We finally fix the high speed coolant fan issue on the Audi S3

We finally fix the high-speed fan issue on the car and you won't believe what the problem was.
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[@TheSjd001]

You legend. I can imagine you must have had a massive smile on your face when you solve that problem. Well done Paul. Great video.

[@CarsForPaul]

Thanks, and yes I did

[@carlosflores4380]

@@CarsForPaul Hi Paul when you had this issue was your check engine light on? Mine is doing this and the light is on

[@carlosflores4380]

@@CarsForPaul Also, is it dangerous to drive with this issue?

[@CarsForPaul]

@@carlosflores4380 mine didn’t have an engine light on so I suggest the light is for something else. I would strongly recommend you scan the engine for the codes so you can understand what the issue is.

[@YoAbzi]

I absolutely loved this episode, I was actually over the moon and happy that you finally resolved the fan issue. Without a shadow of a doubt your one the best youtuber out there, I love your content and I learn so much from you. 💚

[@CarsForPaul]

Glad you enjoyed it!

[@Rickbryant79]

So happy you've now resolved the issue. Keep up the good work, look forward to the next episode

[@CarsForPaul]

Thanks

[@madalinacristache2414]

We have a similar car and I have a really similar problem. I kidd you not, this video has opened my eyes. No dealership would have done all that work without charging thousands 😢

[@phuravhathu]

I’m happy that you sorted that out, also working on my S3 all the way in Cape Town 🇿🇦. Your videos have been very helpful, keep them coming.

[@CarsForPaul]

I will

[@Barryd57]

The broken wire is known as the signal wire. It's a PWM signal, Pulse Width Modulated. Instead of varying the voltage, the ECM varies the duty cycle or the length of time the voltage is supplied. You cannot accurately measure the voltage with a volt meter because a meter isn't fast enough to capture the peak and low point. U need a scope. When that signal wire is disconnected (or broken like your Audi) the fan module goes into emergency mode and runs at top speed. Eventually, the car goes to sleep and the other 12v signal is ended. Good job, you repaired it correctly. A dealer might have charged u to replace the harness which would have been expensive and if a new harness is no longer available, the dealer will try to sell u a new car.

[@CarsForPaul]

Indeed they would

[@abhijeetrode]

Hiiii!!! Perfect. This was exactly I found after watching your video. When i removed the radiator along with radiator support assembly, I forgot to unplug!! That pulled one of the wire and that’s why the fan was staying on. Thank you so much for taking this effort of sharing the knowledge. Keep posting such videos. Cheers

[@CarsForPaul]

Glad it helped

[@old_con]

That’s one thing I still haven’t got my head around, car electronics ! Good to see how you worked your way through it. Very helpful. 👍🏽😎

[@CarsForPaul]

Thanks 👍

[@David.Novohradsky]

Super insightful. Really enjoy you sharing how you went about solving the issue. Thanks 🎉

[@tg9507]

Great diagnostics work, and well explained. A good teacher. I have a 2.0 TDI A3. Where were you able to get access to digital Audi wiring diagrams? I desperately need this for my A3 8P. Thanks.

[@changmc4218]

Hi Paul, I have the similar issue, fans running at high speed but it happens only when the car is warmed up. I checked VCDS found the Fan speed (spec) is 0% but (actual) is 50%. I checked all temperature sensors, all looks fine. I will try to follow your video and see if it is the control wire issue. However one thing I am not sure is were is the actual fan speed readout comes from? Since seems no feedback signal from the fan control module to the ECU.

[@s2upid]

Did you find a solution for your issue yet? Same issue with mine. I've just been throwing progressively more expensive parts at mine without any luck

[@Love500]

Had me worried for a while that it was the ECU at fault. Good methodical diagnosis. Congratulations for sorting it.

[@CarsForPaul]

Thanks

[@drazen.tisljar]

Same problem with Passat b8 2015g 2.0 tdi, oxidized and broken signal wire 5 cm from the fan connection to the ecu, you saved me time and money, thank you very much for the great video!

[@CarsForPaul]

Glad it helped

[@SSteil]

Masterfully diagnosed! Thank you for sharing this and more importantly for your time and generosity. No off to diagnose my A3 with the continuous running cooling fan.

