This is probably one of the best AC videos on youtube. This guy breaks every aspect of the system down, how it should work, things to check and expected outcomes and possible issues. We even got to watch him diagnose a vehicle. Wow this was great and more people should be subscribing to this guy. I feel like I just got trained like a mechanic!

Best auto AC video on KZfaq. A tech that actually knows how the AC system operates and explains each scenario so you can use your own brain to determine your problem. THANK YOU!

I love the fact that you didn’t edit out the part where you diagnosed that it was the hot/cold control knob... I like the humbleness and your sense of humor as well

I actually enjoyed the explanation. Normally I just skip through the Blah, blah, blah but your mixture of humor and knowledge is outstanding. Keep up the GREAT work!!!

This guy is a real mechanic. Very well done.

Because of your videos, I was able to go from no AC experience to successfully completing a complete AC overhaul on my beloved 95 chevy g20 conversion van, which has front and rear AC. I replaced the compressor, pressure switchs, evaporator, orrifice tube, expansion valve, o-rings, flushed everything, vacuumed, and recharged. I learned the hardway that Santech is not better than Acdelco, and your diagnosing methodology came out in me and I was able to use the gm service manual to deduce that my recent ac issue was due to a bad high pressure switch that I installed new during the overhaul of last summer. Well ysterday I completed and it is working correctly now, so I thank you R&W!!

Great video! One thing I would add: With the style of AC gauge fittings you have, watch your gauges as you screw in the knob to open the Schrader valve in the service ports. As SOON as you see pressure register on the gauge, STOP! Far too many people screw those knobs down all the way and damage the Schrader valves. Then they won't seal correctly and all the refrigerant is lost. Seen it happen too many times.

I realize that this video is old, but it is one of the best car repair videos I've seen. The on-air guy helps with diagnostics and repair. There are a lot of repair videos out on youtube (and that is great), the issue for us do-it-yourself people is the diagnostics. Great video!

You are crazy smart and very humble. Thanks for this very honest you tube.

That was the most fulfilling outcome for education. You go past the physical refrigerant system and diagnose electronics. That’s what it takes sometimes thank you for that surprise

Awesome video, yet again! My knowledge of cars has come a long way thanks to you. Always informative! Bless you man and thanks for helping the DIY community.

Nice video. As an electronics tech with 40+ years experience, I loved your explanations, with visual aids.Your outcome was real world.

As usual, awesome explaination. I am a very very small used car dealer (and female) and really appreciate your tutorials because otherwise I could not make it in this economy. Thank you SO MUCH!

And the evaporator core is usually in some God forsaken place in your dash. 😆

..Very Good Explanation of how the AC System works and How to Diagnose it !!! You did a Better job than most of the so-called "pros" on KZfaq! This is a handy video because it helped me find out that a pressure switch is bad on a '94 Crown Vic. Thanks...!!!

Thank you for taking the time to make this video and for your detailed explanation of how the system works. I had to open my system for the first time on Tuesday to replace my compressor, orifice and accumulator at which point I discovered that the orifice was installed backwards.

Great job in explaining. You were technically correct explaining how the low pressure switch has an open or closed connection to pass electricity. Very good explaining technical in simple dialogue. That is what makes you a technical teacher! thanks for your time and effort! Keep up the good work. 👍

I love how you explain the diagnostic process alongside explaining the engineering! The problem I have wasn't addressed in this video and yet I'm still glad I spent my time watching it. Thank you for the education!

the best tutorial ever on the subject. I thank you for taking the time to post this Sir.

You are a very good teacher, kudos very informative, very professional, very excellent. One of the best videos I've seen yet!!!!

He did all this leg work and chasing down the problem. Got paid ZERO for all that. Much respect to good mechanics 🧰

Great explanation as to how the a/c system functions. Thanks for the overview which makes diagnosing a/c issues easier.

You are on your way to great awards. This was SOOO helpful. Thank you! Keep up the awesome work!!!

This is one of the best AC videos on youtube!

This is the most helpful video I've watched in a long time! Youre a great teacher. Subbed

You did a great job walking through the system. Awesome video.

I really learned a lot about how AC systems work and how to diagnose the entire system, keep up the good work and thank you!!

good stuff, quality content went over whole ac system explaining clearly.

I learned a lot from this video compared to many other auto A/C videos

I think you did an excellent job of explaining the pressures and why the system reacts the way it does. Nice to add a little humor. All in all, very helpful. Much thanks.

Great video.Really helpful and explained in a way that is easy to understand how the system works.Gonna be tackling my AC problem with actual knowledge and understanding now!

You are a very sharp tech and very entertaining teacher, I love that pry bar pointer you use. Thanks.

