A/C Repair Lasted One Day [What Did I Do Wrong?] - Part 1

Air Condition repair work can lead to very unhappy customers if you don't properly communicate and document everything. This is a follow up on my sons 86 Nissan 300zx (original repair • A/C Leak Testing, Repa... )
And here is the link to part 2 of this video • A/C Repair Lasted One ...
00:00 - pressure testing for a leak
01:50 - leak found
06:00 - customer communication
10:00 - removing the suction and discharge lines
11:15 - A/C line repair ‪@Autocoolingsolutions‬
#AutoCoolingSolutionsLLC
13:30 - vacuum pump oil change
15:45 - testing vacuum pump with micron gauge
19:27 - vacuum pump can add air to a system when off
20:20 - how to measure an A/C line for repair
22:45 - repairing an A/C line
33:20 - vacuum decay test using a micron gauge
37:20 - 2.5 days of holding vacuum, will it hold pressure?
41:28 - do we still need to pressure test when the system hold vacuum?
43:16 - we now have one pissed off customer (Document EVERYTHING!)
47:40 - on hold until we locate some parts
ScannerDanner Tools:
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For more information on this topic, I have written a “field manual” called Engine Performance Diagnostics which is available at www.scannerdanner.com as an eBook or paper book.
Want even more diagnostic training? Whether you are a DIY trying to fix your own car, someone looking to become an auto technician, or a current auto technician that wants to get more into diagnostics, subscribe to ScannerDanner Premium www.scannerdanner.com/join-sc... There is a 14 day free trial.
On ScannerDanner Premium I will bring you right into my classroom at Rosedale Technical College. You will find page for page lectures taken right from my book as well as exclusive classroom type case studies. What is so special about these classroom case studies? I pull live problem vehicles directly into my classroom and we troubleshoot them in real time, using and applying the theory and testing procedures we learn during the classroom lectures. There is no better on-line training of how to troubleshoot automotive electrical and electronics systems anywhere!
Disclaimer:
Due to factors beyond the control of ScannerDanner LLC, it cannot guarantee against unauthorized modifications of this information, or improper use of this information. ScannerDanner LLC assumes no liability for property damage or injury incurred as a result of any of the information contained in this video. ScannerDanner LLC recommends safe practices when working with power tools, automotive lifts, lifting tools, jack stands, electrical equipment, blunt instruments, chemicals, lubricants, or any other tools or equipment seen or implied in this video. Due to factors beyond the control of ScannerDanner LLC, no information contained in this video shall create any express or implied warranty or guarantee of any particular result. Any injury, damage or loss that may result from improper use of these tools, equipment, or the information contained in this video is the sole responsibility of the user and not ScannerDanner LLC.

[@hxc7273]

You can have a leak under vacuum but not under pressure or vice versa. We see that on evap systems sometimes. Rubber flexes one way under pressure but the opposite way under vacuum.

[@ScannerDanner]

Agree 100%! So it is both tests that are needed. Thanks for sharing this.

[@cdars1]

Oo didnt kno that thanks

[@coopthegangskitsDrawingsfu5515]

​@@ScannerDanner regarding your Mercedes e500 video you did years ago. I have a inoperable digital dash on a 2005 mercedes-benz cl-class 5.0l would it be the similar issue because it won't start. I've been told it could be up to 10k to troubleshoot the CPU any suggestions?

[@ScannerDanner]

@@coopthegangskitsDrawingsfu5515 could be my friend. Step 1 is to scan it, if it won't communicate with your scan tool, then start measuring an testing the CAN network. You'll need good service info and diagrams to do that. If you need additional help, use my forum, we can help you and it is free to join www.scannerdanner.com

[@coopthegangskitsDrawingsfu5515]

@@ScannerDanner I sure will thank you for the quick reply. I appreciate it you willingness to help me thank you for all you do.

[@johnaclark1]

This is a fantastic video. I've had people get upset with me when they bring something like this to me and ask for a repair. When I tell them it needs everything replaced they get upset and think I'm trying to just make money off them. No, every time I've tried to bandaid one part this is EXACTLY what happens. When AC systems go this bad, everything needs replaced. When you get the compressor leak stopped, you will end up with a condenser leak next. You're just playing whack-a-mole.

[@ScannerDanner]

Whack-a-mole indeed. Thanks so much!

[@Randomgearhead]

We just tell em sometime when u start fixing up old ac systems u find the next weakest component. We never replace everything. Most time the aftermarket everything parts don't fit right and will cause fitment issues. Just keep patching it. Never eat it. Either explain and make them understand or let em go.

[@LynxStarAuto]

@@Randomgearhead naw you replace it all with new, or politely decline the job. I'm a mechanic, not a patch man.

