mid 2000s when there was a push to improve quality. At the time we recommended the simplification of electrical systems to improve the quality, and to gradually to increase the complexity so the quality could come along with it. We also instituted Kaizen process improvement to help with the data coming back from dealerships to fix and redesign every year problem areas. As a result of these two moves GM's quality has improved today although it still does not quite match Toyota. To answer your question, two fans at the time increased complexity and was not attempted. I believe it was added in the early 2010s.

@wyokaiju992 5 лет назад

@@Buc_Stops_Here I assume this only applied to GM branded, and not "child companies" such as Pontiac? The Fifth generation Grand AM uses dual electric fans, for example.

@Buc_Stops_Here 5 лет назад

@@wyokaiju992 The way our job was is we were assigned to specific divisions, and not the divisions you are thinking of. I was assigned to Allison Transmission for example, in Indianapolis (their headquarters). Counterparts were assigned at Saab first, their smallest division. Others were assigned to GM Powertrain. Last, some were assigned to Buick which is not that small, because of China (over a million cars sold annually there, about 250,000 in the USA). Those divisions we worked directly with. They took those learnings and applied it to the remaining divisions after the bankruptcy, so besides GM Powertrain, Pontiac never got the training.

@RussellBooth1977 5 лет назад

If the bearing for the viscous fan coupling has play in it,that may be causing the Hall sensor to throw out an erroneous reading as it can no longer maintain a clean square wave due to the fact the toothed wheel or whatever has started to flop around,so the signal ends up dirty,all broken up & garbled at higher RPMs !

@bookerol 5 лет назад

Not to mention hard on the water pump.

@voidisyinyangvoidisyinyang885 4 года назад

if the bearing is bad - could you still hot wire the 30/87 relay circuit to engage the fan clutch?

@voidisyinyangvoidisyinyang885 4 года назад

So you have to rev the engine to get the fan clutch to engage? What if it doesn't?

@randallorr3730 5 лет назад

The most likely reason the fan shroud is broken is because at one time someone removed the fan without removing it with the shroud. If you try to remove the fan without removing it with the shroud most of the time you will break the shroud and in rare cases break the fan. Its not that hard to remove them together and it will save some parts in the process. Really good breakdown on the sensor failure. These actually are a somewhat common failure on these vehicles.

@davidhoekje7842 5 лет назад

Good troubleshoot. That's a cool technology. Mechanically simple, using mostly information that's already in the ECU, and it improves efficiency and protects various systems, plus gives feedback of something is outside of temperature specifications. I'm impressed.

@TheObersalzburg 5 лет назад

Eric, great explanation. This system made me think of Scotty in one Star Trek movie, "The more complicated you make the plumbing, the easier it is to stop up the drain".

@AndyK.1 5 лет назад

Thanks for the explanation. My off-road truck has one and wondered exactly how it worked. They are a nice blend of old tech under electronic control.

@chrisholmes6311 5 лет назад

I’m a big fan of your explanations Eric 🇦🇺

@mikephelps8212 5 лет назад

Yeah, I sense he is a pretty good guy.

@walterk1221 5 лет назад

@@mikephelps8212 I assure you he is. I had occasion to get a bearing replaced a couple days ago. Fast, efficient, very reasonable price.

@roadkill5333 5 лет назад

@Chris Holmes: YOURE JOKING, RIGHT!! Guys like this make auto makers think that they need to make things even more complicated and asinine, to keep just anyone from being able to work on them!! You did notice the AMAZINGLY STUPIDLY OVERCOMPLICATED COOLING FAN SYSTEM, on this example of a vehicle?? There are actual rocket scientists, with a secondary back up career as a brain surgeon, with an actual cure for cancer, that were confused by this DUMBER THAN A SCREEN DOOR ON A SUBMARINE cooling fan system! A fan belt powered, hydro-viscous coupled, computer controlled, pulse width modulated thru a relay cooling fan, on a mid quality vehicle!! LAMBORGHINI IS LAUGHING!!

@ferrumignis 5 лет назад

@@roadkill5333 I'm guessing you struggled to understand this relatively simple control system then?