[@EinkOLED]

I appreciate you recording through this problem for us to watch.

[@CarsForPaul]

Your welcome

[@Pedr4m]

Thanks Paul. This helped me figure out the same issue with my S3. The purple wire came out of the connector when the shop was installing a new radiator.

[@deandax8453]

Hi Paul, have a similar problem with my A3 8v build. Fan does not come on but does so if i run it through vcds. Your videos have helped me thus far with my build. 💪💪

[@CarsForPaul]

Glad to help

[@MrGrimekid100]

Great work love how you explained the car electrics aswell keep up the good work

[@CarsForPaul]

Glad you liked it

[@CampingToRelax]

Just finishing watching the entire back catalogue of your channel lol found from NowWeDrive and finding things to watch. Really enjoyed it and keep up the good work, had your work cut out on this S3 though. I so want to buy an Fiesta ST and repair it from watching you and Spark Plug Steve haha

[@CarsForPaul]

Glad you like them!

[@NABZAA]

"Nothink" 😂😂😂 Paul you're a legend but you crack me up

[@CarsForPaul]

That's the Londoner in me 😀

[@AC-xw5tj]

Boom!! Nice one Paul. Looking forward to seeing the test drive.

[@CarsForPaul]

Coming soon!

[@markplenty2631]

Great Video, I’ve watched another video where someone had the exact same problem, I’ve shared your video with them, thanks very much for sharing! 👍

[@CarsForPaul]

Glad it helped

[@sylver989]

Great video.explained perfect.i have a 1.2 TDI just by turning ignition fan boost to Max.fan plug disconnected wires has GND 12V and Black/yellow 12V and Black/purple 3.55V if i connect fan plug Black/purple gives 9V i see that your (PWM wire) Black/purple after fixed gives you 0.5V. Can you give me some tips,in my case.Thanks

[@rantonasoavinaraoelson9503]

Very helpful video.. Same issue on my Mk5 tdi. Thank you

[@johnreeves2000]

very thorough and valuable video, great job and thank you for creating it.

[@CarsForPaul]

My pleasure!

[@briggsbriggs1363]

Hi Paul, great video. You are the only one I can find that has a similar issue to mine on my VW Golf. Hopefully you see this; I checked my pins and I am getting 12V 12V GND and 3V but my fan speeds up like a jet engine when plugged in and stays that way. I'm thinking fan controller in fan itself. But no idea how to test the controller. Thanks.

[@Bootneck-RMC]

So happy for you Paul and that you can now get the car ready for it's test drive, well done Sir.

[@CarsForPaul]

Thank you

[@otterkarman8740]

Well done and sorted. Enjoyed watching that very cool fix, more better than Colombo solving mystery on TV.

[@CarsForPaul]

Lol, thanks for that.

[@mohlomphimalatji6598]

Wow big thanks. Now i know where to start. Lots of love all the way from South Africa

[@funxyabednego5137]

voice is calm and comforting

[@manojmistry8302]

Genius! I need to run this type of diagnosis on my 2010 S4 B8

[@hydraflyer]

Keep up the videos you definitely deserve more subscribers👍

[@CarsForPaul]

Thanks

[@spartacus4715]

Great video Paul. My A6 has a very similar problem. I've eliminated temperature sensors and was thinking it was the fan module. Time to check the loom before splashing out on a new module. Thanks for the video!

[@raffykhan7800]

Hi, did you manage to resolve the issue ?

[@thegoatsofforex2914]

I have an audi a5 when you start the car fan run on a full speed none stop and inside my car the gauge that shows the temperature not moving at all and my fan seems like it is draining my battery since been having battery issues now help

[@djsiuk]

Awesome video. Learnt a few things on the diagnostics. Like it. Hope you can also get the head lights sorted.

[@CarsForPaul]

Thanks Simon

[@babelonchabalala1690]

Nice diagnostic.... I have polo gti with same problem.... But now car after clearing fault runs ohk but after while i lose ability to accelerate.... I will check that wire.... Maybe car going into Protection mode because of fan issue..... Always running with ignition on...... Now my question like in ur case, what if that wires are all good? .... Can it be the control module itself that packed up?

