Engine fan stays on. Troubleshoot, diagnose engine fan on a semi truck. Fix an engine fan. 

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Great video! After paying a shop to diagnose a stuck fan on, I watched them slap on a new solenoid, then new high pressure switch and charge 2 hours of labor. They swore it was fixed... Didn't bother diagnosing the fan clutch with a vacuum guage or pressure test. 20 mins down the road fan was stuck on... I drove home and personally removed the fan clutch and hub from the engine bay. Not a hard of a job. I opened the fan clutch on a table and found the 20 cent o ring falling apart, not sealing air in. You couldn't hear it leak but it was enough to force the fan to run. Folks, tips in this video will save you hundreds of dollars in bad repair service bills and the frustration of trusting unskilled/ lazy mechanics with your truck.

Thanks Bubba.. you did a really good job explaining the entire operating mechanism of the fan.

Good job explaining this for semi truck drivers. Have a good week.

Just purchased a Columbia with this very problem. I will be checking all of the suggestions and really appreciate the in depth tutorial. Definitely subscribed

Thanks for taking the time to make this. Very helpful

Awesome video. Just this morning I noticed my fan was louder than usual so I realized it was stuck in the on position. After watching your video my diagnostic was a corroded broken wire at the solenoid. Thank you for your helpful video.

Love you video I learn a lot from your videos you are awesome especially when I open up my own authority I follow your step-by-step thank you

Thanks for narrowing it done. Helps a lot

Thanks for the help! On mine was the celenoid. Tapping gently and done.

Good Job, clear and precise.

Just gotta thank YOU for mentioning the stick clutch. I left my hood open over night and the fan was stuck in afterwards. I jumpered the airline at the switch so it had full truck air to the clutch all the time and with the engine off and air changed rapped it with a hammer and she let go. $450 and many hours saved! Thank YOU so much!!!

Thank you 🙏, You saved me time and money Volvo 2016. Bad solenoid.

Thank you so much for this video. You helped me diagnose my problem while I was sitting at a Walmart distribution center in Casa grande Arizona and was able to buy the part the next day. Got the solenoid and repaired it myself and now I’m back on the road with no trouble. Thanks so much I’m gonna be mentioning this and you in my next video on the clutch trucker channel. Thanks again

Thank you for your time to show us.

Thanks for the info! We have a 17 Per with Paccar mx13. Fan won’t turn off going to check everything you just mentioned and hopefully we get it fixed

Thank you so much for your time to create this video

This video saved a trip to the repair shop and untold headache. Testing the solenoid with the key on revealing air going to the fan but fan stuck in place. "Light" tapping 😅 loosened it right up

Thank you for making this video. I just fixed my problem by following your advice.

Man I love how you went over everything and explained it. Perfectly Thank you!!! I am have an issue right now, fan clutch keeps spinning, found out we need to charge AC no AC in the truck blowing. But I am going to go over all the things you talked about. I just subscribed to your channel :)

Thank you this video really saved me time and $ my truck had been sitting in a dirt lot for two months and the fan was stuck on wouldn’t move with key in on position, I tried your hammer trick and it popped sprayed oil around it cycled key on and off and now it functioning properly THANK YOU

Thank you. Helped so much on my truck

Good video. My ac compressor ironically just exploded as I was trying to figure out why my fan was stuck on .

Glad i found ur channel. I appreciate the DIY'r style.

Thank you so much for making this video. It helped me alot. I changed the fan clutch solenoid on my 2018 Freightliner Cascadia but the fan stilled stayed on. Then I tapped the clutch lighting with a hammer while ith key was on and it worked.

Thanks. I went on vacation and when I came back the fan kept running. I was troubleshooting the systems when I came across your video after I got stuck. I light tap on the clutch hub did the trick. Thank you

Great video. Lots of information you just got yourself a new subscriber. I’m going through this problem now. Thanks for all the info.

The clutch was stuck in my case too !! I smacked it with a hammer after changing solenoid and ac high pressure switch, and bam it released and rolled freely after I blew out with air hose was real dirty gravel lot also ! Thanks for video saved my butt !!

