How to Pull a Vacuum and Recharge Your AC System - ULTIMATE GUIDE - HVAC
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- Опубликовано: 5 июн 2024
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[AC Manifold Gauges] - Both work great!
AURELIO TECH 3 Way A/C Diagnostic Manifold Gauge Set, Fits R134A R12 R22 and R502 Refrigerants, with 5FT Hose, Acme Tank Adapters, Adjustable Couplers and Can Tap: amzn.to/3xQLwHi
Lichamp AC Manifold Gauge Set with Self Sealing Can Tap, All-in-One AC Gauge Set for R134 R12 R22 R502 Refrigerants: amzn.to/3wEbH2D
[Refrigerant]
R134a Refrigerant 12oz Can - Pack of 1 (PLAIN - GOOD!): amzn.to/39FwtJS
R134a Refrigerant 12oz Can - Pack of 3 (PLAIN - GOOD!): amzn.to/43yToMH
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R134a - Johnsen's 6313 R134a Refrigerant 12oz, Pack of 3 (with UV Dye - GOOD!): amzn.to/3hCGtF5
Sorry no links for r1234yf
R12 is now banned for sale. No links.
[Refrigerant Dispenser]
R134A Can Tap Refrigerant Dispenser with Tank Adapter, 1/4" SAE Female to 1/2" ACME Tap: amzn.to/3b9yOgx
[AC Vacuum Pump - For Pulling a Vacuum]
Vacuum Pump 3 CFM 1/4HP Air Conditioner Refrigerant HVAC (CHEAP!): amzn.to/3yRAuBZ
Vacuum Pump 5 CFM 1/2HP Air Conditioner Refrigerant HVAC (CHEAP!): amzn.to/36yvSEz
[For AC Leak Detection]
UV DYE ONLY - InterDynamics Certified AC Pro Car Air Conditioner Leak Detector Dye: amzn.to/3km0QrT
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UV FLASHLIGHT + UV ENHANCING GLASSES - amzn.to/3BIPa8R
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Refrigerant Leak Detector - Good Quality: amzn.to/3zG4FML
[Crocodile Clips - For Jumping the Clutch Relay]
10 Pieces and 5 Colors Test Lead Set & Alligator Clips, 20.5 inches: amzn.to/3efS4rq
[AC Pro - No Manifold Guages Required to Re-Fill]
AC Pro Car Air Conditioner Synthetic R134A Refrigerant, AC Recharge Kit with Hose and Gauge, 20 Oz, ACP200-6: amzn.to/3wGW3DE
[Digital Scale - For Weighing Refrigerant]
Digital Scale (Cheap!): amzn.to/3y8Is9D
[PAG Oil - For AC Compressors/Systems Requiring PAG Oil]
PAG Oil (WITH UV Dye): amzn.to/3OL6NdV
PAG Oil (Plain): amzn.to/3OrZ5F5
[Misc Tools]
U-Joint Set: 1/4", 3/8" and 1/2" Drive: amzn.to/3ambTvs
9pc Socket Extension Set: 1/4", 3/8" and 1/2" Drive: amzn.to/3pnvQGz
Metric Wrench Set 8mm - 22mm: amzn.to/2xQn3ot
Socket Set 123pc Metric and Imperial - Good Quality: amzn.to/2NhqhL9
Socket Set Metric/SAE 23pc - Good Quality: amzn.to/3OuUHVS
**** United Kingdom Purchase Links ****
A/C Manifold Gauge Set: amzn.to/3Q6ygdM
R134a Refrigerant 12oz 1pc: amzn.to/3DnoU5H
R134a Refrigerant 12oz 3pc: amzn.to/3rGlmsY
Vacuum Pump 3CFM: amzn.to/43u2Wss
COMPLETE KIT - EVERYTHING YOU NEED: amzn.to/44BPqo0
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Chapters
0:00 Intro
1:20 Connecting the AC Manifold Gauges
2:30 Vacuum Pump Setup 1
3:33 A Note on PAG Oil
5:32 Vacuum Pump Setup 2
7:26 Pulling a Vacuum 1
9:18 Preparing the Refrigerant 1
10:56 Pulling a Vacuum 2
11:48 Preparing the Refrigerant 2
14:38 Preparing for Recharge
17:53 Recharging the AC System 1
19:10 Jumping the AC Compressor Clutch Relay
21:33 Recharging the AC System 2
24:37 Final Notes
Instagram: / tutorialgenius
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How to Pull a Vacuum and Recharge Your AC System - ULTIMATE GUIDE - HVAC
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Video Title: How to Pull a Vacuum and Recharge Your AC System - ULTIMATE GUIDE - HVAC
Video File Created Date: 26 July 2021 (Video may or may not have been captured on this date, it shows the date the video was last converted.)