[@CarsForPaul]

if it was the module, it would likely show when doing a code read

[@paultaylor9652]

Lovely Jubbly, many people would have given up by now, well done Paul.

[@CarsForPaul]

Thanks

[@kenroper68]

Hi Paul very interesting. But my problem is I have a vw passat b5 2ltre petrol alt engine changed thermostat & all cencors but cooling fan not kicking in.wired fan direct and works perfectly any ideas.much appreciated.

[@danarehman6001]

Well explained , really enjoyed watching ,thank you .

[@CarsForPaul]

Glad you enjoyed it

[@SLRebuilt]

I hope mine is the same problem🤞 Great work Paul 👍🏼

[@CarsForPaul]

Thanks, check your sensors first

[@1232far]

I’ve got same issue

[@mattmpower5977]

Well done Paul , looking forward to the first road test !!

[@CarsForPaul]

Coming soon!

[@stevenjones19-m8i]

Hi Paul, great video,that solved the issue,it's nice to find the problem,can't wait for the first test drive of the Audi.

[@CarsForPaul]

You and me both!

[@Rob-eg8qc]

Great explained video. as soon as my wife gets in my car the ecu senses her 18 stone mass so due too extreme engine load it triggers the fan for extra cooling .

[@CarsForPaul]

Lol, I sure hope your wife doesn't what this vlog 😂😂😂

[@Rob-eg8qc]

lol . keep up the fantastic work with your channel

[@dord1954]

Good detection work, I’ve really enjoyed this project and I’m sure you’ll be able sort the headlight issue too, well done

[@CarsForPaul]

Thanks, I have some news on the headlights next week, stay tuned

[@dord1954]

Cars For Paul I wait patiently. I’m contemplating buying a damaged repairable Mercedes for my own use and wT hing these clips is building my confidence

[@CyclespeedTours]

Hi, I am having the same issue on a 2018 RS4, but it comes and goes. When it happens, fan is full blast and the engine temperature reading is all over the place (high, low, etc), but the oil temperature is fine. So no overheating. Any ideas?!

[@alexspence6895]

A fantastic journey sir on your s3 . Great content as per usual . Alex from Manchester 👍

[@CarsForPaul]

Glad you enjoyed it

[@vijaychampanaria7809]

Hi . I think I may be having the same problem,, my fan comes on around 95 degrees and I can’t turn the fan speed more than half way ,, after turning off the engine then back on again it’s okay for a few minutes, also not getting any warm air till the engine is about 90 + degrees Would it be the coolant auxiliary pump ?

[@waynelewis9498]

Fixed like pro your videos Are good and explained well keep the good videos coming 👍👍

[@CarsForPaul]

Glad you like them!

[@Millennial_Me]

I’m having this issue with my 2018 Mercedes glc300 coupe. It has always ran fine until a couple of weeks ago. I took it to Mercedes and there aren’t any fault codes and all of the sensors are working according to them. They said wait until a check engine light comes on because they can’t find anything wrong with my car other than the fan is stuck on high. They said the same thing it must be electrical but they can’t find where it’s coming from. Will this apply to the Mercedes glc300 as well?? I’m literally having the exact same issue….The fan in the front is running on high as soon as the key is turned to the on status. Maybe I can show the mechanic at Mercedes your video.

[@nikiflow29]

hello friend I have this same problem in a q7 3.6 fsi 2008 the same procedure is done

[@user-qq3oh1si5g]

Yes Paul a vid on where to source parts and finding out part numbers would be helpful as dealerships don’t give part numbers 🙁

[@CarsForPaul]

Great, thanks for the feedback

[@rendanimukhovha1567]

What a great work you did to this S3 .. Your good !!

[@CarsForPaul]

Thank you! Cheers!

