VW/Audi Fan Controller - Case Study

Being thorugh with your basics is something Chris Martino holds close to his heart.

In this video, Chris demonstrates how to accurately isolate the culprit of this "cooling fan stuck on" concern with this Audi.

Developing a repetitive and consistent diagnostic strategy to include all of the neccessary steps from A to Z, is a very important key to success for a diagnostician.

[cmichaelhoover]

Good to see someone who actually does diagnostics instead of just replacing parts in the hope that they get the right one. (At the Stealership they actually hope that they get the right one in the second or third try to maximize their profit.)

[weldingjunkie]

Great job Chris I never realized these modules malfunction so often. Thanks for sharing

[joshuacaldwell]

I’ve been working with these Audi fan controllers for awhile an your diagnosis sounds right. However it should be known that most of the Audi fan modules have an internal fail safe to run 100% if the pwm signal is missing.

[foodskewed]

Just attended the class you taught in Raleigh today on VW and Audi body electronics! Awesome class!!

[gollcartagenaesp]

Very good diagnostic, Chris, I have my A6 C6 with the same problem I suspect, Many thanks.

[billyyoder]

Thank you Chris. Good job. Have a blessed and safe week.

[nickayivor]

What do you call KNOWLEDGEABLE and SUBSTANTIAL the answer is
Trained by Techs
Thank you very much helpful tutorial video. God bless you All
Trained by Techs
From Nick Ayivor from London England UK 🇬🇧

[anthonybeaudry]

this is the kind of vids we are looking for out here. very well done Chris

[joserodriguez]

Great case study THANKS keep posting you'll have many followers.God bless you.

[Bigmeeup]

Great Video, way to keep it simple along with real excellent troubleshooting techniques

[stephenharvey]

great video have the same problem on 2002 golf you have saved me so much time and money

[barbualex]

Hello. Did you had any warning light on the cluster? For this fan problem

[tjj]

Good video. 2006 Audi A4 1.8T. After replacing the fan control module does anything need to be programed? Thank you

[bobsanders]

Hello Chris. You posted this video four years ago so you may not be monitoring the comments but....
I have a VW Golf Mk4 4Mo that I rally. I've had repeated issues with the FCM failing. I believe this is pretty common. I'm guessing that the connections on the PCB get broken or damaged and hey presto, no fans. The FCM is sealed so its not possible to open it up and check it. Do you know how I could put in a bypass switch so I can turn the fans on manually?

[Automotive_Solutions]

Great job. I like your approach to diagnosing this. 👍

[CubasAutomotive]

This look a lot like South Connecticut to me.... hmm🤔
😂😂😂

Really good, broken down diag. Made it all simplified!

[mcbuilder]

Well explained and very efficient testing. Excellent work to confirm problem. 👍

[billyyoder]

Thank you again TBT team. Fan control signal questions. Does the ECM deliver a 5 VDC pulse or 12 VDC pulse to the fan control module? Or, does the fan control module deliver a 5 Vref or 12 Vref to the ECM and the ECM toggles the voltage on off ground to create the digital PWM signal? Have a blessed and safe week to you and your families.

[PeterMilster]

Just diagnosed a 17 Golf with the same issue but module is mounted on rear of single fan. Had to order new fan to get module. Your testing is right on only issue is puncher end on tool for the wires destroys the insulation for copper wire that gets coroaded by salt if you are in an area were they use road salt for winter creating opens in harness. Better to use paper clip push in beside wire in plug to test circuit. Have a lot of electrical issues due to punctured casings on wiring harnesses due to testing tool punctures.

[MohamedShaheed]

Bro i have Audi TT 2.0 turbo 2008 model. After recent engine removal for gasket change, the coolant fan alwas on as soon as the ignition is on. I have changed coolant sensor as well still the issue not fixed. Let me know if you came across such issue and how to fix it.