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

[@DIYSEMI]

DIY SEMI, TRUCKING AND MORE • 59 seconds ago For great fuel discounts with no fuel card required, watch this video! kzbin.info/www/bejne/gpulZoxsZdVkp6s

[@PindtoAustraliatoAmerica]

Can you answer my questions which I mentioned in comment

[@JRich-kq6dc]

Good evening Sir I have a Detroit 12.7 470 horses going up mountains 40k plus truck always start over heating... Will manually turning it on stop truck from over heating? Everything else works great runs like a champ

[@JRich-kq6dc]

Turning Fan on 🤦🏾

[@mikedouglas8422]

@@JRich-kq6dc [oka

[@ClutchTrucker]

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

[@DIYSEMI]

Glad it helped!

[@CarolinaDreamerAutomotive]

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

[@seanmerisier1811]

Thanks bud, I tapped gently, all fixed, truck was parked for ten days near a dirt road 🙏🏾

[@Hawk-mk4kc]

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

[@charchri4]

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!!!

[@mikeshotshothauling9243]

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. ✌️

[@DIYSEMI]

Awesome

[@autotransportingwithdavidm3656]

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

[@magicstrucking2163]

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

[@shottava9314]

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

[@lennyhampton4045]

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

[@Truckingtowardsfreedom]

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.

[@ricogonzalez7508]

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

[@ilnitskiy21]

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

[@LauraBruno33]

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

[@DIYSEMI]

Thanks, you too!

[@DavidGarcia-rz9mn]

Thank you for your time to show us.

[@mrdannyproduction1234]

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

[@MedEvalMusic]

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.

[@reggaeriderr]

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

[@johnbenham6933]

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

[@DIYSEMI]

yes sir!

[@hectorjmendoza5973]

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

[@jamesball8519]

What was your issue

[@kirkknutson998]

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!!!

[@DIYSEMI]

Glad it helped

[@vetodrag3030]

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 :)

[@fredwallin815]

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

[@dustinmason4678]

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 !!

[@DIYSEMI]

cool

[@umairahmad9151]

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

[@nathanb5000]

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

[@CreatorEnd]

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

[@mannyflavia]

Thank you so much for your time to create this video

[@BuildItFixItDIY]

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.

[@MrAlsalazar]

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.

[@mikeh1593]

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

[@DIYSEMI]

bet that was expensive

[@mikeh1593]

About 2500.00 with tow bill and motel room and three down days. So yes it was

[@DIYSEMI]

ouch

[@tomh6598]

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

[@DIYSEMI]

when it's off the fan should cycle on its own. In the on position it should stay on

[@SeeMikesvideos]

saved our butts. you rock.

[@VAIkitiona]

Thank you. Helped so much on my truck

[@piccolochannel9713]

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

[@cic-jakevanddalgeemyers.2739]

You got yourself a new subscriber...

[@keithtorbert9929]

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

[@topshelf4176]

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

[@KT-il8vn]

Thanks for narrowing it done. Helps a lot

[@tbonepatti]

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.

[@maximilianocadena9635]

Good info, thanks, man.

[@natnaelmebrahtu8669]

Thank you sir it helps a lot.

[@elvinrosario5812]

Thanks . God bless you

[@satpalsidhu1236]

Thanks bro its very informative

[@raphael8454]

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.

[@dgdodgdo7091]

👍 buen video!! Very well explained...

[@cavalrytrucking813]

Helped me with my issue!!

[@carlt8976]

Great video

[@CarolinaDreamerAutomotive]

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.

[@robertovillalon2841]

Thank you!

[@willpowell5705]

Is the gray wire suppose to have voltage?

[@cubanito48]

Perfect video , thanks subscribed

[@JAMAICABOYY.]

Thanks for the video

[@garbagegut714]

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...

[@ስገምሃዘጋ]

Very helpful thank you very much.

[@robertrinaldi8748]

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.

[@sodbuster518able]

Got to be older than a 2012 model,no DEF on that model and 2008 and later Columbia was replaced by the Cascadi model,same with the Century Class.The only exception was later yr built Coranado model.Also later models had the DD15 replaced the 60 Series.

[@DIYSEMI]

It's a 2012 glider

[@curtisbarnes5895]

Good job.

[@lakwanwilliams4621]

I have a air leak on a fitting that’s connected behind the fan clutch and the belts connected to the fan. Can that be reason my fan is staying on?

[@DIYSEMI]

Yes could very well be

[@lakwanwilliams4621]

@@DIYSEMI I need help figuring out what fitting is called. Do y’all have a email or something I can send video of the fitting that’s leaking

[@toussaintlouverture9260]

Ty kindly for the game...

[@N1h1luss]

I got a 97 freightliner fld120 with a cummins m11 my fan wont turn off it did twice and started blowing out the over flow line of the reservoir ( i think the reservior was over filled ) my question is even with the fan blowing my temp should still be above 140-150 right? I replaced my thermostat and still have the same issue. Will the fan really keep my water temp down that low?