@MrPiimpslap 5 лет назад

@@roadkill5333 It makes sense, the engineers wanted more cooling, which mechanical fans are better at than electric, but didnt want the noise from having a severe-duty fan clutch or the slow warm-up at cold-engine startup, which kills emissions.

@richardcranium5839 5 лет назад

be glad they didnt add a variable pitch control and feedback to the blades on top of it. wait should i delete this? some engineer might think its a good idea.

@roadkill5333 5 лет назад

If the system you describe is ever used, and air traffic control isn't involved or the name LAMBORGHINI is not stuck on the outside, we will hold you personally responsible for all repair bills!! Lol

@Garth2011 5 лет назад

Then they'd have to determine what pitch to set it for when there is a failure in the control system> LOL

@jeremyhanna3852 5 лет назад

German cars have variable pitch cooling fan just like a variable pitch torque converter

@olspanner 5 лет назад

Careful what you wish for!

@mikewarman9910 5 лет назад

Variable vain turbochargers are a thing. Also the manufacturer I work for uses variable electric oil pumps, and water pumps.

@g.cooney6599 5 лет назад

Hi Eric! I have an somewhat unrelated scenario. A 2017 Mini comes in with a burning smell under the hood. Confirmed customer complaint for sure. There is definitely a burning (almost electrical ) smell. We removed the bumper etc. to get to things (thinking alternator). After running it on the lift for better part of the day the burning smell kept concentrating in different locations in the engine compartment. No visible burnt wires or components but a very concentrated smell by the valve cover. Did I mention this is a standard shift car (best theft deterrent ever!)? It turns out the driver has abused the clutch and when removing the slave cylinder we found friction material in the bell housing. This really smelled like something electrical! Like to see a scan tool find this one! All the Best, G.

@Carducci69 5 лет назад

I've never seen an engine bay this clean in a SMA video 📹

@IsshmanGarcia 2 года назад

Great video as usual. Per GM service info: The desired RPM vs the actual RPM will NOT always be identical. It states that as long as they are within 800 rpm of each other, that is normal. Also code for this diag would be P0526 Fan Speed Sensor Circuit.

@NOVASFARM Год назад

P1481

@SWMOWZ 5 лет назад

Just wanted to say thanks Eric i just did the axles and wheel hub assembly's on my 98 caravan with the big 3.3liter lol never done this before and your vids and advice helped me a lot keep grinding brother you're doing a hell of a job!!

@MrHotguy41 5 лет назад

Awesome video Eric thankyou well explained thankyou for taking time to make videos of your work. Have a good weekend from U.K.

@ThePracticalMechanic 5 лет назад

Those things come in shop all the time sounding like a jet engine when the fan clutch locks up. Main complaint from customer is reduced power and fuel mileage. Thanks for the explanation and the video Eric O.

@mecalpsha4473 5 лет назад

Because they replace it with one that is made overseas. The only one to buy is the OEM and/or behr and it is not a hard job. One can make tying their shoes into a complex mess.

@ThePracticalMechanic 5 лет назад

Mec Alpsha 👍🏻 Yup OE is the only way to go on these.

@mecalpsha4473 5 лет назад

@@ThePracticalMechanic I agree OE is the way to go.

@MrOnemanop 5 лет назад

I have a similar vehicle (2002 Envoy) with a newly "wandering" Temp. gage. I was just going to through a new thermostat into it (Tricky job, last time took me 2.5hrs.) But seeing this video makes me think there are processes beyond my ability to diagnose, so I'll go see a pro who can look at inputs such as these to truly discover what's going on. Thanks Eric!

@SimpleLife1971 5 лет назад

Eric, something tells me you were great with video games growing up! This gave you the electronic skills you have today! Superb Video!

@roadkill5333 5 лет назад

WHAT!! You kidding?? Eric's kids watched this video and said: MAN, THAT LOOKS COMPLICATED!! And we thought "PONG" was hard, when we were growing up!!

@fredhoffman1017 Год назад

Thank you for making this video. Could you be more specific in showing which wire or wires you had the test light hooked up to? Also why was the test light blinking? Thanks again.