[@Randomgearhead]

@@LynxStarAuto we give the customer the choice. Not just turn em away cause they trying to save some $$

[@LynxStarAuto]

@@Randomgearhead If they are trying to save some money, they can take it to first shade tree they find, and let them inherit that headache. I have to run a full fledged repair shop with 6 employees. Not fair to them to burn their hard earned time trying to appease a cheapskate. Big problem with mechanics today. Don't know how to say no. Treat every car that shows up to the shop like it's the last car they will ever work on. That becomes an expensive headache for the shop, not the customer. No thank you.

[@areid1440]

As my teacher I really appreciate your honesty and how humble you are, even after doing these repairs for years you are still open to criticism without being angry.

[@serenahansen2394]

The moment you think you know everything is the moment you stop learning. An open mind is the only path to wisdom.

[@michaelgleason4791]

I love content creators who a) are willing to listen to their comments, and b) have a knowledgeable comment section.

[@htownblue11]

Paul now that we know you’re not a perfect KZbin Diagnostician/mechanic, we of course are all extremely let down and disappointed 😂🤣. Good thing we know the real mechanical Messiah to fix our mistakes! Great breakdown of how things can break post repair of a primary issue.

[@ScannerDanner]

Thanks TJ

[@gregskibinski9937]

I have a 07 blazer 6 cylinder. About 4 yrs ago in the middle of winter. My power steering lines on top of the front left wheel, just under the mounting bracket it sprung a pin hole. Being on a low income lifestyle I had no choice but to fix it myself. Cut it in two with a dremel. And used a 3/8” compression fitting and it is still working to this day. I know it’s not the proper fix but you have to do what you have to. Love your videos Thank You!

[@ecaparts]

Leak checking with nitrogen at 200 psi is well over 13x more of a pressure differential than removing atmospheric pressure at sea level (14.7 psi). In my experience a micron gauge can and will be a good assessment of a leak check verification, AFTER confirming with a pressure test. There are some leaks that will only leak with a positive pressure, so you should do both. Nitrogen first, then evacuate, decay test and charge.

[@Autocoolingsolutions]

Hey ScannerDanner, just came across your video and wanted to say thank you for trying out and showing our AC Line Repair Kit. You've got a nice informative auto repair channel here. This is a good example video of why we even developed these kits. We'll put up a link to your video from our site.

[@ScannerDanner]

Hey awesome to hear from you guys! You have a great product! I mentioned in this video that I didn't do the suction line because this was the first time using your product and I didn't fully trust it yet, so only repaired the line that was leaking. I am now regretting that decision. I absolutely should have done that low side hose too 😪 as I now 100% trust and recommend your product. Let me know if you like any other tags in the description to help drive traffic. It's the least I can do. Appreciate again the great communication with your staff about getting my line custom made, the fast shipping and of course an awesome product!

[@athhud]

I learned many years ago on my refrigerator that the micron gauge doesn’t always expose a leak under pressure. In my case the system was completely sealed under vacuum because the “leak” was sucked shut. It took a lot of head scratching to figure that one out, since the leak was in an area that was extremely hard to see.

[@fenceman53]

Sorry son will get ac working by late fall 🍁. Tough it out. Come back this winter for heater core replacement

[@theadventuresofjavier8698]

When we do a a/c repair we state on the invoice that after the repair we did another leak inspection and we state “ no other leaks noted at this time” However you are on point about the angry customers.In my 30 plus years in the field I noticed that nothing angers a customer more than a/c problems😡😡😡 Always a pleasure to watch your videos Paul

[@Mooseguy15]

That's probably cause it's so expensive to work on in the first place.

[@terryharvey4811]

@@Mooseguy15 Has more to do with creature comfort than money. If a car has 4 bald tires and no A/C, YOU CAN BET YOUR ARSE THE A/C GETS FIXED FIRST 90% OF THE TIME.

[@coldfinger459sub0]

Your learning grasshopper 👍 Vacuum is only 14. 7 inches difference between atmosphere pressure and the lowest vacuum how could anyone expect that to compare to a positive pressure of 200 psi using nitrogen. Vacuum can actually pull rubber O-rings in-words sealing up the leak with a light oil film on it. But as soon as you pressurize the system rubber O-ring deforms and pushes in the opposite direction bypassing pressure. And like you said never ever give a guarantee on a 30-year-old car anything except for the singular particular part that you changed and that’s all nothing more. It’s a domino effect of failures one after another. Give the customer the option and notify them at this age all rubber components should be changed but if you choose to turn down the recommendation that is 100% your choice mr. customer after that it’s a gamble. Hope to see you at the MACS expo this year in Tennessee. Where any professional mechanic or school instructor who is actually serious about their trade and resources for teaching would attend. Now get a digital gauge like to Fieldpiece SM480V. To take your high-pressure nitrogen to the next level where you’re capable of measuring down to 1/10 of a single PSI.

