Bizar! New Volkswagen Airconditioning not working from factory! 

Check out my website ; www.diagnosedan.com For DDTSB visit ddtsb.com For the Topdon tool used in the video: US: www.topdon.us UK: www.diagnosticconnections.co.uk/ EU: eu.topdon.com

When Dan uploads you know its going to be a good video. 👍

Dan is now a VW field engineer. Next year he will be Senior VP of QA

The only problem with this channel is ? you don’t get enough blogs quite often but when it comes, you know it’s full of gold and diamonds.Thank you for sharing your skills and experience.

The bloopers are always funny, BUT the big thing I get from it . . . I really appreciate you taking the time to make the English videos!!! I get so much from them. Thanks Dan!

Dan is now the Head of quality control in Volkswagen

U are the KING when u want to buy a new car at the dealership, but when U want service....even under waranty....U are a simple peasant...and goodluck to you.

Customer - " Hello, I was in before with an AC problem and you could not find the problem, it is still not working. When can I bring it back?" Service writer to mechanic- " It's that guy with the AC problem, he wants to bring it back" Mechanic-" Oh No- tell him we are booked up for months"

Dan is an inspiration to anyone who has an interest in fault diagnosis. I spent my career working on commercial heating systems and trouble shooting systems installed by others, its the most rewarding thing to do.

I'm smiling all the time when you tell us: Let "US" diagnose it "TOGETHER". Yeah, I was working real had ... watching you. 😂 Thank you for another diagnose lesson. Regards from Belgium

Dan, you are the best mechanic here on RU-vid. In my opinion, you are constantly solving any problem. I enjoy all your videos

Dan you are genius, you can even find a hidden ghost in the car with your closed eyes,,,,well done

I saw that bad connector the first time you back probed and the system started working. I’ve seen those intermittent connector issues often, but rarely in a new vehicle. But it happens. Good job Dan. As always, you fixed it again!

When you know and understand how an electrical and mechanical circuit works, it makes it easier to troubleshoot. Most intermitten problems, my last test is to shake, twist and gently pull on wires. Good job Dan 👌we fixed it together again. 😁

Yes! A new video. Man I would love to work for someone like you, Dan, you're a credit to tour field.

thanks for bringing us along and not giving up and trashing the footage, I know all too well how hard it is to try and keep going while creating something decent to share so others can learn and benefit. Thanks for the efforts once again and nice find!

I have changed a few of those control valves already with great success saving the customer a ton of money. Thank you Dan

Always remember to check the basic . Don't jump ahead. Thanks Dan this video help me to remind myself to always check the basic stuff first.

About half a year ago I got a two year old Peugeot 5008 to fix an intermittant AC problem. It was cooling the cabin just fine when driving but it wasnt working while the car is moving slowly in a congested city traffic. The problem was, of course, that the radiator fan was not working. But there were no faults on the fan, and no faults at all in ECU, BSI and AC modules. It was running the Fan test just fine, also the fan was working perfectly, when the engine coolant got too hot. But when you turn on the AC, the compressor clutch engages, pressure valve gets controlled, pressure rises up and as the fan doesnt engage, it overheats, reaches overpressure and the clutch disengages until after a few minutes it cools down a bit, the pressure falls down to acceptable and the cycle continues. The problem was found after a long and torturous diagnose to be in a software of a BSI module, which is a central control unit of a whole car (Peugeot/Citroen branded). It is not in any way responsible for the control of the fan, but it is responsible for gathering some of the information for AC module and it also kinda connects the AC module with the engine ECU, that controls the fan speed. Somewhere in between that request for the fan was being lost. It was either: 1. Made this way and left the dealer completely new with a software or a module configuration bug. 2. I found in the module identification data, that the current software release date was newer than the manufacture date of the car. So the soft was probably updated at the dealer, when the owner went for oil/service/inspection. The date of the last diagnose in the diagnose history was a winter month, so it probably went unnoticed for a pretty long time, as the AC was not actually needed in winter and on spring it only helps to demist the windshield faster. So it may be unnoticed too. It was fixed by updating the software of a ECU module and BSI module. Factually, I wasnt really sure it would help, I just tried it as it was kinda last resort as everything else was already tried. Luckilly, PSA (Stellantis) still gives the ability for independent garages to access the software updates.

Your videos are so therapeutic. Keep up the good work!

Certanly the best diagnostician that I have ever seen on RU-vid. It is a pleasure watching you chase these pesky problems. Cheers form Slovenia :)

I wish i was half as good as you with auto electrics Dan! Keep the videos coming. I love them all.And learning at the same time.👍🏻👍🏻👍🏻

Interesting diagnosis and resolution of the fault. Thanks Dan as always.

Woow, with that clutch kicked in, I really thought the AC pump had an inner mechanical failure. Again a good lesson Dan, thanks!