@pyro323 5 лет назад

I just got my brakes fixed on my '05 cavalier. I had to go back and have them finish a brake job they started, I didn't have enough money to pay for the whole job. They replaced my shoes and rear drums and spliced into a good section of my brake line just to get me home. When I finally had enough to finish the brake job I took my car back to the shop and every time the shop went to bleed my brakes another brake line popped. I went in for just one brake line and ended up getting all my brake lines fixed for the price of just one. Thanks Mavis Discount Tire. I was in the waiting room for 7 hours, but I have brand new brakes now.

@unknownwelder6815 5 лет назад

Eric I'm from upstate South Carolina, just found your channel this week and I enjoy it. I stopped watching t.v. because its just crap, but this makes me smarter. I'm a welder and I love DIY and you do great explaining everything. P.S. rebuild the tractor! My grandpa had 4 farmall Tractors and I to appreciate them.

@delano62 5 лет назад

I'm glad my ceiling fan isn't that complicated.

@roadkill5333 5 лет назад

I'm glad my pacemaker isn't that complicated!! Brain surgery isn't that complicated!! Heck, women in general, aren't that complicated!! And who can figure women out?

@ismarmeskovic 5 лет назад

@@roadkill5333 lol ;D

@toysareforboys1 5 лет назад

Ohh, I like the highlight circle on the wiring diagrams! Not to cause you way more work, but when talking about where the wire run, would be cool if you could trace them "live" on the wiring diagram :)

@reecenewton3097 5 лет назад

We could have more 1940 movie effects, like windshield wiper fades, etc.

@j.cooper2246 5 лет назад

Bro.....just helped my brother in law do one of these on his 05 tb...he almost bought a dorman product, i said hell no...order one from rockauto instead.all good.thanks but your about a week late..however i really enjoy your v-jayo's..thanks so much.best to u and yours..happy wrenching boys and girls...

@rogerf3622 5 лет назад

Excellent diagnosis of a common problem with the 6-cyl 2000 Trailblazer. Expensive part too. But the fun part is disassembling the front end including pulling the radiator to replace it. I was hoping you found an easier way to replace it.

@ishmaelpatel893 5 лет назад

Roger F and the nut from fan to wpump is always rusted lol sawzall

@MegaDysart 5 лет назад

two m8 bolts threaded into the front to hold the clutch in while you pull the shroud, easy peasy. Took me less than an hour to finish a water pump job on these, doing the fan clutch isn't that bad. Stupid design though.

@ishmaelpatel893 5 лет назад

The big nut is probably seized bro. Find out.

@ishmaelpatel893 5 лет назад

A bad fan will destroy the water pump anyway lol

@ishmaelpatel893 5 лет назад

Centrifugal force

@erikjohnson2889 5 лет назад

Another viscous coupling! You totally hooked up the "non-serviceable" one for the Kia lady (a different part, but that was pretty cool).

@baxrok2. 5 лет назад

Not the failure I was expecting. Sweet diag sir. Thanks Dr. O!

@brendathornlimb7677 Год назад

Thank you very much!!!! You were very helpful. Mine has acted weird also. Be thr next step to get a new one. Thank you. Diagrams and all were very helpful. Thank you

@Dreccomel193 5 лет назад

Love it, thank you Mr. O for taking the time to make this video. I have been chasing this issue without the scanner without directional controls. 👍😊 Hey... my wire diagram say "Hot at all times" 😡 yours say "Hot on run/start" 🤔 and I paid 5 bucks to get it 😒.

@icesoft1 5 лет назад

Suspect the play in the fan bearing @5:50 is the tell that the speed sensor is the likely culprit (much like a wheel bearing and ABS speed sensor).

@flagmichael 5 лет назад

First rule of troubleshooting: make everything right, then see what problems remain.

@notchagrandpa8875 4 года назад

Eric's the man, if he can't diagnose your vehicle's problem, well chances are you don't have a vehicle.

@MAJorgy70 5 лет назад

I have a '05 TB and the viscous fan clutch went bad. The A/C wasn't staying cold/cool when at stop light. The fan speed wouldn't increase with engine RPMs with A/C on. I could actually hold onto the fan with the engine running. Yup, living on the wild side. 🤣 Thanks for showing there can be electrical side of it too.