[@ChandanaYapa-hq3ge]

Good job man , very good information thanks 👍

[@jonricketts2408]

Hi Paul yet another great video, nice bit of fault finding, in reply yes please show us how to trace part numbers and source spares etc thanks again most informative

[@CarsForPaul]

Will do

[@richardmounfield7822]

Great diagnosis and expanation. I thought I had found the fault at 10.39 when i saw the blue gremlin lol

[@CarsForPaul]

Thanks

[@jefferiespj1]

Nice one Paul glad you got it sorted 👍 totally lost me though 😁

[@CarsForPaul]

Thanks 👍

[@southcoastgroblerc6679]

Hi Paul, both my fans, cooling and aircon fan, does not come in at all. Can I connect it directly on the battery and control them manually via a toggle switch inside the car. Thus bypass the control unit? "Christo is my name and I am from Durban

[@randallnicely760]

Job well done paul let's hope the headlights won't be to much of a hassle 💯💯💯👍🏾

[@CarsForPaul]

Thanks Randall

[@tonyc2837]

Good job . Can tell you have great trade experience at fixing cars.👍

[@CarsForPaul]

Thanks 👍

[@manodounyayan8724]

Hey paul, i have the same issue on an audi s3 but in my case the fans turns in and off, when start the engine.

[@kenroper68]

Hi Paul got a vw passat changed all relays fuses cencors fan still won't run.any ideas.

[@antyirox3274]

Youre a Legend ❤️ i Finally found the Problem on my A5

[@lardy600]

Nice work. Hoq. Did you know thta should. 0.5 volts at it?

[@CarsForPaul]

Yes, thanks

[@grahamwalker9193]

Another great video Paul, keep them coming mate 👍

[@CarsForPaul]

Thanks

[@tshifhiwamuvhango5529]

Paul where did u connect ur red cable b4 u connect with purple one

[@tylerhellriegel1604]

Hey Paul I just had a quick question I’m having this same issue , say it’s the purple cable like you where did you initially run the red cable I know you connected it to the purple wire but where was it ran from

[@CarsForPaul]

It runs in the loom to the fuse box under the bonnet

[@LZDEN]

nicely done Paul..well done my friend.

[@CarsForPaul]

Thank you kindly

[@nicholasweitenberner7938]

Did you have a check engine light with the fan problem or just the code?

[@CarsForPaul]

Just a code

[@claywalker9064]

Hi Paul - Yes I would like to parts video please - also did you get the pressure tube that goes across the front of the car behind the bumper? Kind regards Clay.

[@CarsForPaul]

Will do, and no I haven't got the pressure tube yet.

[@abderrahmanegouasmi7556]

Great vidéo. You must have been a teacher before. Thank you.

[@abderrahmanegouasmi7556]

Good job. Keep doing nice work. Thanks 🙏

[@CarsForPaul]

Thank you, I will

[@antonikoumi6831]

i will look forward to any advise you can give on sourcing new and used parts

[@CarsForPaul]

Should be a good one

[@vinaybeniwal9505]

In vw polo tdi is fan speed can be low? In my car fan speed is slow it's an issue?

[@anthonykenny1120]

Great work Paul. Keep safe.. 👍👍

[@CarsForPaul]

Thanks, you too!

[@neilhibbert5201]

Great daig job paul on cooling fans.👍👊

[@CarsForPaul]

Thanks

[@michaelstevens7533]

I can feel the pressure being lifted in your voice

[@CarsForPaul]

Your right there

[@MrShongum]

Great diagnostic work

[@CarsForPaul]

Thanks 👍

[@fmalik2777]

With the main beam issue, it maybe to do with range control module and bcm requiring coding to the new headlights.

[@CarsForPaul]

I think I may have an answer, stay tuned for a update

[@stobsie]

S3 is coming along nicely.👍

[@CarsForPaul]

It is indeed

[@jasonbarry8104]

Hi there. I know your video is not recent but I am hoping you will be able to give me some advice. My control cable from the ECU is not constant as yours shown on the video. It fluctuates up and down. All wiring and pins in a good condition from ECU to plug but voltage does not stay consistent. When I put the scan tool in it says my map control sensor is -48°. Can this be the reason why my fans are not coming on?

[@CarsForPaul]

Hmm, it would appear so, something is feeding it the wrong info. most Audis have two temp sensors so one could be faulty.

[@jasonbarry8104]

@@CarsForPaul I will have a look. Thank you for your reply. Appreciate it 🙏

[@chubbyroyston3880]

So complicated you have a lot of patience I would have phoned a friend lol

[@CarsForPaul]

I almost did.

[@kadanoxby6458]

Have you changed the mileage on the odometer to what is on the new engine ?