Great vid, Dan :) I am a little disappointed that the dealer couldnt find a fairly common factory fault, that they didnt even have to dig for. Ive probably seen this more on VW/Audi than anything else, here in Canada. Thanks, again!

Great video; like watching your thought process and approach to fault finding.

Love the bloopers Dan ! ... but I always come 'a running when I see your videos post ! ... thanks for the great DIAG jon o in idaho

love those bloopers 😋...the video itself really has been an eye opener...."recognize the pattern" I would call it 👍

1. Two months till an appt? I don’t need AC the dealer has already frosted me! 2. Intermittent is real world thanks for seeing it through! 3. Seeing no pressure change I would have mistakenly swapped the compressor. Great advice mechanical problems don’t fix themselves!

Would hate to think how much parts the dealer would have changed before they sent to an indy garage.😂😂.keep up the good work, Ted.👍

I was sitting on the edge of my seat when you said the first step was to drain and refill the system😬😬😬😬With intermittent problems I usually try to do as little as possible so the problem doesn’t disappear before I see it. Good one Dan! The only thing I would have done more would be to test the pin drag on each of those pins in the connector to make sure they weren’t loose from a bad assembly procedure at the factory

Thank you Dan. Im always learning something. About 1 1/2 years ago, i ran into a similar situation with my sisters Sonata. She was quoted $3,000.00 to fix the system. Just like you did. I went step by step. I was stumped as to why the ac system was not working. Just like the VW ac Kornpressor. The ac clutch was working. Until i found the regulating valve issues. I ordered a new One. Pumped the system down. Replaced the valve. Cost $25.00 plus shipping. Plus the new refrigerant. System worked as it should. She drove it home and not anymore problems. And another as ac system problems with my daughter Toyota sienna. Ac didnt have any issues. On the way to work, they had an accident. Car got fixed. Then ac system issues developed. Since it was accident related, she took the car to a shop for diagnose and repairs. Shop said, bad ac compressor. They replaced it. Ran good for a while then intermittent ac system. Got cool for a bit and then no ac. Off and on. The shop wouldn't warranty the work. They wanted to replace the ac compressor again. So i took over the diagnosis. No codes at all. I downloaded wiring diagrams and read the system description. After i read the description, i asked my daughter, what does the temperature display for outside temp ?? She said its reading below freezing? I got curious. I found during the repairs. The shop had twisted the wires and just added black tape. And left it hanging. The sensor is located in front of the radiator. I admit i did buy a radiator cooling fan module. This was out of haste because, this issue was in the middle of summer and my daughter was on a trip. I ordered a new pigtail and repaired the connection using solder. Note: If the ambient air temp starts to drop and goes below freezing. This will shut down the ac compressor. Because of the bad previous repairs, the ambient air temp would work intermittently. Then the compressor would work.

Typical V.W. low quality vehicles needs a non-typical car mechanic. Another outstanding diagnosis. You are the gem of the auto industry ! 👍

Patience.....its so valuable.

Brilliant fault finding! Thanks for all your patience doing this job & great video!!!

I'm lucky. My 2016 VW Golf MK7 1.8t is almost 9 years old and I have had zero mechanical failures so far. I'm running a stage one tune and even the stock clutch is holding the increased power.

❤ regards from Athens Greece..😊

Common sense isn't very common......! Always enjoyable and entertaining. Thank you for your patient, step by step analysis. No need to ever bother going to the dealer. Having you explain these things is golden....! Professor Dan is the Man...

Very patient and skilled 🥰

Diagnose Dan did it again🙂 Those sort of faults can be infuriating to find, my wife's 2015 Subaru WRX had an intermittent AC fault and the dealer couldn't fix it after 3 separate visits, I did a Google search and found that there was a "known" fault with compressor clutches, too much air gap in the clutch fixed by undoing one 10mm bolt then removing the outer part of the clutch, remove a shim then refit, once the air gap was to spec the AC worked perfectly, it was a less than 10 min job requiring no parts yet the dealer couldn't fix it because they said that it always worked when they tested it.

German products are getting cheaper and cheaper. Capital wants more returns in Germany too

A simple little connection and no A/C. Good one Dan.

Great video as always thank you for all the knowledge being shared with us. I was working on the golf8 project sometime ago and I wasn’t expecting to see that car in your videos anytime soon ha ha.😂

Dan, excellent diagnosis. Great job.

yet another excellent bit of investigative diagnosis! Dan fixed it again!

Looking good Dan - and congrats on a difficult fix. You fooled me badly with this one - was betting the compressor was bad, which shows how little I really know about A/C stuff.

“Now it’s new new.” Nice! Nice! Dan! Dan! (Love your work! Best wishes from Florida.

Hi sir,I did work at a Volkswagen dealer in the 90's a new Volkswagen Passant arrived from the owner of the Ford dealer in that time,but the service advisor notice that the a/c don't work(the ambient temperature sensor was reading -47°F,so I did jump the sensor to make work till the new sensor arrive..You always have very good explanation..