@williegillie5712 5 лет назад

Same as the old fan clutch types except instead of using a simple temp sensing bi- metal spring to open the fluid reservoir and engage the clutch it uses inputs from transmission, AC, Hall effect and engine temp sensors for the computer to activate the clutch. Not sure why they needed to change the design. It seemed to work well. The only time the fan is really needed is when there is no air flow or when the vehicle is not in motion. I prefer the older style fan clutch. Much less that can go wrong. Nice job Eric

@PaulysAuto 5 лет назад

Great video Eric, thanks for showing the pulse width modulation command and the feedback signal on these fans. Very helpful, Hope you are doing well my friend!

@hugh007 5 лет назад

This is just to run the FAN? Sounds like an employment program for out of work GM engineers.

@tinkerwest 5 лет назад

Clear explanation of theory, operation and diagnosis. 🤓 👍 Do you recommend to your customer to change water pump when changing electric fan clutch as they both age similarly? 🤔

@paultomasetti5164 5 лет назад

Might as well throw a thermostat and temp sensor in as well on that model if it hasn’t been done

@williegillie5712 5 лет назад

Funny thing. I’ve heard that is the recommendation. At least when the water pump is changed the fan clutch should also be changed. They wear about the same.

@reecenewton3097 5 лет назад

@@williegillie5712 An out of balance fan can beat the water pump to death. It's one of those "while you're in there, you might as well..."

@big27man2009 5 лет назад

My 05 envoy with 115,000 miles is throwing a code for the fan as well. Gonna show this video to my mechanic and tell him if he can do it you can do it

@arthurfricchione8119 5 лет назад

Eric,so glad my vehicles are older and well maintained. All this new fangaled high tech computer driven stuff is a recipe for headaches. Good video explaining how the system works and what to expect on the scope? How do you like the new Vantage? Have a good weekend Artie 👍👍👍

@trezsr 5 лет назад

I have slop in my bearings, and my wife doesn't like it. Nice vid!

@richardwilkes2990 5 лет назад

hope you show the video of the replacement/fix. THx! Happy Friday.....go have a taco :)

@wyattoneable 5 лет назад

Your a great teacher of automotive diagnostics and repair. (I had to fix my sentence) :)

@roadkill5333 5 лет назад

Lol Wyatt, you should have "AMERICAN ENGLISH" (not a sponsor) sponsor you! You're officially the first person in history, to correct his own comment, (and even note it)! You win the Internet for today!! But, today only. I bet you made the internets KEYBOARD WARRIOR GRAMMAR PATROLS heads collectively explode!! We thought it was just an earthquake!! Hahahaha

@reecenewton3097 5 лет назад

@@roadkill5333 And yet, "you're" was missed!

@roadkill5333 5 лет назад

Did I mention, KEYBOARD WARRIOR GRAMMAR PATROL??

@reecenewton3097 5 лет назад

@@roadkill5333 Always on patrol. Like a carpenter looking for a bad miter. A plumber looking for leaks.

@roadkill5333 5 лет назад

And yet, the "comma" was missed!! Wat's theus wirld cumeng tu??

@cassiuspuckett8789 5 лет назад

Good video, but I am concerned about the loose bearing and that could throw off the hall effect switch. But either way, the fan clutch will need to be replaced, because it's all one unit in the fan clutch, and I don't think that it's rebuildable. Thanks for sharing....

@jkunderwood3291 5 лет назад

I feel like 300+° is a little late for the transmission

@zuestoots5176 5 лет назад

No kidding..

@mcf3778 5 лет назад

No doubt.. 210 is not even good

@jkunderwood3291 5 лет назад

South Main Auto Repair LLC no kidding! I’ve never seen above 200° and that’s about as hot as any should get safely.

@cecilleflowerfarm 5 лет назад

Those are really hard to change mine took me 2 hours well I’m 5 ft 2 woman!with the help of my son I got it done! When you first turn it on it’s gonna be really loud like jet engine and it will be quite in two minutes.speed sensor is junk change mine but didn’t work, I tried to fix it from fixing the instrument cluster but didn’t work so I just drive without it and still working after 3 years!

@NoWr2Run 5 лет назад

HOW TALL IS YOUR SON ?

@cecilleflowerfarm 5 лет назад

nowr2run 😂😂😂 let say taller than me!