[@rafaelmarin1963]

Communication is the key.

[@johnaclark1]

I actually use a ball valve on the end of my center hose of my manifold gauge set. The check valve is nice but, as you found, isn't always helpful. With the ball valve I can control it as I need.

[@throttlebottle5906]

check valves and schrader cores are meant to hold positive pressure , not negative or atmospheric pressure trying to go through them backwards. I was surprised that hose check-valve was held the vacuum when he removed it and didn't lose any in the process. even ball valves have void pockets in the center portion around the ball, you should cycle the a few times while pulling vacuum or leave them partway shut to expose the voids via the hole through the ball. 😉

[@dennissytsma3561]

I'm a fan. I had the same vacuum pump and it failed shortly after the 90-day warranty expired. Shop online for a highly rated pump because you are going to need another one soon. I often try to educate people that local fabrication and doing what you did online is often most cost effective for no longer available parts. I saw on television show wheeler dealers an automotive refrigeration hose fabrication system that was rented online and returned to company because was too expensive to buy and could fabricate any hose and used for work on very expensive restorations. Love your work!

[@jp-ny2pd]

Out of habit I always replaced all the rubber parts of the AC System that didn't involve ripping out the dash. But then again, it was my car and I was doing the work. I've been on the receiving end of a firewall forward AC repair and it was always sold as "This is what we recommend for a warranty". Price sucked, but I appreciated the honesty. I have used those repair hoses before. I'd always torque down the side I couldn't easily reach, and leave the side I could easily reach relatively loose until it was on the car. Less chance of having to disturb anything once it's tightened down.

[@majorahole]

It's so satisfying when you can fix your ac yourself. If u want ac in an old car just replace everything. Condenser evaporator compressor lines and receiver/dryer and all the o-rings. On older vehicles their ac is relatively simple so they usually just work. Sometimes you get lucky and you don't have to replace anything..

[@kansaskev8684]

I really appreciate this video. AC work can be more complicated than we think, and frustrating too!

[@davidsawyer1599]

Hey Paul it's no fun watching y'all suffer through this. Yet we are grateful for all the insight. Pro tip. Plumbers have a saying. There's tight then there's Plumbers tight. In other words Plumbers don't torque the living day lights out of fittings. It's snug where nothing will move. It's a shame you can't braze or solder the fitting to the pipe. Have a great day.

[@markjohnson-fd3qs]

Great, Great video. Love the honesty. I always tell people there is no winning with A/C repair. This video shows absolutely what can go wrong with A/C systems. I'm sure you have helped sell many gauges. Now I have to have one. With auto A/c service sometimes there are more questions than answers, afterwards. You have answered many of my (decades old) questions. Thank you

[@JRLawson1234]

Paul, thank you for these videos. I started the premium channel a couple months ago and am so pleased with the classes and content!

[@ScannerDanner]

Thank you so much!

[@rickd6421]

Great video Paul! I can imagine the frustrations you are feeling after a soak tested vacuum check. It makes for an expensive job when leaks begin to pop up all over the system and AC work for customers should come with a disclaimer to cover any additional faults not related to the repair at hand. If there is one thing i've learnt from this video, it is never to do a vacuum check first. Pressure check first then vacuum check before recharging refrigerant. Look forward to part 2! Great stuff :)

[@stephenmoxley3004]

Great video, Paul. Most shops now use a written disclaimer that the customer has to sign, detailing the complex nature of A/C systems and the fact that numerous components are subject to failure; and that they are ALL at the customer's expense. That process seems to separate the weak from the strong. Looking forward to the next chapter on this one.

[@jamesbruno5896]

Nice job Paul, I've used those compression style replacement hoses b4 with no problems

[@ronniestevens9268]

What a valuable lesson! I was skeptical when you said in the first video that just because an AC system holds a good vacuum doesn't prove that it won't leak under pressure. My thinking was..... doesn't pulling a vacuum mean there can't possibly be any leaks or it wouldn't hold the vacuum? It goes without saying that if it will hold a vacuum, then it must also hold pressure! I would have continued believing this, if I had not seen you prove your point with the video. I'm so thankful that I was able to see with my own eyes that if you don't do BOTH a vacuum pull down AND a pressure check, you may never find the leak. Like the old saying........a picture (video) is worth a thousand words.