Well done Dan. Nice diag. It goes to show you that the dealers these days are just interested in fast in & out jobs & could really care less. God Bless & stay safe, TMP from N.J.

Another car fixed! Thanks again for your knowledge sharing, Dan! On a VW Passat CC i had the auxiliary water pump connector swapped with the regulating valve connector of the AC compressor by the mechanic. Really hard to diagnose since both connectors were the same color. PWM measurements were very handy back then. Impressive job.

Another great video, I hope the client can show this to the Stealership so VW may reimburse him/her for your refrigerant and labor.

Thanks Dan , Yet again enjoyed the process watching you resolving the problem. 👍👍

Glad to have you back Dan 👍

Dan is an very secure person, for the bloopers are priceless. Love it.

Love the bloopers mate your work is exceptional great job 👍🦘🇦🇺

I am always looking forward to see your videos. Very clever.

Good to see you again Dan. Keep the videos coming, many people enjoy them.

Thank you very much for another wonderful video thank you for the insight knowledge of diagnosing a compressor problem. I guess this problem would also fall on all different types makes and models of all other vehicles even as well as North American vehicles thank you very much for your time and effort 10 out of 10.😊😊😊😊😊😊😊😊

Another great lesson from our sensei keep it up Dan 👏 top class workmanship

Great Video. You spent time diagnosing the issue. As you said the dealer said nothing wrong but it was. You should get your client to send the bill for your time to VW. If the dealer had investigated they may well have replaced the Air-conditioning pump. Always know I will learn something when you post a video Dan. 😀👍👍

That was a great diagnosis Dan well done !

Another great video specially useful this time of the year! This is the first time I’ve figured out the cause before it was disclosed

Great piece of tutorial,standard ,accurate and precise tutorial,thanks Dan for another great lesson

Tricky one, thank you Dan for sharing this with us!

Thank you for another video! Great video pin fitment and security is very important and overlooked a lot.

Het was even wachten maar dan kom je met een mooi verslag. Dank daarvoor Denny. It took a while, but then you come up with a nice report. Thanks for that.

Heerlijke temperatuur voor een koud biertje! Perfecte diagnose! Heerlijk om naar te kijken ! Proost !

Very thorough lesson thank you professor Dan 🙂

Fantastic fix Dan, love the video 😊👍👌

Great Job Dan. You did it again. Have a good one. Cheers, Nico.

These kind of problems are hard to find sometimes, nice find because you stuck with it!

Toujours d'excellentes vidéos et de la persévérance dans ta recherche de panne. Merci Dan pour la qualité de ton travail.

D.D Will always be the best diagnostician Thumbs up D.D

Thank you very much for sharing these breakdowns. You are the best Dan.

great work once again Dan. cheers for showing us.

Congrats Dan, You fix it again!😎

is a pleasure watching this guy

Brilliant video as always. Your overall knowledge is phenomenal, the way you are able to break down each problem into simple methodical steps that definitively rule out issues as you go along is brilliant. A joy to watch 👍🏻

Another excellent well made video. Thank you! 💜

Wow. The VW A/C Compressor has a cycling clutch type system when most modern compressors a continuously variable type system with no magnetic clutch. Anyways. Great video from DiagnoseDan one of the top Automotive Diagnostic Technicians on the planet.

I have learned a lot from Diagnosedan after i returnerd to work in this field like an electrician and Diagnostician thank you so much DAN you are the number one.😀💪👍

Common sense Dan fixed it again! You the man!

Always a pleasure to watch your videos. Take care

Great detective like always, it took Dan to sniff out the problem.

Great work Dan. Thanks for sharing. Cheers.

Dan I had no doubt that you would solve a problem and this is one of those frustrating problems, Dan you are a champion

Dan's the man. What a guy.

Thanks Dan I love it when you point out every aspect of the diagnosis and the fix do you ever think that the dealers really look or are capable of tracing faults Dan you are the man !👍🇬🇧

Great stuff Dan, well caught. Could have been a night mare, but you got it man. Thanks very much for your videos

What a 'cool' video. Nicely done - no parts required. Always look forward to your videos. Thank you for sharing with us.

fantastic video, I love troubleshooting problems too its so much fun

The vast majority of VW wiring harnesses were made (for decades) in the Ukraine. They had to move production and it takes a while for the replacement factories to achieve the same level of QA. EDIT: fixed minor typo.

Awesome Dan, great skills,

Nice video Dan! Thank you for your efforts and sharing knowledge! Amazing!

Again,good diagnostic,thank Dan! Nice video! Hvl.

Great one as usual! Thanks for simplifying complicated things. And I'm super jealous of all your tools!! 😂

I love your t-shirt! Thank for your support!

Dan you’re the best my brother 🙏🏽🙏🏽🙏🏽, I’m watching all the way from South Africa…. Thank you so much for the knowledge

Really good video Dan, amongst your best ones.

Thank you for sharing your knowledge. Peace.