@NoWr2Run 5 лет назад

OK, LMFAO.

@anthonyjcarolan3161 5 лет назад

I love ❤️ the SMA and fluid film test light 🏮 is so hilarious I can't wait for the next video 📷 #SMAFluidFilmTestLight

@barrywhitley2535 5 лет назад

Why do manufacturers have to make things so complicated. Surely a temperature switch wired in series with the fan would do the job just as well?

@jo300hn 5 лет назад

Wouldn't satisfy the other high speed fan demand criteria, that would be a very basic control system.

@ThePracticalMechanic 5 лет назад

I think it mostly comes down to power and fuel mileage. Keep the fan speed as low as possible and still performing the cooling needs or the engine. Also air conditioning gets a performance increases at idle if they ramp up the fan speed.

@NoWr2Run 5 лет назад

SO IT WORKS LIKE A REGULAR CLUTCH FAN ?

@yqwgjsg 5 лет назад

Seems like it might work if you attached the fan directly to the water pump shaft. Even with an old fashioned clutch fan it worked for decades without the need for sensors or scan tools and most importantly, computers.

@barrywhitley2535 5 лет назад

@@yqwgjsg I had a 1950 Ford Popular back in UK. The fan was mounted on the belt driven dynamo on the top of the engine and had no problems. Used to get a load of pleasure working on that car on a Saturday and Sunday. All the tools needed were an adjustable spanner, pair of pliers and a screw driver. Wonder what the scan tool would make of that!!!

@justinnelson8680 5 лет назад

RU-vid notification early in the morning? Gotta be SMA. It's gonna be a good day!

@christopherzube551 5 лет назад

Ahhh the dreaded fan clutch. I had so many problems with that as well. Ended up changing it to a thermal and sending pcm to a tuneshop to delete codes. No problems since. I do think that they used a fan clutch because the engine is all aluminum which gets hotter much faster than a regular engine with cast block with aluminum heads. However letting it reach 260 before full command in fan clutch is just absurd in my opinion

@mistermechanic2257 5 лет назад

I would just like to convert the damn thing to a bi-metal fan clutch like on my 2000 s10 with 4.3 v6. They attach to water pump similarly. or maybe remove it all to together and add an electric fan. any consequences to vehicle operation other than the check engine light?

@christopherzube551 5 лет назад

@@mistermechanic2257 you can buy a thermal fan clutch on rock auto. For years 2002 to 2007 used the electric viscous fan clutch. 2008 and 2009 used a thermal. You can buy a thermal for year 2009 and it will still work. You will have service engine soon light on but is still driveable. Then if I was you I would send the pcm to get tuned that can delete the dtc codes. Their is pcm4less and lime-swap.com. I did mine with lime-swap.com and love it. You can message him and does pretty well emailing back with answers to any questions you have. It's 100 bucks but well worth it

@willierepairone5389 5 лет назад

Your introduction is Awesome.... Enthusiastic, and a positive attitude..

@TheSiliconSoul 5 лет назад

8:47 Suggest remembering to blur or otherwise conceal names on customer keys...unless they already signed some type of waiver. Love your channel.

@jasonbrown467 5 лет назад

i have had two trailblazers for close to 11 years now and love them both., but they both always have problems with this fan setup. the last time i replaced them both i got the lifetime warranty fan from autobone about 3 years ago. anyways i did not have the tools to observe rpm, or the scope to monitor the square wave of the speed sensor., as you have but i know i have had problems with these fans for some time now. i have to replace them about once a year sometimes more.in each vehicle, i have gotten pretty fast at it lol .anyways. i read there was a gm service bulliten on these fans and gm recommends a pcm flash and a new redesigned fan for these vehicles but i not remember why, maybe to increase fan speed at low rpm to aid with ac system not cooling off fast enough? on to my symptoms that lead me to having to warranty swap these out: 1 if i let the vehicle sit and run for more than say 30 minutes or so the fan clutch starts making crazy squeaking and rattling sounds at the tale end of that fan clutches life span and i usually replace it the next day. 2 sometimes i notice the clutch will not engage and my ac stops blowing cold and engine temps rises. 3 sometimes i notice the clutch stays fulled engaged and it sounds like a turbo prop is under the hood. i know i should have went with oem. seems like both the oem and aftermarket design of these are bad. just my two cents. awesome video as usual. i wish i had a mechanic like you in my area, then i wouldnt have to worry about getting shafted while dealing with incompetence.