[@1977jelliott]

"o" ring seals that are flattened out can be problematic for leaking under pressure but not under vacuum and vice versa. There are a few methods to get around this problem in testing for leaks with these charecteristics 😉

[@isalmankhan1]

WoW great example of multiple issue's associated to one problem & in this case it's the A/C not working due to multiple components failure, this one is really special👍 Thanks for sharing SD😍 Special Thanks to Caleb Danner👍 Stay Safe & Blessed Guy's❤

[@johnlenoir1023]

Excellent lesson I'm not sure why a system can hold vacuum but you put it under pressure when it expands it starts leaking and very interesting thank you for the video I love it

[@pezmontoya9679]

I think it may be a good idea to only take vehicles from a specific year. The last shop I was at took 2000s and later only. Thank you for giving the mentality on this type of issue

[@edgardorodriguez6754]

Very cool video. Same thing happened to me on my 1999 GMC truck. I pulled vacuum on the system and it was fine. Charged the system after that and compressor started leaking.

[@gregorypapenfus1705]

I have also used that company to replace rotted out line going to rear ac evaporator on my suburban. Have had them on for more than 2 years now with no issues.

[@Howyoudoing98765]

This was a great A/C class. Steps should be repair, pressure test, vacuum then recharge. JB BLACk Gold vacuum pump oil is what you need.

[@hugh007]

I bought a reasonably priced refrigerent 'sniffer'. Like a Geiger counter, it beeps when brought near a gas leak. Found a slow leak in the evaporator that I couldnt find otherwise. Great video. Thanks.

[@chrisruth2040]

I thank God for gift given you and to share that wealth of knowledge. It been helpful to me as Diesel Tech and Automotive Tech. God Bless you and your family. Enjoy learning more

[@billyfox384]

On older cars I give the cust options- replace everything (compressor, condenser and hoses) with understanding that evap leak is always a possible leak. OR replace what we know has failed. I cover one evac and recharge at no cost with additional repairs. After that their paying. I'm in FL so a DO ALOT of a/c work. Communication is key. Simply explaining that your dealing with an invisable gas that is always under pressure. Some people assume that if they don't use the A/C it shouldn't leak. Education and communication is key. ALSO always replace the service ports or valves. Very easy to miss with hoses hooked up. Every system gets dye as well.

[@stevenayala2324]

love it bro no lie its hard to show love to the old cars but when you do its better then a new one i really want see that obs in the back behind Caleb‘s car looks clean

[@erntaku]

Just found your channel and I'm loving these videos. On the micron gauge leak-down readings changing; It could be due to temperature changes in the actual gauge materials. Most mechanical to digital measuring devices use a material that changes electrical resistance as it deforms. So hypothetically, it could give a different value after having sat through over-night temps.

[@AnthonyLovato]

I have a similar AC manifold and I put the check valve at the manifold, not at the pump. I don't lose vacuum whi turned off the pump. I don't know if that makes a difference but that's my experience. Awesome videos, I have learned so much from you. Thank you. 🤙

[@TheMasterHackUS]

Great video. You have to set the expectation for the customer. Its 36 years old and while we found x to have failed, there is a chance that there can be other components that fail due to age and the fact that those original components have been disturbed in the process of diagnosing and repair.

[@TheGibby3340]

As a DIY’er & After two super frustrating seasons of trying to secure a tight system on my aging vehicle, I can totally sympathize. What used to sound absurd “you need lines, compressor & condenser”. Now seems accurate and completely reasonable. Economically sensible…that another matter. Thx & cheers 👍

[@shauno3697]

Another resource you could try if/when next time that obscure part is unavailable, is Ritter Tech Parker Store. There's one on your piece of the planet on Delwar Road. They primarily do hydraulic hose repair and replacements. But IIRC, we sourced them for AC hoses and repair parts while I was a fleet mechanic about 15 years ago. At the time, we had to figure out how to fix auxiliary AC systems in paratransit vehicles on a more immediate basis. We sourced a ferrule crimping tool for AC hoses through Mac or Matco tools and Ritter supplied us bulk hoses and ferrules. I really want to say they made the new AC hoses for us preceding the crimping tool. Given your metal lines were still intact, it might be possible to cut the old ferrules off, pull the hose off and replace with new stuff. I can't prove anything for you. My memory is iffy and I can't promise that you wouldn't damage the part of the piping that you're trying to salvage. I have cut a few various lines/hoses, and ferrules open to see how they work and they typically have a barbed end to them and the hose gets stiff and brittle, yet molded to the shape of the barbs. I hate to offer a crap shoot, but you're stuck in plan B mode anyway. If you really can't avoid a next time, I hope there's something useful in this.

[@boboften9952]

Hygroscopic meaning Definition of hygroscopic 1 : readily taking up and retaining moisture hygroscopic soils. 2 : taken up and retained under some conditions of humidity and temperature hygroscopic water in clay.

