NO PARTS REQUIRED that was awesome, Dan! Love the teardown and explanation of the variable A/C compressor too...very cool video :)

as an automechanic I can tell. you are one of the best who post auto repair videos, some of them charge for watching their videos, and you do it better and free, i hope some of the kids who are in school or learning to be a tech find your videos,from now you are my favorite.thanks for your great work

I really laughed at the "I'm going all the way for you guys". I think we as technicians need a very high sense of humor to not get crazy with all this cars problems. I'm definitely subscribed.

Dan is genius technician, there is not many like this humble and intelligent guy , thanks for sharing

Must say, that was among the best 30 minutes of instruction I have ever seen ! Fantastic job.

This is why your channel is my favorite channel to watch! Start to finish, I always learn something!

Hello Mr. Dan, greetings from the US. Nowadays I am a Pastor, but I had an auto repair 28 years ago. Closed the shop but still fixing family, neighbors, and sometimes church people's cars. I really enjoy your's expertise and your ability to communicate and teach in a clear way! I do understand how hard is to get your level of knowledge, it's needed many years of dedication and hunger! Congratulations and I think you would be a good Pastor/teacher of the Word of God if ever called! God keep blessing you.

You are the man DiagnoseDan!!!! you have a positive humble and kind approach to teaching!!!! very very powerful unique... i couldn't stop watching. not only do you have a happy customer you have lots of happy DiagnoseDan fans out here!!!!! Thank you for taking the time for us

Being a Field Service guy (Analytical and Scientific equipment) and as someone who is not and never has been into automotive repair business I am entranced by Dan's absolutely crushing videos and astonished by his uncompromising "no-soldier-left-behind" approach, superb technical prowess and solid expertise!Way to go, Dan!Have learned a lot already having watched just a handful of Dan's vids. The guiding principles of diagnosing the s..t out of any issue is the rock-solid foundation of Dan's surefire, thorough methodology that makes almost any other professional in this field pale in comparison to Dan. Dan has given me some valuable insights into how one should tackle any problem and successfully resolve it every time. Subscribed!

Not only is this guy good he's a great teacher to boot. Just watched two videos and was really impressed, even Scanner Danner and Pine Hollow give this guy HIGH MARKS. Thanks for sharing your knowledge and experience. TheReaper!

Thorough, logical, clear & concise. Good work!

Thanks for the new video Dan, this is basically the same with any ground side control circuit and will help with understanding the process and shortening the diagnosis time!! Great instruction all around........thanks for taking the time!

Excellent diagnosis Dan! Great visual explanation and breakdown procedures! It also pays to have the right test equipment!👍 Most mechanics wouldn't bother! Great job! 👍

Great video Dan! Love how you show the internal parts of the compressor, makes it easy to understand. Keep'em coming!

Dan, you are Jack of all trades. Talented technician , actor, teacher and video editor. You saved me a lot of money. Many thanks.

Dan you are the funniest guy in automotive if not the most talented. You are one of most talented technicians I come across on the Tube.

Another great video! Your methodical technique reminds me of the Ford factory videos. Back in the day, Ford would rent a conference room at our local Red Roof Inn and have all the techs from several surrounding dealers attend the "Factory Service" classes. It was great! Ford would feed us dinner (bet they don't do that any more) then train us on the latest models and the "Factory Approved" repair techniques. They didn't pay us for our time, but no matter. The information I learned paid me back quite well. Keep up the great work!

You did a GREAT job explaining variable displacement compressors. And you have a nice presentation style. Thank you for sharing.

As a DIYer your videos are so awesome. I'm trying to diagnose a dying AC on my Mercedes and now I know so much more about how the system works.

Hi Dan, another great great video about diagnosing vehicle problems. Really love to watch you at work and seeing the logical way you do things. It's a real pleasure to watch a PROFESSIONAL at work.

I have now watched many of your videos. You are an excellent diagnostician and a great teacher. Your channel is outstanding. Thank you.

It is my favorite channel from now :) I''m auto electrician and it always nice to get some snacks and get more knowledge! Thank You Dan!

One of the best educators of our time

I know this is a very old video but if that is your daughter OMG you can never deny that child she looks just like you my friend thank you for the knowledge you give us

another great video about electric diagnosis. I like how you get very specific on the meaning of electrical measurements on components and wires. Your measurements on the solenoid remind me of how control relays behave which is very similar in that when not grounded have power on both sides of the coil, but will have power only on one side when the pcm grounds the control coil in the relay.

Honestly i want to tell dan i do enjoy your videos more then a Hollywood movies .🤙👍

Your logical approach is second to none

Dan, you are a genius, I like the way you took us along during the whole Diagnosis process. i appreciate all your effort.

Thank for all you do professor! You are the best! 👍

Really good content and video quality! I am very impressed by your work man! We want more please!!!!

Great video Dan. Again showing why a second opinion from a competent technician is very important and saved the customer a lot of money and time.

Hi Dan, I went to college for my NVQ Level 3 and Diploma in vehicle repair and I have to say, of all the excellent teachers we had I reckon you would have been perfect for the job. The way you explain things in a simple and easily understood way for beginners is excellent. Love your videos so much! All the best, Dan from the UK.