@robertthrem3382 4 года назад

Tell me if I unplug the fan should it be stuck in high. It's a new clutch fan the other had a bad bearing

@billyyoder8171 5 лет назад

Thank you Dr. O. Good job. Have a blessed and safe week. Keep up the Fan tastic work.

@michaelblacktree 5 лет назад

An electronically controlled clutch fan? Sounds like an automotive engineer had a "hold my beer" moment. 🙄

@loogue 5 лет назад

Or "hold my wine" if it's a French car 🤦🏼‍♂️

@brokemanfishing6413 5 лет назад

As the tech drank or while saying "obviously you don't wrench on your own shit"

@JackS425 5 лет назад

Michael dougherty I'm sure Chrysler was inspired by that design for the grand Cherokee

@tylermacconnell217 4 года назад

michael blacktree - very common on HD diesel pickups...they need a mechanical fan for max cooling. But I agree, this TrailBlazer doesn’t.

@garybrady8411 5 лет назад

A very timely video for me. my 2005 Dodge Ram 3500 has a very similar fan set up. I believe it is bad and it took out my A/C compressor. One of the inputs is from the A/C system and mine let the high side pressure blow all of the gas out the on the compressor relief valve. This will give me a chance to try out that ne Picoscope scope. Thanks for the information it will be a big help in my diagnostic plan and repair.

@lackeydehackey405 5 лет назад

Just like PWM on the HVAC blower only with a sensor instead of human and knob. BTW Eric, the sensor on that fan works like the one in the reformatted hard drive PC. 3 wires, 5V ground and a PWM output to see if the fan is working. Had to reprogram one when they changed fan models.

@1013redoak 5 лет назад

My local shotgun mechanics would have just changed the Fan Clutch with no testing at all! Your testing causes minimal comebacks at South Main Auto!

@ericcorse 5 лет назад

That was interesting and that last paragraph answered some question about the way my TB fan has always worked. I'd have to change the shroud otherwise I would slice my arm deeply and wide.

@todaywithbk 5 лет назад

Another fantastic diagnosis!!

@williamsmith716 4 года назад

After you replace the Electro hydraulic fan clutch assembly you have to update the PCM with new software for it. Do the reprogram. You have to do the reprogram

@voidisyinyangvoidisyinyang885 3 года назад

Exactly - I had two shops (one was the dealer) and NEITHER updated by PCM yet both put in a new fan clutch and both claimed the A/C was working fine. Nope.

@johnh8546 5 лет назад

Love the channel man. That seems like a massively overly overcomplicated system. Hey got to keep those GM dealerships in business.

@jonathangunnells2628 5 лет назад

Hey so I’ve had some shaking issues at certain speeds that’s pretty aggressive. I’ve been told that tired could be out of balance or that there is a defect in the tires or wheels. I had one mechanic lift on the back end get it up to about 65 mph and you could see some wobble in the wheel, however. I got under my truck before this mechanic looked at it and my drive shaft &slip yolk have a lot of movement up or down, almost an entire inch. This mechanic said no it’s nothing to worry about. I took it to another mechanic the following week and he picked up on the back end, and the slip yolk came out of the transfer case about a half an inch. I believe I have an issue with my transfer case or driveshaft/slipyolk. The tires and wheels are almost brand new, they were made the end of 2018 according to the date on the wheels. They prolly only have like 3000 miles on them. Yet the violent shaking persist. This is also after I installed a 4.75 inch lift and these wheels are 33x12.5. If you have any opinion or advice, would be greatly appreciated.

@TheCowgirlNiamh 5 лет назад

Fan bloody tastic Eric! 👍😂😂😂

@tracycolorado 5 лет назад

was the engine getting hot because of this problem , or just the money light was on . you the man . like the last part , if I can do it , you can do it , as he holds back the laughing ;- )

@roadkill5333 5 лет назад

Oh man!! This is like asking "what makes dog food taste so good"?

@johnv5211 Год назад

Had a problem with the connector for the fan clutch. Cleaned it up, zip tied it so it wouldnt move and it works.