[@boboften9952]

2:00 Age vs condition of hoses and system . Fighting Shite up hill . Well stated Sir Dan

[@Tony-rl2fr]

Good times, I used to do auto ac work back in the 80s/90s. Takes me back to "glory" days 😆

[@mnewln1800]

Ya! The glory days of R12! Hmm, why doesn't anyone talk about the ozone layer anymore?🤔

[@richhelm21]

'Hygroscopic' - tending to absorb moisture from the air. Brake fluid is the most obvious automotive hygroscopic fluid. Great tutorial as usual Paul. Nice fix. When a vehicle is older, i always have the conversation with the customer regarding age related issues. You just have to. If you can educate & inform, you will avoid the majority of problems and have a happy repeat customer. 🙂

[@kevinschmitt4050]

Hey Paul. I just watched the first part of this series where you we’re discussing initial quick checks. I’ve started looking to see which side of the condenser the service port is on. Had a Kia last week with a clogged condenser. A quick diagnosis because the pressure sensor and the service port were on opposite sides of the thing.

[@MegaDysart]

Yeah vacuum decay tests are awesome but I don't rely on them anymore. For one, some seals only leak under pressure and hold under a vacuum. Another thing is that you can't check the service fittings while the gauges are hooked up, so even the most obvious leaks from service fittings can get overlooked since it passed the "leak test". Great vid 👍🏼

[@Sid9397]

I just purchased the exact same micron gauge. Using HVAC tools and practices should be the future for automotive techs. I recommend automotive technicians that care to go the extra mile should begin to watch ( as I have done) t lech you tube channel. he does an awesome job of showing us what we have been doing incorrectly and how to do automotive A/C correctly and what tools to use. He uses Field Piece tools ( top of the line) which some of us cannot justify, but I recommend watching EVERY video he posts. I am excited to finally learn how things should be done and plan to use Tom's techniques in the future. Thanks again Scanner Danner . Great Video!!!

[@SchrodingersBox]

Catching up on some scannerdanner videos lately and glad I saw this one. I have always just vacuum-decay tested AC systems before recharging them but not anymore!!! That was a eye opener. By the way along the lines of ‘hygroscopic’- here is another one: that phenomenon when the angle at which you look at the gauge changes is called “parallax error”.

[@ScannerDanner]

Nice! Thanks Matt! Hope all is well with you

[@Paul1958R]

Caleb/Paul, Great video and teaching - thank you! Paul (in MA)

[@nathank1284]

Auto cooling solutions is a life saver company for a/c lines

[@ttstang43]

Man, Paul you are the effin man dude!! this video really resonates!! it cant be stressed enough, you learn everyday and any issue like this is nothing but a learning experience!! if it doesnt make someone a better person for it.. then idk lol

[@7minnow]

Nice job Mr Paul

[@chekelley6861]

On vehicles that old I ALWAYS tell the customer that’s it’s most likely other components are going to fail after an original repair is done. Many shops won’t touch vehicles over a certain age. Like pre OBD2.

[@frankhickman6356]

Paul, A couple things. 1st, We always did 80% on R134A conversion from R12. Never had a problem. 2 nd, Think of it like this. To vacuum 29 inches of vacuum is as good as you can get on this planet. Is like sucking thru a straw , then you put over 200 lbs of pressure in that system. If there is a leak in there you will find it. I have and use 3 different electronic leak detectors that I use on every job. If you have a leak in the evaporator you can't find it with out one. (Unless you take it apart to look) One more thing is any car or truck made before 1988 the hoses are made with different material. because the molecules are smaller in R134A than those of R12, so they leak easier. After 1988 the hoses were made different. Sounds dumb but true. Everyone does stuff different, that's ok. It's the end results that count. This is like any auto repair, They are all different, even 2 same cars and same repairs. Good job. ( I have been working on cars and trucks over 50 years. I would guess over 1000 AC jobs)

[@nicknicu1787]

Love the zip tie mod bro 😃

[@drainswamp394]

As a backyard mechanic-I had never done A/C repairs. My daughter's 2005 Sorento AC died-the high-pressure valve on the AC Compressor kept blowing out high jet sound noise. I watched about 8 of your AC videos on repair. So, I went to a salvage yard and bought fairly new compressor, condenser, and I bought a new expansion valve online, and a manifold gauge set. and replaced all. By following your AC repair videos I was able to get the cold air out of the vents at 39 F. I saved big money. I bet it would have cost me over a thousand dollars at a shop. Thanks a million. I learn a lot. I'm trying to get my daughter to sign up with your courses online. I'm still waiting on Caleb to start making repair videos on his own CalebDanner web site : )

[@ScannerDanner]

This is so awesome! Thanks for sharing this with me. Hope to see your daughter on board some day too

[@spelunkerd]

Thanks for posting this one, I always like to to see the misadventures.