Thanks for the clear info. Just learning my truck and now know the solenoid I saw just today is actually for (fan solenoid). My fan is on when engine off and no pressure but also stays on when running and has pressure and when outdoor temp is low in winter. So, will diagnose as you described. Appreciate it.

Thank you for the information it's help a lot !!

Excellent explanation with good steady video. Thanks. Hope shops leave your fleet air filter alone. Sucks when a tech trashes it.

Subscribed you saved my butt 6nz cat checked solenoid ran power through it. Working now here’s where you come in I ran through a huge construction dust storm for miles. I said why not hammer time … I see dust welp didn’t work immediately but by end of day viola I give you full credit

Great video. I subscribed. My 2017 Cascadia sat on my concrete driveway for a month (my bad for not starting it once a week for 30 minutes) and yesterday when I took it for a ride I noticed the fan was on all the time. Watched your video, verified I had air going to it with the ignition switch on, no air leaking, so I tapped on the fan clutch last night,but it would not release. This morning I started up the truck and aired it up to the 140 psi max (last night it was 110-120 psi), shut truck off, turned ignition to the on position and tapped the fan clutch 8 to 10 times and it released. Whew!! Seems to be fine and I will be starting the truck at least once a week from now on. Thanks again. Be safe. ✌️

Very helpful thank you very much.

very informative thanks

Hey Adam, I just wanted to thank you for this video my van was staying on I troubleshoot it it just like you showed and it’s looking like it’s the high pressure switch for the AC when I turn off the AC the fan turns off the switch inside! Anyway thank you I appreciate the video keep making them!!!

Thanks... great information!

Helped me with my issue!!

Looking forward to that fan install vid.

Great explanations. I have a Maxforce so anything you can say to compare if you know would be great. Still what your doing applies to all situations. Thanks.

Good info, thanks, man.

Thanks . God bless you

Thanks bro its very informative

Perfectly explained.

Good video and narration. I subscribed your channel only because of the way you requested at the start of this video.

Great video

Thank you sir it helps a lot.

Great video I fixed my problem

Good job.

Thanks for the video

Perfect video , thanks subscribed

👍 buen video!! Very well explained...

Thanks for the info. Mine were loose cable wires to the solenoid.

Thank you!

Good in-depth tutorial! I'm having an issue with my own engine fan at the moment. I'll be using this to try to diagnose and see if I can't find the issue. Got sub out of me.

saved our butts. you rock.

You got yourself a new subscriber...

Bro, you are a fucking legend! This video may have saved me hundreds, maybe a thousand dollars in labor and parts. Solenoid was loose and dirty. Cleaned it with Duster, problem solved.

Thanks alot sir you saved me 900$ my clutch fan all it need it was a little hit with the hammer

Thank You.

I love the video

Helped me out.

Turns out our was on because of sitting in the dusty lot. I’d lead with that. Hammer worked.

Thanks for sharing

Thank you😊

Thanks sr

Very good video

love your vids keep them coming :-)

Have done video on adapting the on and off switch?

That was really helpful, but my default position is on and my fan freewheels even with the airline disconnected. But I'm not convinced the clutch is bad. Any opinions would be appreciated.

Ty kindly for the game...

Just liked and subd thank you for the video

Hello Adam thank you so much for the video I have 2016 freightliner cascades had an issue with the A/C took it to 3 shops already nothing is fixed Dan clutch stays on and it had a high pressure switch code replaced it but still the fan clutch is on could you see if you can shade some light on this issue for me . Thanks

The hammer tricked worked for me after replacing numerous parts,I had to re watch a couple of times.dont forget to have air pressure and engine on not running

Great vid....my truck started making a high wind noise while driving. Could it be the fan clutch? The mechanic says I need to change the fan clutch solenoid....but he said the clutch itself is fine. I just wasn't sure if thats the reason for the high wind sound. But what I did notice when he checked and tried to spin the fan by hand....it didn't spin. But he did do air pressure test.....and his suggestion was getting solenoid replaced....it's a 2012 cascadia dd15

Will the fan clutch Solenoid effect the regen process

Some trucks like paccar may have two high pressure ac switches. One thing with Cummins isx if the fan clutch is bad it will stay in the on position. Also if the clutch is thin enough it can separate and now you have a clutch, fan and radiator to replace. I had the clutch fail in that fashion on my isx

2013 Clark diesel 12.7 glider like this one. Fan stays on about 30 minutes and then releases. Today the fan hub is leaking air when it’s not released key on (I tried tapping with hammer) but when I bypass the solenoid by connecting supply air directly it releases and doesn’t leak. This is a new solenoid. A bad solenoid or do I need to rebuild fan? Can I get by with just cleaning and o ring kit or do I need to do a full rebuild?