[@DIYSEMI]

in this cold weather yes

[@N1h1luss]

@DIYSEMI we haven't been running it for long but last year when we bought it the temp gauge still showed that same temp even in the summer ( I just wrote it off as a bad thermostat ) we just had it replaced and found out it is stuck closed wouldn't that cause it to run hotter? I also live in Florida it was about 55-60° here when we ran it after replacing the thermostat.Thanks for helping me BTW this has been racking my brain for the past few days! I

[@N1h1luss]

@DIYSEMI also I'm going to run through all your diagnostics tomorrow hopefully I can find out what's causing it to stay on!!

[@DIYSEMI]

did you verify the temp gauge is working, since it never changes?

[@N1h1luss]

@@DIYSEMI I am fairly certain the gauge is working as it should

[@lewisdiyprojects698]

Thanks... great information!

[@MalkitSingh-cw4ww]

Hi, I have a Freightliner Cascadia 2015. It’s hub fan gets stuck a lot and works sometimes but other times it doesn’t. The secondary air tank pressure drops and the fan keeps moving. This happens a lot what do you think is wrong?

[@DIYSEMI]

Sounds like you have an air leak somewhere

[@PindtoAustraliatoAmerica]

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

[@DIYSEMI]

any air leaks around the clutch? possible overcharge in refrigerant. at a certain point, once you adddress all the mechanical issues, it can be electronic and need to be hooked to a computer for eelctrical diagnostic

[@beauipox5496]

I have a 2014 frieghtliner coronado glider with the 12.7 detriot and I'm having an issue where the check engine light will come on and when it comes on the fan kicks on and won't shut off. Says oil temp is to high is my only fault code. There are times where I can run without it coming on for weeks and then sometimes it won't shut off for a few days. Very hit and miss. Any ideas?

[@DIYSEMI]

probably a bad oil temp sensor

[@beauipox5496]

I've replaced oil temp sensor coolant level sensor and oil pressure sensor

[@serega11116]

love your vids keep them coming :-)

[@DIYSEMI]

Thanks, will do!

[@gabrielreynoso4964]

Very good video

[@marcuswhite1403]

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?

[@khadardahir2657]

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

[@DIYSEMI]

possibly throttle position sensor

[@michaelbritton2331]

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

[@DIYSEMI]

if all the mechanical items seem to be working properly, it is possible it's an ecm issue. or a temp sensor might not be sending a good signal to let the ecm know to kick it in. just my first thought.

[@2_IMPERIO_7]

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.

[@DIYSEMI]

Check everything I mentioned in the video. If none of that works you will have to take it to a shop

[@axist1235]

Could a bad clutch makes my enngine lose power? When my ac on I hear the fan kick in hard and engine start shaking and lose power!

[@DIYSEMI]

yes, a bad fan clucth takes horsepower away from your engine

[@kimroyful]

I have a brand new silinoid and no air leaks but its still stuck and won't turn on less the engine is running...what's the next step ...I tap the hammer a few time but nothing happens just some dust coming from the fan

[@CooterELee]

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?

[@danielbrown8602]

Helped me out.

[@moebenjeddou782]

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

[@Me-ym6ji]

I did everything I’m getting 12v to my solenoid. But no air going to my fan clutch 😤

[@habtamutadese2953]

Hello can you please give me a suggestion i have 2007 Freightliner Century i have a problem the truck lose energy on a small hill and high coolant temperature light come on the radiator fan keep running ac turn worm can you tell me something???

[@DIYSEMI]

It sounds like your truck cant cool itself down. Start simple..do you think tne thermostats are opening? Have you made sure the radiator and ac condensor arent plugged with dirt and bugs so it can move air thru it? There could be several causes. Is your air filter badly plugged?. If you rule out all the little things first, then maybe you need a mechanic.

[@williambalda4962]

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

[@mohamudmohamud3056]

Hello can u please give me any idea i have issue on fan stays on i have replace the solenoid and and wen i replaced the high pressure sensor on the ac line it fixed the issue fan start working normal and after a week again have the same issue should i change the ac sensor again im confused 😒 HELP PLZ

[@DIYSEMI]

you may need to get it looked at. perhaps you a/c system has an overcharge

[@makincash3337]

Just liked and subd thank you for the video

[@nopanicrazzor5961]

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.

[@DIYSEMI]

time to have a shop plug into it then. Could be something in the ecm

[@raypenny9013]

I just subscribed thanks

[@DIYSEMI]

Thanks for subbing!

[@sebastiansantiago3552]

What would cause a squeaky sound when rpms get higher around 1400 I’ve noticed it’s only when my fan is on

[@DIYSEMI]

one of your belt pulley's or fan clutch...but it is probably the belt itself. start simple

[@sebastiansantiago3552]

I noticed my belts were squeaky and then one day they busted and I replaced them and it squeaked for about a week then went away. Then it started up again but only when I hit rpms closer to switching gears but doesn’t do it when I turn my fan off. I tested the air through the hose method today but didn’t hear any air leak.