[@waynecostanza2280]

Next time put the micron gauge right on the pump to check pump condition and ultimate pull down. Those hoses and your manifold are full of moisture and oil which will prevent you from pulling a deep vacuum. Best way to pull vacuum is without a manifold and hoses.

[@gautorepair]

A system might hold vaccum but not pressure. And it might not hold vaccum but hold pressure. I use the vacuum decay test to get an idea if i may have an issue with leaks. After watching this im thinking of investing in a similar setup to also pressure test ac systems. Thanks always enjoy your videos.

[@jake-mv5oi]

I found a rebuild kit for my wife's 95 grand cherokee that had those compressor head o-rings. The old ones were flattened like the one you found on the condenser still holding pressure a year later.

[@vw_mods_4711]

Great video, very entertaining you have great energy! One thing I noticed, fitting the micron gauge that far away from the the service valves on the car will not give you a true reading, you will be getting decay from the 1/4 hoses to the valves, you are more than likely just reading the vacuum from the pump not the system. I put my gauge right at the service port using a vacuum rated valve core removal tool, if you use 2 you can valve the vacuum gauge off from the system to avoid filling it will oil. this gives the best indication of what’s happening in the system, as it’s right on it. I find it hard to believe the vacuum pump and set up you have will see it get to 490 microns in such a short time. I use a twin 1/2” hose direct set up and it took 15 mins to get to 500 microns. Takes about 1 hour using 1 hose and that’s only if the system is in good condition. I have a short vid if you wanna check out how I roll. Just trying to help not trying to be a d**k I am learning a few tricks from you also. Much love from the uk 👊👊👊

[@Pablo_Automotive]

Thanks a lot again team Danner for share

[@stupa55]

Reminds me of my wifes car ac repair. First condenser leak, changed that with a new one, new o rings worked for a day. Pressure tested it and it started to leak from other o Ring. Changed them and all looked good. After 3 days system was empty again and compressor had a leak. After that she doesn't wanted to do any further repair on the system :-) it's really a nightmare to get on old cars a broken ac system back to life. It starts to leak everywhere. I know the nightmare you been thought with this ac problem and I feel your frustration 😒 still a very good video .

[@GeminiSeven43]

Great video Paul and Caleb and compression fittings are interesting in that they make a leak free connection yet can be taken apart and the Ferrule will still rotate. Once the ferrule digs into the tube then it is permanent and when the nut is tightened it is like any flare fitting. Compression fittings Rock and the only thing I would try to do is make sure you have your inlet and out let fittings set as close as possible to lined up as possible as you do not want a twist in the line that with vibration might loosen the fitting over time. It is a shame that the older AC lines are no longer available even for repair and I am curious if you might find a repair source on the hydraulic industry side as they have all sorts of fittings and hoses that are rated more than high enough for refrigeration. Thanks so much for taking us with you on this journey. So Sorry about the compressor and even if you can't find the seals a reputable AC shop might have better luck resealing it for you.

[@waynetyson3951]

Excellent video 👌👌👌

[@cardiaglexia995]

Hallo paul, deine videos sind sehr interessant.leitungen , welche nicht bestellbar sind lasse ich reparieren.ist oftmals günstiger als neu.dir & deiner familie alles gute & gesundheit.lg.aus ostdeutschland.

[@ZoomAutoDiag]

I wish it was 2002 and I could learn everything I learned in the past few years back then! Lol. Great video Paul. This was a can of worm. I try to warn folks of issues that could be existing that I can't see until we make necessary repairs to see them other things but I don't always get to give that warning due to many things on my plate. Anyways, thanks for all you do. ~Jeremiah Gilpin

[@HotRod-wv4vm]

Thanks for the video

[@mypony7310]

I had the same thing in my shop. The later sprung leak was an evap core..... It was a mess but i did bring it up before the repair. The system sat for a few years empty. The customer completely understood and we replaced the parts and sent him down the road.

[@gary00832]

I’ve got the same manifold set, I over paid big time but needed it

[@Alain.Helstroffer01]

Hi Paul ! I have an idea. You can certainly found leaks with a stethoscope for cars. Have a nice day (from France) ! Thanks for your videos !