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Video Tags:
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Thanks for watching!
Very well done
Wow and you're supposed to be some kind of a mechanic I'll tell you you're not you're an idiot for 1 you do not Teflon tape Flair or compression fittings ever ever ever only time of use teflon tape is on a tapered pipe fitting that makes you a real dummy I'll finish watching your video but you get a big thumbs down for being a dummy basic Plumbing
Thanks for the video and specially for the clarification about pump oil and AC oil just bought a pump and came with that oil I really thought using that oil for Ac
Will that gauge and vacuum pump work my heatpump in my home as well?
This guy should have 1 million subscribers already. Your video was so descriptive I feel confident pulling a vacuum and recharging my air conditioning system. Thank you for taking the time to list the items in the video with links. You are the man!
You're welcome! Thanks for watching and the kind comments! I really appreciate it a lot
Nice work! And you included the critical step of purging the air from the service line (yellow hose) and how to deal with the compressor that won't kick on due to the low pressure switch. Bravo.
Glad it helped! Thanks for watching! :)
I've been watching videos on this topic ALL DAY while I've been working on this vehicle and this video is BY FAR, the clearest, most informative and concise one. Many thanks
Cheers
You're welcome! :) I noticed a similar thing so I figured I should make a thorough video explaining it all better! Glad it helped!
@@TutorialGenius
Thank you for your time, much appreciated!! 👍👍
I agree... extremely infrmative and clear!
Thanks man. I think a lot of us appreciate the amount of detail you included in your explanation of how to vacuum and recharge an auto ac system.
You're welcome! Thank you for the kind comments 🙂
After watching a number of videos, you are the first to tell me that when I am drawing a vacuum, I do not draw off the PAG oil. THANK YOU. I evacuated my system (during the removal of the secondary rear HVAC unit) and wanted to know if I needed to put more oil in the front system during recharging. I bought the vacuum pump as well as the gauges and pulled the vacuum to test for system integrity and extended the vacuum time to ensure complete removal of water (since the system had been opened when ancillary pipes were removed).
I'm glad it was useful! :) Yeah, many of the videos on here kinda suck, or at least, don't go into too much detail, so that's why I decided to make my own! Glad you liked it!
I’ve watched a lot of theses as I’m going to change the condenser as holed , your vide is by far the best I’ve seen, manny thanks 👍
Glad it helped! I hope you subscribe to my channel soon! :)
What a thorough and concise tutorial! I'm impressed. Very impressed. You didn't miss a thing. I just had to subscribe.
Glad it was helpful! Thank you for the kind comments! :)
I have to thank you for all of your videos on repairing the AC system on a Saturn Vue. I have a 2006 Saturn Vue, 3.5L V6. Thanks to your videos, I was able to replace the condenser, compressor, dryer and expansion valve and vacuum/recharge my system. My AC is working better than ever! As a side note, I wish I would have found your video about replacing the scroll valve earlier. It would have saved replacing the other components. Thanks SO much again for all of your work and time with your videos. It is GREATLY appreciated out here!
You're welcome! I'm glad its working great at least!
Good morning family and thank you very much for the valuable information and for your time. 👍🏼👍🏼
Great tip jumping the compressor... thank you!
very professional. clear vocals, great camera work thanks a lot my man..great job
Glad you enjoyed it! Thank you for the kind comments! :)
No nonsense factual tutorial. Dude you are a genius!