I loved your lemonade comment at the end! Plus I learned a bit about how to use the gauges, and how to diagnose problems. As always, you do a fantastic job editing your videos.

Very good video. I have done refrigeration for over 59 yrs. and this video is one of the best explanations of how the systems work. Thanks

YES!!! Finally found this video again. I've been looking for it for days. Thank you for taking the time to explain how the system functions and what different gauge readings could mean.

SUPERB, you explained it as teaching a 5th grader. BEST instructional video

"...Usually in some God-forsaken place under your dash" 🤣

Most comprehensive and well explained AC tutorial I’ve ever seen. Very thorough and great info. Thanks so much!

I've been wanting to find out exactly how the all-electronic climate controls work. Thanks!!!

Good presentation and great job with the diagram and explain the details and possible scenarios that do occur, thanks

Very excellent, instructive video. I had a similar problem once before. In the hot months I would physically turn off the hot water supply from the engine cooling system with a manual valve, or simply disconnect the heater hoses and bypass the hvac system. Of course, it's a little inconvenient, and you have to reconnect to turn the hot water back on in the cool or cold weather.

This is probably the best video I’ve found, that succinctly describes correct operation and possible faults by the gauge readings… Thanks!

This is a great channel to follow. Too many bs mechanic channels getting into "don't buy this or that, never put this on your car, share your ride and etc". This is pure educational, great explanations on everything

Thanks! Great video and you sound very knowledgeable about AC auto systems!!

Very, very helpful video. Great job putting this together. Thank you!

Thank you, man! This is the only video where I learned when is the correct time to read the gauges to be compared to the chart. Every other video says this much of pressure readings but the needle is moving all the time and doesn't mention at which point those readings should be taken.

The only video I found that explains the proper valve use. When just measuring pressures, the two valves are closed. When vacuuming the system or feeding Freon, open appropriate valve. Thanks! People, please buy this tech a coffee. Peace.

Excellent, and funny video! Thanks for sharing. 👍🏻

....Make lemonade 🤣🤣 man not only you great at explaining, great sense of humor too.. keep up the great work.

Great video. I have just gotten into teaching AC at my local college and this video answers so many questions and helps so much. Thank you!

Thank you for your detail explanation. I do have a better understanding now as a DIY on how to troubleshoot the ac system. You guys make the world a better place by sharing you knowledge with the rest of the world.Great job my friend.

Thank you so much for doing this video! Awesome man now I feel confident that I can fix my AC

Mr. R NW, you are a genius.

Just did my entire ac replacement..thank you for time in making this video!

Very good and thorough instruction, even if one has someone else do the repair, they should understand the system. I don't know how often I hear people with used cars need 'new compressor', etc. I see now that more likely they had a valve or other issue. Keep up the good work!

Great job 👍👏 big dunk contest ups to you! You're a awesome teacher

Actually a really good explanation of how the AC system should work, and what your gauges are telling you. Very nice. Great video.

Wow, an actual mechanic who troubleshoots and tests. Impressive work my friend.

I have been working on cars for many years... Every time I see one your videos, I learn something new.. You are a very good mechanic, and do great videos, in well presented formats for all levels of viewers.. Awesome.....👍

I definitely took a lot of notes..Excellent job sir.

pahaha the ending lemonade quote was so unexpected and hilarious LOL

Excellent! I've watched quite a few ac troubleshooting videos in an attempt to solve my ac issues. None have been as clear or comprehensive. Thank you!

I'm a subscriber to your channel and I have to tell you, when I see you've posted something explaining how an automotive system works I know it's going to be something I won't be able to just sit back and give a leisurely watch to. Rather, I know it's going to be something I'll have to give some real attention to. I do that because I know that if I do, I'm going to have something explained to me by a truly talented teacher. Thanks for putting "it" out there for me to "get"". You've a great gift.

Good presentation and your video production quality is improving over previous. Keep up the good work mate.

Thanks. This is really helpful. You explain it really well!👌🏻👍💯

First off, love the channel, and your easy to understand repairs and methods. THANK YOU AND KEEP THEM COMING. My 2002 Merc Benz S430 (W220) A/C stopped working after I replaced the windshield wiper hose (with the heater wire/ cable inside). The unit small red light is on indicating the system works, but will not blow cold air. The clutch does engage, on then off, constantly. The typical reset feature/ trick doesn't work for whatever this error is currently. I checked the relays/ switched and replaced them as well. Assuming the system may have been low on refrigerant, I filled it with what it took in, which appeared to be almost two full "tall" cans of AC Pro. Reset the system and the air came on "absolutely freezing cold" for about two minutes then shut off again. After resetting and attempting to make it stay on, it wouldn't reset anymore after four attempts. I noticed a clear liquid had leaked from the bottom center of the car down the driveway to the rear of the car, no smell or color, but thicker than water. The next day, with the engine running and the air refilled and reset once more, I heard a loud hissing and bursting flow of air or spray from under the hood, front drivers side for about 40 seconds then stopped. I believe it was a pressure relief vale of some sort !!! Scared the &%$#@^& %$#%^&%#@ out of me to be exact. The clutch still engages, on then off, constantly. Whats wrong with the cars AC ????? What would you recommend I check or replace???? No AC for the past four months now...