[@MonkeyDust161]

09' 389 fan stays on. ECM and CECU parameters are good. I installed a fan kill switch but need the fan on otherwise a/c doesn't cool at idle.. Other than a wire problem somewhere that I haven't found, do you have a suggestion.?

[@DIYSEMI]

Have you had the a/c pressure tested to see if you are running high pressure? or if the high pressure switch is bad? that will cause the fan to stay on. the idea of killing the fan makes me a little nervous for various reasons. also have you checked the solenoid function?

[@MonkeyDust161]

@@DIYSEMI Had the a/c redone/tested at the dealer and supposedly the solenoid is functioning properly. Im down to looking for a bad wire somewhere now.

[@DIYSEMI]

@@MonkeyDust161 I guess check the plugs first

[@Bigola]

will this affect your mpg if its says on?

[@DIYSEMI]

Sure will

[@jasnijjar74]

Hi brother I have 2007 kw t600 my fan is on off and cold temperatures some time two days no work like look like no any problem some time all day running cold weather I change solenoid what same problem no leaks air to hub what you think please help I need to change temperature sensor or other key on fan clutch no spin what I change solenoid already same do with old solenoid

[@DIYSEMI]

I cant be sure about it just by this. It might be time to have a mechanic take a look at it. Maybe your ecm is telling it to go on and off. they could hook it to a computer.

[@jasnijjar74]

@@DIYSEMI today I open solenoid in go air ok out going to fan no air that mean solenoid bad right I change 3-4 months ago I think air compressor some oil thru hose maybe stuck solenoid

[@DIYSEMI]

Do you have the key on?

[@jasnijjar74]

@@DIYSEMI yes key on full air 120 psi I open first cab side to solenoid in air come then I open out going fan side hose nothing air

[@louishernandez2352]

My fan override switch not getting any power I circuit tested it and doesn’t light up. And my lo pressure switch is only reading 9 volts. I replaced all switches

[@Bloomamba94]

Mines only does it in cold whether

[@willieflores-tk1fw]

Hey i install a fan sensor my phone don't work I unplugged it works I put a face like you it was working now it's not working

[@Me-ym6ji]

I have no power going to the high pressure switch

[@andersonmontoya4969]

My fan clutch has a air leak would that keep it on all the time?

[@DIYSEMI]

absolutely yes

[@andersonmontoya4969]

Thank you

[@asmoov]

My fan doesn’t shut off when I unplugged the solenoid it just goes faster so I’m just baffled at this point any info would help thanks

[@DIYSEMI]

fan clutch probably stuck

[@sturgisboy3137]

My fan clutch getting air but still wont disengage

[@johnnylopez5744]

What if the fan stays on with the ac on, but stops working right after I turn off ac

[@DIYSEMI]

High pressure in tthe ac. Or bad high presssure sensor

[@Omosula]

Mine over heating going up hill freightliner columbia can you help please

[@DIYSEMI]

overheating can be caused by many different things..any other symptoms? just to start with the simplest things....is your fan coming on? thermostats opening? is the air filter clean and not clogged up? have you cleaned the radiator lately as well as the charge air cooler? are the fins full of dirt which would cause poor cooling? is the truck very old and many have a clogged up muffler full of soot? do you also have low power? which could mean a charge air cooler leak, which can also cause higher temperature. these are just simple quick things to check before spending a ton of money. I don't know anything about your truck, so it's hard to say what's happening.

[@mikeh1593]

When was the last time you cleaned the radiator and or taken the condenser and charged air cooler off and cleaned in between them. That will cause a huge air flow issue if it's all plugged up and not allowing air flow

[@mikeh1593]

Even just using a simple product like purple power and spraying it into the condenser, charge air and radiator will loosen up the dirt, dust and oil if you let is soak than take a garden hose or very low pressure water hose to wash it out. Don't just spray a degreaser into it and leave it. Once it dries out it can cause dirt to attract even quicker

[@Omosula]

It never runs hot I was coming from Arizona going to Missouri and that problem start on i17 going up hill fully loaded 76000lbs outside was about 110 degrees thanks for the help I will check all those parts

[@Omosula]

Not losing any power I went to pickup watermelon on the desert area I guess the dirty went all over the cooling system

[@axemurderbambi2995]

I’ve checked all that and mine still stays on. A/C is perfect, my fan kicks out when I turn the key off like it’s supposed to but as soon as I start the engine it kicks in. Even when it’s cold outside. Also changed the manual fan switch on the dash. Any suggestions?

[@DIYSEMI]

Might need to go on the computer if everything else checks out

[@MonkeyDust161]

Check the air line from solenoid to fan clutch it may have collapsed. check with shop air/rig air

[@axemurderbambi2995]

@@MonkeyDust161 when I turn the ignition off the fan kicks out. So that tells me the solenoid is putting air to it but when I start the engine it kicks back in. It’s gotta be in the ecm. I’ll get it figured out someday lol

[@ivanoliveros2950]

Good morning, I have a problem with my truck, the fan does not activate automatically, which could be, I already changed the ecm and it remains the same. help thanks

[@TheLeftRbabieskillers]

Good Job, clear and precise.