[@CarsForPaul]

Nope, the mileage has to be the same as the chassis, not the engine

[@kadanoxby6458]

Cars For Paul thought that would be the case as if it had its first MOT it would be about 67,000 miles then drops to 35,000 miles it would look a bit suspicious. But thanks for getting back so quickly keep up with the great content and keep safe. Durham the North East of England if your wondering where I’m from.

[@hobzr6010]

Hi Paul where can I get wiring diagrams for cars.

[@diggey100]

Hey Paul, i have an audi a3 8v the 1.8tfsi version, and my fans are also running all the time.. i am also measuring 2.8v on the pwm wire. What can be the issue?

[@diggey100]

There are no faults recorded

[@thedivine9802]

Where is the red cable from?

[@craigclarke8596]

Great job again Paul 👍🏻

[@CarsForPaul]

Thanks

[@deanwood2332]

nicely worked out detective Paul

[@CarsForPaul]

Thanks

[@civictyper45]

Are you sure the headlights are the exact same as they may not be the matrix ones originally fitted to the car? I would check psrt numbers with original headlights of possible if not just code these in mate in adapations

[@CarsForPaul]

I have just discovered that they are not the correct one, my ones are adaptive LED's, the ones I have fitted are just LED light hence the error code.

[@civictyper45]

Cars For Paul thought so but you can change that from coding

[@JamesBond-hy4kv]

Great. Learnt a lot from you.

[@germancarfan]

Great job Paul you got to the bottom of it :)

[@CarsForPaul]

Thanks

[@mansdaz]

Well done Paul great video.

[@CarsForPaul]

Thanks

[@waynerountree9284]

Car looking mint great video thanks for sharing

[@CarsForPaul]

Your welcome

[@djieffe]

hi, most instructive video. i need help on this one. radiator fan never stop. ignition key removed: 11:11 power to fan 13v(left & right) power from ecu(top), 0v signal from ecu 0v ignition key on: power to fan 13v power from ecu(top) 12v signal from ecu 0.01v, looks low. sometime fan was still going on for few minutes after engine off. can mean power to fan with key removed is normal. continuity test on fan module(L&R spade), yes can i assume dead module? ----------------------------------------------------------------------- ignition key removed i have 2.5 amp draw from battery, slowly decreasing to 1.9 amp. is it normal a 2 amp draw with key removed? can a bad ecu kill the fan control module? (low signal 0.01v from ecu, power to fan with key removed and ~2 amp draw from battery looks high)

[@racingkingsiddu1]

My Audi s5 2018 fan is not working. I tried several new fans but none are working

[@xXHassan786Xx]

Hi Paul would you know what fuse I can tap on a Audi A3 68 plate, I am thinking of installing Ambient lighting and want to connect to Cigarette lighter by hard wiring, so when I turn the Ignition on they will come on too,

[@CarsForPaul]

I would probably tap onto the existing ambient lighting as you can get to this via the central console which pops out quite easily with some force

[@xXHassan786Xx]

Cars For Paul yeah could do, also found out that I can tap into fuse f40, as it power all the Cigarette lighter sockets in car, thanks for getting back to me Paul

[@DonnatellaMagma]

I wished you were in DRC!

[@isaacchirwa6436]

my a6 c6 2008 2.0TFSI was in an accident and after fixing, the radiator fan rans at full speed as long as the engine is running, any ideas on fixing this issue?

[@CarsForPaul]

check the fan regulator, common problem

[@isaacchirwa6436]

I bought a new fan regulator on ebay, but this one doesn't start the fan even when temperature gets to 100degrees celcius....is there a way of testing this regulator?

[@copartsoldpricesuk4841]

I really do like the Audi S3 It’s my wife’s car so it’s a bit small for me lol Keep up the great work

[@CarsForPaul]

Thanks

[@EinkOLED]

@@CarsForPaul What you meant is I really do like my wife's Audi S3.

[@mohlomphimalatji6598]

The problem with my Audi s3, the fan runs non stop as long as the enginerun(shuts down after 2 minutes when car off) then when driving sometimes picks high coolant temperature but my coolant is very cold. Pls help. I changed the temp sensor next to radiator. (All this happened after alternator change) Thank you

[@johnny5kmusic346]

Thank you!

[@HMC_LTD]

Thank you very much