[@cdars1]

I love how logical you are,who df is gonna change all those O-Rings they are certainly cheap in USA not cheap in Barbados,we usually have to fix part by part till its right lol

[@dhoagland3rdgen]

EXCELLENT!!! It takes both tests. I discovered Nitrogen back in the mid 90's and completely lost all trust in vacuum tests. Absolutely swear by nitrogen and it never let me down until last year... Long story short I had a leaking compressor seal that would seal when you "blasted" it with nitrogen. Friend of mine told me compressor seal, I didn't believe it. So I stuck a stethoscope down by the clutch and had a helper very SLOWLY apply the nitrogen. I'll be damn, I heard a hiss under 30 psi nitrogen and it disappeared at about 90... At 36 years of doing this, I learned something. I'm guessing the micron gauge would have been great here. But that got ride of my bad attitude toward the vacuum testing. And for anyone reading. NO, there was no evidence of a leak. Supposedly it had been filled with dye before and no trace with a black light.

[@ScannerDanner]

Bad ass, so the opposite! Vacuum caught it while psi didn't right?

[@dhoagland3rdgen]

@@ScannerDanner Yes.

[@ScannerDanner]

@@dhoagland3rdgen totally bringing that up on my next AC repair. I won't remember your name when that happens, just know it was influenced by you. Shaft seal that would leak under low psi only, seals under a nitrogen check and leaked during a vacuum decay test. Did I get that right?

[@terryharvey4811]

@@ScannerDanner No, he said he heard it at 30 psi and it went away at 90 psi. As for dye, unless you pull the clutch you may well not see dye traces outside the clutch area on a slow leak. This is where I tape a plastic bag around the nose of the compressor, leave overnight, and cut a hole in the lower part of the bag and do a sniffer check, Caught several slow leaks this way. This is using a small charge of R134a to leak check with.

[@Mr2004MCSS]

I have a Robinair 15600 vacuum pump and it has an isolation valve on it that can be opened and closed so you don't have to unscrew the yellow line to preserve the vacuum in it. You just close the valve on the pump. The owner's manual for my pump says to change the oil after every use and that is what I've done since 2006 when I bought the pump new. It gets expensive since a gallon of the Robinair oil is about $36 these days but the pump still works like new so I guess it's been worth it. The issues that you have run into on this old of a car is why when I have repaired the systems on my 92 cavalier and my 98 Chevy trucks, I replaced pretty much all of the hoses and components in the system. I initially didn't replace the one line that was partially rubber on the Cavalier but it lasted about 12 years before the aluminum mounting connection at the compressor warped and wouldn't seal. Luckily I could still get a replacement and replaced it. On the two 98 chevy trucks, I replaced everything in the system including all lines but not the evaporators and both systems have been working for around 12 and 15 years respectively and still ice cold. Great video as usual.

[@geneallison6980]

I really enjoyed the video,it was great,alot of information,thanks

[@ScannerDanner]

Glad you enjoyed it!

[@danman9017]

very good video thanks

[@markcarpenter3600]

When spraying a hose look for the little dimples in the hose, spaced about 1" apart. All AC hoses including your service hoses have them if a hose itself is going to leak that's where they will leak. I replace the drier/accumulator and easy o-rings. If it's 20+ years old all hoses get replaced. Oil in the vacuum gauge is easy removed with alcohol. Always pressurize the system before pulling a vacuum. While vacuuming the system rotate the compressor by hand if the clutch allows.

[@hometownautorepair3121]

Great Video Paul !Ever since you taught me years ago to pressurize with shop air I’ve stuck to it and it hasn’t failed me , if I Drop more than 1 pound within 15m there’s always a leak! I never use Vacuum test anymore I get burned every time

[@Geekdiymechanic]

What adapters do you use to go from shop air to ac port? Thanks ahead of time.

[@user-te3pn4pb4u]

never ever use shop air!!!!! you are injecting water into the system and drier. now you use a micron gauge when you vacum and you will see how much moisture you injected and may take 8hrs to 2 days to get it out but some times people want change their ways so sad

[@Bwelsh1981]

I hear you when it comes to improvising on NON avaliable parts brother . I know all too much about it. It sucks

[@TrevAutoTech]

If it were me I would explain to the customer exactly how you explained it and give them the option to continue putting money in it or they could have a refund on the initial repair we did. I would not be doing any further free work due to the fact like you said its not our fault. 86. Old as me....and it's my birthday lol

[@hotrodpaully1]

One thing I do on all AC jobs is replace the Schrader valves on both service ports. I don't know how many times everything was good until you removed your hoses and the service ports would leak. They are replaced without question anymore.

[@albertomorales9493]

Awesome video. A ++++++ I have a Datsun 280ZX 1983 which is going back on the road with AC..... thanks

[@The_Redkween]

I use Swagelok compression fittings all day long at work, that have held upwards of 1000psi for years, and you can take them apart and put them back together with no issues. There’s just a different tightening spec for first-time use ferrules and used ferrules.