I'm glad it helped! :)
Amazing tutorial, thank you very much. Followed all your points and got my AC running like new. Again thank you so much.
Glad it helped! :)
This is great ! ! 😃👍 You’ve taken the mystery out of working on the ac.
I'm glad the video was useful! :) Thanks for watching!
Thank you! Very thorough and direct with no “captain obvious” over narration. I was unsure about doing this myself until I saw this!
Thank you for the kind comments! Good luck with your project! I'm sure it'll go smoothy!
This video, for want of a better word, is priceless! Thank you to you sir!
Glad it was helpful! :)
You're a natural ...one of the best on the topic
Thanks for the kind comments! :)
Thank you for taking the time too provide a very educational, meaningful overview of AC.. working on my Honda's, videos like yours help understand and contribute to a successful repair
Thanks great to hear! Thank you for your kind comments
Really a good tutorial.....very detailed and great step by step description. Thank you.
You're very welcome!
You are the man I followed your directions and it worked like a champ hopefully the charge will hold. I put new o-rings in the high and low side compressor ports on the Subaru. Supposedly it's a known failure point.
The only comment I have I think that stuff looks like smoke is coming out of the vacuum pump I think that's moisture just getting sucked out of a system.
I played around with it for a little while every time I introduced air into the system and then drew a vacuum on it I saw the smoke come out of the vacuum pump.
Great, im glad it worked out!
The smoke you talk about, I believe I already mentioned this in the video, if its a new vacuum pump, its normal
Great Video. Thanks for doing this. Helped me much...watched it twice. Done it before but been some years. Nice refresher. :)
Glad it helped! :) I hope you subscribe to my channel soon! :)
great video very smooth and informative
This is THE #1 BEST car A.C. video [out of 80 AC videos that I have viewed]. I have charged my cars' refrigerant about 20 times, but was reluctant to try to use a vacuum device until viewing your video. Your video is BY FAR, the clearest, most informative and concise one that I have seen. I greatly appreciate that your descriptions were simple enough for novice users. Thank you for all your time to create the video [preparation, filming and fabulous editing].
That's great! Thank you for the feedback. I definitely gives me motivation to keep going! :) Hope you have a good Christmas holiday this year ☃️
Excellent vid and instruction. Thanks so much for taking the time to produce it.
My pleasure! I'm glad it was helpful!
Incredible video, mate! So much attention to detail. No idea why there aren't hoards of subscribers. You wouldn't happen to be from Zimbabwe, originally, yeah?
Thanks for the kind comments! Slowly but surely getting momentum here on RUclips. It's a long and painstaking process, but maybe i'll get there in the end :)
Never been to Zimbabwe, but I have fancied visiting South Africa; I was going to go this year
Hey buddy thank you for that video you absolutely deserve a million dollars very detailed explain everything that makes sense to the commoner and you took your time. And you showed some scenarios. That we could try to troubleshoot. but at the enf of the day. You did a h*** of a job with the video. Thanks man.
I'm glad it was useful! Good luck with your project! (I'm assuming you have one to do soon!). :)
Hello my name is Bill from Medford Southern Oregon this guy is absolute telling you the truth this the way you do it 12 years I'm in AC so I know he's right yeah yeah kudos kudos brother
Thanks buddy!
Flare fittings don't need teflon tape. The seal is only between the two, angled mating surfaces.
FLARE fittings, yes correct, but, not ALL gauges have flare fittings ;)
I've never seen any that DIDN'T.
Yours obviously do.
That's interesting! Spend some time in the field and you will!@@RollerCam
11 years as a factory mechanic at a So Cal dealership wasn't enough to attain your level of knowledge, it appears. 😐
Yep, and the video poster clearly keeps tapping the threaded portion of the fitting indicating that it's the threads that need taping and this is patent nonsense (just like all the idiot plumbers out there who insist on clarting compression fitting threads with tape, too! Not to mention equally gormless people who tighten o-ring-sealed joints with a bloody spanner! Utterly pointless...)
Educational... Thank you for taking the time to upload this video👍👍
My pleasure! :)
Excellent presentation. I'm sure the presenter is on the A/c mechanics hit list. Watch your back.