2013 cascadia spn 647 fmi 5 how do i know if its the solenoid or the fan cluth ?

Adam I have an 03 columbia the fan clutch won't come on automatically.i have to turn on fan manually.i changed the solenoid

My fan keep ls turning on automatically often even when it shouldnt! It makes a heavier noise than when the fan is activated aswell. Kind of grinding vibrating sound. I can turn it off after I turn it off manually and then turn it off. It stays off for a while sometimes it come back up right away. I tried changing the coolant temp sensor and still going. Mechanic checked for air leaks nothing. What do you think it could be? Its also comsuming more fuel. 😫 2006 CAT C13 on Kenworth T800.

This freightliner I’m driving has an engine fan switch in the cab should it be on or off?

On a 2012 Freightliner M2. Once my fan engages, it stays on. It does it even when the A/C is off. That wouldn't have anything to do with the high pressure switch would it?

I just subscribed thanks

Good day, I have a 2009 Columbia with a DDEC 6. I by passed the ground wire to the air solenoid and the fan works like it should. Do you know where the ground wire from the solenoid goes to? I believe it goes to the ECM but I’m not sure. How would you suggest I fix this issue with the ground wire?

i have freightliner Columbia but my fan says on i changed the solenoid and ac switch and i have no air leak and fan clutch did not get stuck i have checked everything you mention on your video but my fan stays on the second thing i have is i don't have cruise control when iam driving but when i am parked i have cruise control i changed clutch switch and cruise control switch but still i have the same issue

Is the gray wire suppose to have voltage?

Hello sir I have 2000 freightliner Classic xl , with 60 Detroit 12.7 motor, And I replaced new fan clutch, and solenoid, and Ac high pressure switch . But fan still runs on even engine is cold. Any suggestion , could be relay? Or something else. I noticed when I turn ac on ac compressor turn on off but, ac working. And I liked your videos and subscribed. Thank you

My fan is always running when I drive down the freeway, and my ac stopped working, and the mil light is on. I hope it’s just the high pressure switch. Great video

What about if is leaking air i hear whistle coming out top of the clutch do I have to replace the whole clutch

2009 century fan clutch is ok,when I chang the high pressure censor fun clutch kick in,what the problem?

Yeah I just replaced my fan clutch and hub worked fine for 3 days no fan won’t disengage can’t spin the blades probably the selenoid

Hey man ,I have a 2015 cummins isx on an international9900i, I replaced the temp sensor, ac high pressure switch but still the fan comes on at 180 temp. Please help . Thanks for your video

My truck kw 2011 the ac and engine fan works like it should be on first fan speed,second third and fourth speed engine fan engage very often, even in the freeway going 65 miles,? Any advice thanks

I had cruise control issue i have freightliner columbia Detroit 07 when iam parked my cruise control is working but when I drive I don't have any cruise control set what would you think the issue is

Yesterday I was driving home, too, turned on, fan clutch and started working. I thought maybe the solenoid needs to be replaced. I changed a new one. but still on I came home. And was about change clutch But then I started to check, the wiring found frayed wire under starter and it was all a problem. started working properly.

Hey DIY SEMI, I have a 2009 Columbia and I have a problem with it. The heater, the wipers, the mirror heaters and the radio stopped working all at once. You have any idea what the problem could be or what should I check? Thank you..

I have the Detroit D15 and some pressure is building up in the cooling system that pushes coolant out of the surge tank. Engine's fan looks OK. What could cause that problem?

i have a 2017 cascadia and ive tested the clutch, the solenoid and replaced the high pressure switch and ohmd out the wires from the MCM to the solenoid and my fan still wont turn off. what do you recommend i check.

Having an issue with my volvo, changed the solenoid and tapped the clutch and fan still turns, but with key on and engine off the fan doesn't freely spin...