You are excellent mechanic and great teacher , keep it up , greeting from Saudi Arabia.

Nice again mate loving your videos you got me addicted here 😂 it’s like gold mine for knowledge thank you Happy new year to you and your family 🍾🥂

Great video! Clear, concise, logical diagnostic procedures based on measurements and data gathering. Well done.

Thanks a billion times Dan, i came a cross a car with the a/c solenoid which i kept confusing for a pressure safety cut off switch, the tutorial of the slung plate made me understand how the design works and i was able to fix the problem. Previous mechanic replaced the compressor 3 times and ended up with the same problem

Another Great video Dan! Loved the inner workings of the compressor & how the variable swash plate is controlled by the solenoid Oh & I got to learn about bias voltage as well, always wondered what that voltage hanging about was ( ha ha) I can honestly tell you I’ve learnt more from watching your channel over the past few months than i have from the technical courses I attend at a certain German manufacturer (I’m a 30 yrs plus tech) Keep up the good work I look forward to the next instalment:-)

Dan you are awesome. I love the crazy act in the beginning. You are a technical wizard with a great sense of humor. Thanks for another great video.

Thank you for the great video Dan. The perfect balance of information and your sense of humor is why this is my favorite channel.

WOW. Dan makes it look so easy, just love to watch him doing it, together.

great fix, thanks again Dan 👌 that's a common fault on most vehicles where vibration or pulling forces are an issue, specially with bad motor mounts or bad shocks (bad roads or bumps also helps out the possibilities on that issue) i have seen it in many times its very common on transmission modules too

God you're good ! A very thorough diagnosis - Most interesting. Many thanks.....all the way from London.

This channel has some of the most informative electrical testing I've seen, its incredible learning more about wiring and doing these types of methods to isolate the issues, from VW to Ford this is a great channel for any issues, recommended the BMW door handle no start video to new viewers. Thank you Diag Dan

I’ve been working on cars since the 80’s and thought the new stuff was out of my league, but with a decent obd2 scanner and a good basic knowledge you have shown people that they don’t have to be held to ransom by main dealers, you sir are both humble and probably the best auto tech I have seen👍

As usual Dan, excellent video even though I do not have this type of AC system in my cars. I had the same problem where a connector pin was not fully snapped into the connector housing on my motorcycle. Sure enough, it was the pin coming from the kill switch to the electronic ignition module on my 1990 BMW GS which is why I noticed a slight hesitation while driving. I looked into the connector, saw a pin was very recessed, pulled back the rubber boot, pushed the pin forward and heard a nice "snap" as the pin engaged in the connector housing. Bingo...perfect! By the way, you have a nice Nussbaum lift. I had to settle for a MaxJax lift in my private home.

Learned alot from u Dan, thanks

I'd never thought of "variable" AC other than cycling the clutch - a variable angle swash plate is genuis, and really well demonstrated. The way you take the time to explain each step, AND what it means and go through the process each time, it's invaluable for hobbyists and professionals alike. Really love the way you work. Thanks so much!!

Dan. Thanks to you I finally understand what bias voltage is. If there’s something I live about the automobile field, other that learning new things everyday, it’s electrical diagnostics. And this will really help me save time in future diagnostics. Thanks again.

Very informative video. I learned something new. And your English is very good :-)

10:29 The thing held by the left hand is the reed valve assembly. FYI, this is what makes variable displacement compressors emit a low groaning noise when the swashplate is held for whatever reason at minimum stroke angle. The reed valves just begin fluttering about due to the very short piston travel, and the suction gas pressure oscillates very rapidly as a result, and the noise can propagate to the evaporator (and hence be heard from the vents) through the suction line (in variable displacement compressor systems a muffler is often found on it for this very reason). A lot of people complain about that kind of noise especially on German cars equipped with such compressors, but it's entirely normal as long as the variable displacement compressor isn't kept destroked due to a very low refrigerant charge, a faulty control valve or faulty control valve wiring or whatever abnormal reason.

Dan, your diagnostic skills are top notch. For many mechanics, it's easier for them to just throw parts at the problem. That benefits the mechanic and the shop, but is terrible for the poor customer. I salute you sir!

Dan your the man the time, effort and details you put into your videos for free is amazing

I get a kick from all these other shops making expensive diag calls and what do they tell the customer after replacing the parts and not fixed the problem? Dan you are on fire... Awesome vid I watch Scanner Danner also but the way you explained bias voltage.. I 👍

Diagnose dan is the man

This was scientific step by step diagnosis. Impressive!!

now that's a real tech not a parts changer Be blessed man A++++

Great video Dan. You’re a great tech and an equally brilliant teacher. Would you mind sharing which resource you used for the wiring diagram please?

Damn Leon beat me to it!

Briliant! Now I understand why in old cars, when AC kicked in, it felt like dragging the anchor behind the car, and this days it is imperceptible.