@GooniesNeverSayDie1980 5 лет назад

That Chevy Trailblazer sounds awesome to be 16yrs old, no loud high-pitch pushrod or rocker clack....

@mikechiodetti6737 5 лет назад

Complicated. The wonderful world of electronics! Oh ya, mix in a sloppy bearing and oops! No bueno! Nice Work Mr. O!

@user-ch3dg2lz3x Год назад

My dude, first thank you, you have made my brain make the connection to the automobile electronic aspect, make sence ... IF THAT MASE SENCE! however, great explanation! Great job! And the " if I can do it, you can ! " love that shit ! .... I am a transmission shop tech, and I think you can make shit make sence to me on a different level than the men at my shop that work at ... I am subscribed and can not wait to binge watch everything you have put out!

@for2utube 5 лет назад

One of those times when an oscilloscope really helps/a necessity. I had a flaky hall-effect sensor once but no o-scope and it was very difficult to diagnose. When hot, would cause engine to stall/no restart, for about 2 minutes.

@QQTrick1QQ 4 года назад

Thanks Eric O, the right video at the right time for my situation,

@davidc4988 5 лет назад

Eric the Harry Potter of all things eclectic and auto related ! In short you know your stuff!

@chrislienau894 5 лет назад

No dorman, dongers, brake clean or even worse, Mrs O! Is the world as we know it ending?

@montestu5502 5 лет назад

Chevrolet meeting: “Ok guys, I want you to think of how to make a cooling fan the most complicated system you can think of for the new Trailblazer. We need it to have electrical, mechanical, and hydraulic features. The more complicated, the better. Get to it!”

@ThisIsReMarkable 5 лет назад

And it's said the Germans overcomplicate things! My 03 Jetta's cooling fan system is as follows- 1 large fan, 1 small fan, electric motor on each, ECM controlled. 🤷‍♂️

@Paul1958R 5 лет назад

Some guy at the meeting stands up and says' lets do it the way Mercedes does'.

@roadkill5333 5 лет назад

Isn't this the system that caused the "CHALLENGER" disaster? NASA sold this to GM, and they all laughed!!

@montestu5502 5 лет назад

Engineer says, “Can we add pneumatic valves to control the hydraulic fluid???” Boss says, “Now you’re thinking. However the compressed air for that should be produced by compressor driven off of the driveshaft, or the crankshaft. I’m open to anything more complicated though”.

@Guust_Flater 5 лет назад

Hey Eric, @0:48 you said "a default full on", but than the PWM signal from the PCM should be a continuous 12V, but it isn't !? I would think a safe mode would be that the clutch is default engaged and the PCM controls the OFF-time with a PWM signal, instead of ON-time. Then if somethings goes wrong (broken wires, broken PCM,......), the clutch would go to the default clutch-on state and the fan would run at full speed, protecting the car from overheating. Why didn't we see the orange testlamp full on, if the default was full on ? Nice video!! 👍😃

@albatross5466 Год назад

I understand the directives for better fuel mileage, but these engineers seem to get down a design rabbit hole. A viscous drive fan clutch by design is complex and expensive. The electric drive fans are much simpler, less expensive and more reliable. But certainly, kudos to Eric as usual.

@williamsmith716 5 лет назад

When I was working for Chevrolet at the dealer level, we saw so many of these coming in and the customers were complaining that it was a transmission issue . It sounded like a jet airplane thought that because of the fan noise would increase with the speed of the car, like direct drive, but we knew we had to put a new electric mechanical fan clutch assembly on it and also reprogram the PCM for the new fan clutch assembly. I believe there was a TSB on this.

@voidisyinyangvoidisyinyang885 4 года назад

I had a new fan clutch put it back in 2015 - and now it doesn't work again. Why do these fan clutches fail? thanks

@voidisyinyangvoidisyinyang885 4 года назад

OK I reread my records and reading the Trailvoy forum - turns out if you do NOT get the ECM/PCM update for HVAC then the new fan clutch will just go bad again! The dealer notes even stated - first they did a diagnostic and state, "updates available but not sure if they will improve performance" and then five days later we get the new fan clutch - and just says it's a GM fan clutch (compared to the different fan clutch a local shop had put in a week before). So they never did the software update!! And now the fan clutch is bad again. I don't think it lasted that long. I just got fed up - wondering why the AC never worked. NOW I know why!