[@cullenmiller8170]

For that reason a lot of shops won’t touch that car. To old you look at plastics funny and they turn to dust. Your customers dream cars can be your worst nightmares. I used to work on a lot of old Mercedes and I had an understanding with my customers that I will do the best work I can, but they still have a car that is 40+ years old and we aren’t doing a full restoration. I pretty much turned three out of five customers away for either not knowing them, no referral from existing customer or my gut just telling me to run.

[@thecuss6817]

My 1998 Frontier got a pinhole in its high pressure line on a 119F Arizona day. The line had been discontinued by Nissan but an aftermarket line is available, same part sold at all the parts stores, and had good reviews. However the fitting into the compressor on the replacement line was 5.5mm longer than on the factory part; fortunately the O-ring groove was at the equivalent location, and I was just able to cut 5.5mm off the replacement fitting, and it's performed well for 4 years now. After I checked/ordered a second one to compare (same) I did call the supplier in Texas, and even sent a comparison photo, and I was told they'd never heard of this before.

[@emceecoldharted2419]

That makes a lot of sense because I’ve seen plenty of times where a car came in with the ac inoperative, we recover the systems and find that it was low on refrigerant but didn’t leak when we put it under vacuum. We know that the ac CANT be low if there’s no leak so I always found that’s weird until now

[@mph5896]

Auto cooling solutions. They are in flint mi metro area. I flipped a couple houses down the street from them. They sell a bunch of rear ac line retrofits for suvs.

[@shanestrains2849]

Had a buick enclave charged with 120psi of shop air, had a broken front motor mount which broke the discharge hose at the ac compressor. You could only hear the leak hiss out like crazy when you rocked the motor back and forth via pushing on the front end 😃

[@andywrites2141]

I have gate valves on the bottom of my hoses to serve as my check valves. Also allows me to close the hoses off before removal.

[@randomfishingguy5573]

2 thoughts On this situation. First is about communicating expectations to the customer very clearly. Define exactly what you are fixing and what else could be affected by the fix. Second is also trusting your techs assuming they are good guys. If they say it wasn’t leaking. Then it wasn’t leaking. Service managers that don’t trust or believe their own techs really kills morale in the shop

[@ScannerDanner]

100%

[@bruceirvine3962]

Had a 97 Grand Caravan. In 2002, lost AC. Replaced evap, condenser, dryer and compressor for $2500. Blew cold for 16 more years when I finally sold it. No regrets on spending what it needed.

[@theadmiral5425]

I've always pressurized systems to check for leaks and after repairs, although I will admit I mostly used air in the beginning...now I use N.

[@rpsmith]

Always pressure test first! If that holds, it's time for the vacuum pump and micron gauged. Also, there is a right and a wrong way to us a crescent wrench and it has to do with one jaw being movable and therefore weaker!

[@Retroranger77]

My experience with any system (A/C, hydraulic, cooling, etc) is to test it under the conditions it normally operates at, be it pressure or vacuum. Too many times I’ve been bitten by a misreading by testing in an abnormal condition to what the system will normally see.

[@throttlebottle5906]

the old lines are often dry-rotted and stress cracked, so if it's been years without pressure/operation, they could easily break apart and start leaking when put back in under pressure and use. especially the high side and nearest the compressor where heat and vibration radiates through the hard tubing, even the low side will break often at that joint.

[@jdray6834]

The gauge seems to be helpful but I'm not finding one to T in to a r134a machine. That being said is it primarily used for commercial ac work? Always double check with nitrogen pressure drop for this reason.

[@howlinhog]

Great example of why I prefer automatic transmission repair. When I rebuild your transmission, every component of it lays in front of me on the bench. I get to inspect everything! I replace every electrical component (except the PCM) and every hard part is thoroughly inspected. Which brings me to a fiasco of misunderstanding and court. I had a lady come in with her Taurus, It's been 30 years ago so I can't remember the details. I think it came in with no reverse, and then about 8 months later, no third. I have a warranty of 12mos 12,000 and 6mos 6,000 for commercial. Anyways, the lady had no money and burst into tears when I gave her an estimate for rebuild. I felt bad and told her I would only fix what's wrong with it for a considerably lower price. I told her that the warranty only applied to complete overhauls! Job done; on her way she goes. Months later she is back with a different failure and wants me to fix it for free. I remind her that it wasn't overhauled, and the warranty didn't apply. She takes me to court, and I forgot to go. I lose by default and have to pay her back. End of story, lesson learned.

[@richardcranium5839]

years ago you could get the nylon lined low permiability hose for r410 at napa and just carefully cut the old crush sleeve and hose off and replace it.

[@lasallj03]

I wish I had a teacher like you