M an electrical engineer and love to see electrical system diagnosis...have been watching scannerdanner videos but after watching at yours , I have become your fan man....great job...calm and composed....

hitting like before you get angrier, I almost saw the HULK. lol

It would seem that when that wiring harness was assembled that particular pin didn't get pushed in all the way and locked into the connector. It initially made contact to the other side but eventually over time it worked its way loose. Basically this was an assembly mistake at the factory that didn't show up immediately.

Hi Dan, excellent explanation not just the diagnosis but the logic behind your thinking.Thank you for the time you put in helping us understand systems better.

Had a wire disconnected with the same code. This video helped a lot. Thanks Dan.

Hmm i thought you only worked on European cars🤔 good to see another brand in there Dan 👍 great video!

a ford connector with a fault, who's ever seen that before lmao, ford connectors are junk, great vid Dan.

This will always be as good as when first posted. Clear explanation and top-notch video production. A lot of work to explain, many thanks.

Kudos to you Diagnosedan. I have never come across someone who teaches with such dedication. It is an honor to watch your videos. Thanks a lot.

Great job Dan! I'm glad you have been taking the medication that the psychiatrist prescribed. You are able to focus much better. 😁

If I ever find myself living near you, I’m submitting my job resume to you

People tells me that I am a very good electrical diagnostic guy, but man, you are the friction best. Your video came up on my screen so I watched it, and only true diagnosticians will go as deep as you did, as well as make it very plain for others to follow. My hat comes off to you brother.

At last, a simple explanation! Excellent video.

Don’t you hate it when customers bring you a car with an empty petrol tank?

3.15 am, I started watching and I was laughing at your antics in the first moments so liked and subscribed instantly before watching the rest

Definitely the best diagnostic technician in the world

Dan's good, as retired auto electrician I love the way he explains step by step. Also with humour photography is excellent.👍👍👍👍👍

Excellent job Dan , I am very happy to watch videos like that and trace the fault with you , you have patience and skills to fix problems to save your customers’ money .

Wow that one really kept me glued to the screen. Amazing guy

Thank you so much for this channel. You are so good at explaining quite complex principles in a simple way.

Love your videos Dan... I’m a mechanic of 18 years now but always learning new things but specially from you..... I wish I was your friend you crazy Dutch person you 🤣.... Seriously though keep it up!!

Great explanation of a common sense, step-by-step approach to diagnosing an issue in modern vehicles, particularly the explanation of bias voltage and its use in diagnosing circuits controlled by the PCM, and the value of the Power Probe in this process; i.e. a great use of Occam's Razor to find the simplest solution to a potentially complex and expensive problem. I really appreciate your taking the time to make this video on a Saturday, realizing that you probably had to make it in multiple languages for your different audiences. I appreciate your showing and explaining to us the swash plate method of controlling the pistons in the compressor, something I learned the hard way about a month ago.

The best video ever!! You just got a subscriber for life!! I like the way you explain and show with diagram for beginners not talk about it for seasoned techs. You know your audience. I’ve never open a a/c compressor and that was awesome to see how it works. Thank you so much.

Great job Dan. I have learned some things new from you. I will always watch your videos

Dan, you are the best teacher God bless you with more wisdom.

What a brilliant explanation of how the compressor and circuit works. Exactly at my level of understanding. Dan, you are the man. 👍

I really enjoy your videos. I’m not a mechanic, but you explain everything well enough that I can follow along with the diagnostics.

I am a retired auto mechanic and this is one of the best videos that I have seen.

Very pedagogic Dan!! Super!

You are an excellent auto lecturer who teach the trouble diagnose more logicality. All of your customers will end up their repair only with replacing the exactly required spare part. Modern Technicians end up the repair job after removing 03 genuine parts with fake, finding the fault in the last one. Your customers are really LUCKY.

For a young guy has a huge amount of knowledge.

Good troubleshooting, I admire the way you work to find the actual fault, and not jump to conclusions. Lovely fan club too.

As ALWAYS, exceptional trouble shooting skills here. You are very talented and an excellent teacher as well. Thanks.

Dan's THE Man !! Just goes to show how too many forget the fundamentals and jump straight over into replacing parts... Shotgun approach is very bad, especially to the poor customer who has to pay for the incompetence.. Thank God for guys like you Dan, who educate us and teach us the RIGHT way.. Two thumbs up man !!

This has got to be about the best car diagnostics video I've ever seen! Excellent explanation, all very clear and easy to understand. I've just subscribed, so will be trawling through your other videos in due course my friend! 👍

First time I check this site and I am suprised how good explaination you give. As a refrigeration technitian, that was an amazing fix. Thanks and keep doing more!!!

I'm a hands on guy. This is the best AC compressor troubleshooting video I've seen this far. Now onto the next 15 minutes

Excellent explanation of the system and diagnosis process. Another valuable lesson for my guys. Great work Dan.

I've been watching a lot of video in the internet. So far your videos are the best. You explained very throughly and easy to understand. You speak very slow. You let your audience understand it very well. Keep up the good work.

and the academy award goes to diagnose dan!

Excellent stuff Dan, as always, I enjoy every episode.