@voidisyinyangvoidisyinyang885 4 года назад

So the service bulletin was cancelled - and so the technicians didn't update the HVAC even though that's what the service bulletin says to do!

@williamsmith716 4 года назад

What I work for Chevrolet, all of us there at that certain dealer they replace those clutches did the update. We did that because we didn't want it to come back and I have to do it again because we didn't reprogram. It's a very simple thing to reprogram. They did not do it either because they're lazy or they're uninformed about the problem with the clutch

@voidisyinyangvoidisyinyang885 4 года назад

@@williamsmith716 Glad you all did it! thanks for confirming that is why it failed again. Yes it's kind of an amazing detective story.

@heavysnow8616 5 лет назад

Ignore the gas guage, along with the power windows, seats, ect. Focus on complaint or you will never get the “real work” read as making money work done. Eric, close it down early as it’s ice cream Friday. Take the family with you-enjoy the weekend and relax a bit.

@julioluna1344 4 года назад

my 2002 trailblazer just got a new fan clutch 3 days ago, but it only kicks in when my temp gauge is at 3/4 then it comes back down, exactly just like the prior fanclutch, so im guessing is not the fan clutch at all, also , weird thing no trouble codes detected, but when it kicks in at 3/4 temp comes down fast, what could it be? what else can i test? new water pump, new fan clutch, clean radiator , the only thing I have not replaced is the coolant temp sensor

@KevinReinartz 5 лет назад

We had major issues with these at the dealer... Replace the clutch and reprogram the ecu...

@KevinReinartz 5 лет назад

Pro tip... Take the fan off of the clutch and you can sneak it thru without taking the shroud off... You'll cut your arms up though

@NoWr2Run 5 лет назад

OH ERIC YOU SUCH A FUNNY PERSON WITH THE TITLE OF THIS VID. TAKE IT BOTH WAYS OR NOT ? IT WAS A GOOD ONE, DIDN'T SUCK OR BLOW.

@jiffyjiff4509 5 лет назад

All I heard when looking a the wire diagram was I’m glad I don’t have your job.

@peacefrog0521 5 лет назад

"It was my understanding there would be no math..."

@eizzle78 5 лет назад

I hit with my hammer... it still doesn’t work. Sorry.

@fatjack840 3 года назад

Hi I got a 2003 blazer an I change the fan clutch every 6 months it goes out sometime my end side lights will flash 3 times when I'm in side sometime what u think. . Joe

@elcheapo5302 5 лет назад

Well done, Mr. O. When do we get to meet Jason?

@jaybeezy5429 5 лет назад

Nice title. Whitty you know. Great stuff. I watch from palmbeach florida. No cold here though ever. Iguanas all over

@dtgoodwin 5 лет назад

I had a 2002 that reached 200K miles before I sold it. The fan was definitely a weak link in an otherwise good vehicle. The theory was sound, but the clutches were a problem, especially in the first couple years of production.

@frankd.3985 5 лет назад

It's not just Chevy, my 6.0 L. Powerstroke has a very similiar system. I also think that the Chevy fan is spinning too fast when you have no energize signal. When the fan isn't needed they usually slow them down to almost nothing to save the energy wasted.

@DanChasingTheGlobe 2 года назад

The MIL code also might have been "P0495 Powertrain". I have a 2003 Trailblazer with this issue: "cooling fan stuck in high speed throwing P0495 no matter what the Chevy dealership service department tries to do." This issue is very frustrating. You'd think the brand's own dealership service department would be able to fix this issue. But so far, no luck there. And it is all luck at this time.

@quakerwacker1071 3 года назад

this is my go to guy defiantly has basic sense thanks for real\

@kellyconstenius676 5 лет назад

Wow about time for a Video. You dont need to wait until an interesting opportunity presents it self. Just record a brake job. We will watch it like sheeple. and still be happy. Just kidding... kinda... Good job on the fan.

@reecenewton3097 5 лет назад

Even if it's just a dissertation about rust, we'll be enthralled, Mr. O.