This is the best A/C troubleshooting and theory video I’ve seen. Kudos for helping me to figure out what’s up with my A/C system 👍👍

Man you know your stuff, and also funny at the same time. thanks I learned alot

HEY GUYS, for those of you that have a similar issue, you can always just break off the blend door from its controller and use some tape to close it for ac for the summer months so that you can have cold ac without having to take the whole dash out and replace it . just fyi. I did this to a 97 ranger and its been working great, just rig it using some gray plastic tape.

A very informative video - thanks for making it. The light hearted approach also made it entertaining, as well as educational.

I'm impressed, great video. Very clearly explained, you know your stuff.

Thanks a lot bro!!! Really helpful!

Nice tutorial, new subscriber

Well done, well explained, and very relevant to the Ford Escape I'm trying to learn how to fix...just for the fun of accomplishing something "self taught". Never fail to learn something on your videos.

Very helpful tip, I’m an HVAC Technician for industrial and comercial bldg’s but I have never even thought of look into cars a/c.

"You can't always get what you want, but if you try sometimes, you can make lemonade with it" - philosopher Hahahahahaha!!!

I watch a lot of auto repair guys on KZfaq and I have to say your content is right up there with the best of them. Good work man. Keep it up!

Awesome video, very well explained in simple terms with a bit of humor and a lot of humility. This is the first time I've watched one of your videos and it's up there with the best. Just subscribed. Keep up the good work brother. God Bless

That was a great tutorial. Pulling a dash apart is a really big deal. I plan on recording mine if I have to do it just to help eliminate missing steps during reassembly.

Great video. You explain perfectly. I’m a caveman, and I understood. Thanks

Great explaining of how it works . Please let os know if the owner wants if fixed. I also have the same meter you have got it from harbor freight . I only paid 15.00 for it for a black friday deal. I also get the free meters when they have the coupon in the paper. But only when someone drives me there. As I spent 7 years in the NAVY on submarines during the 80s and got hurt bad leaving me in a wheelchair I have a morphine pump so I can not work but get to watch your great videos!!!!

Great vid , brother. Having trouble with my Tacoma ac. This helped me tremendously!

Ratchets And Wrenches thank you for such great explanation of the system. I have learned many things from you. I'm just a do it yourselfer that likes to save money and fix its own cars. Good video!!

Shame you could not just replace the blend door, something easy.. prob crappy design. Good job giving your info.

Bypass the heater core, top off the AC it's Southern California you don't need no stinkin heater!

One of the more thorough diagnostics I've seen, thank you!

One of my favorite channels. Great information delivered as it should. Thank you!

Disconnect the heater core hoses so you dont get heat

location of evaporator "Some God forsaken place"- got That right.

Very thorough explanation like a pro. Understood every word you explained in 16:47 mins. Diagram with low and hi pressure 👍 you got my subscription and 🔔 rings

AWESOME STUFF by a well structured guy who obviously knows what he is talking about. Great!

This guy is super smart.

Seems complicated, a lot of components that can fail and cause your cars A/C not to work, I always found it extremely funny from my experience working at an auto parts store on how many people think those freon cans will simply fix their A/C system! LOL

Great job, I have watched numerous videos explaining the automotive A/C cycle, 1st time it was mentioned that the actual on/off cycle of the compressor is controlled by the low pressure switch. Makes sense, a pressure too low the designed spec of the compressor could damage it and therefore shuts off the 12 v feed to the compressor coil clutch. Keep up the great work!!

2 years later I have a car with your 3rd example with a high side over 100 psi. Now I at least have it narrowed down to an expansion valve stuck open the evap intake or a check valve in the compressor. Thank you for your very helpful video.

Bypass the heater core, that's what we do in south Florida. Heat is worthless here as it is only a waste product to get rid of.

Dumb question: Why don't you just block the heater hose? If still no cold air, then the blend door has failed in the heat only position rather than somewhere in between. If so, perhaps the door can be moved with a borescope.

I like videos like this. Humble demeanor, easy to understand, and funny as hell. Good tutorial and I'll be checking out your other videos.

this was very informative! Thank you very much! I'll be replacing my a.c. compressor and the low pressure hose in the near future.

Tried a new Freon called Frigid Hillary. Really cold air now.