The video was made in response to a $2200 quote. This is already the revenge! 😆💯
Best video on this topic on all of RUclips.
Glad it helped! :) Thanks for the kind words!
Well great step by step slow pace video for us 101 rookies lol...
So now I know how to charge it back !!!!! I will now look for your extraction video process, hopefully it's this clear also cause it's my first time doing this and im not to confident messing with pressure tanks and machines!!! 😅 Even though I definitely do mecanic work... thakx again
Glad it helped! 💥😊
Dang. I've never seen a better description of charging a/c.
Thanks much!!
I'd give you two thumbs up, but RUclips only allows one....
Thanks! 🔥😊
That was a very well made informative video sir 👍🏼👍🏼👍🏼👍🏼👍🏼thank you.
You're welcome!
Thanks for the lesson. Well done. It's just what I was looking for.
You are welcome! :)
Great video. Very concise. Thanks
You're welcome! Glad it was helpful! :)
Great and very detailed video - you saved my day!
You're welcome!
When you get ready to refill your system before you start the car go ahead and purge your valve after you hook your freon to your hose and then go ahead and start to refill your system your system will take the freon without the car running!! If the freon don't want to start coming out get a pan or small bucket and put hot water in it and then set the can of freon down in the hot water and it will immediately start coming out. But you can start to put at least one can in your system before you start your car and that away your compressor will come on when you start your car and that away you don't have to go messing around with relays and fuse and things like that Hope this helps
I think you are trying a liquid charge on the high side .
@@TutorialGeniusone can before starting is definitely easier
One can! True! But what about toucan? @@nclivin4220
@@TutorialGenius toucan 😂😂😂
@@TutorialGenius My van is 52oz. but that info is from Google so I don't trust it. What's a good source for info on this subject?
many thanks! First video I have seen that explained why I couldn't get the freon in the system (I didn't know that all the way screwed in AND out meant the can was closed!)
You're welcome! ☺
@10:25 Thank you for showing how to use the Adapter in all the details.
You're welcome!! :)
Great Video! Thank you very much!
I don’t think this guy did not miss one thing I’m getting ready to do exactly all of that as we speak but I think all videos help a lot of us. I know I get a lot more out of watching then I actually do reading or a diagram. And especially if you have ADHD very helpful
Thank you for the kind comments!
I like to teach in a way that I would understand, so I guess we are the same type of learner!
Good luck with the project! :)
That was a great tutorial! Thank you
You're welcome!
An outstanding video. Thank you!
Glad you enjoyed it! :) Thanks for watching!
Very nice demo - thanks!
My pleasure! I hope it was useful!
Great video. Precise info. Thanks.
You're welcome! :)
Your excellent explanation I like attending school. Good job
Thank you! 😃
I haven't checked your channel out completely, but have you done a video on evacuating the A/C system? I am looking to replace my compressor as it has failed (the clutch went out, and currently I'm bypassing my compressor to have my car at least running) and I want to replace it myself. Many thanks for the A/C recharge tutorial, very descriptive and informative, you've earned my support! Cheers.
Not yet! But I plan on doing this to a Mustang soon!
Replace parts like: Accumulators, receiver driers, lines and hoses with filters and mufflers (They cannot be flushed.). same with modern condensers as the passageways are too small for flushing.
A flush kit is really useful (Match the kit to the refrigerant type), connect it to a compressor and it becomes easy to flush lines. Like this one: amzn.to/40mkvd9
Then you need to be careful about restoring the PAG oil. Some new components come with oil, some do not. So its important to check you have the right amount in the system after all is said and done.
(The manual will tell you what needs replacing AND how much PAG and refrigerant the system holds.)
Then its just nuts and bolts
But yes, I plan on doing a video soon :) Perhaps after summertime as it's getting too hot too right now!
good explanation i like it
very nice job
Man, thanks for the video I learned something appreciated.
Glad to hear it!
You are so GOOD ! Good explaining .. Wow ! just wow
Thank you! 😊😊 I hope it was useful!!
The most complete service explained
You're welcome! Thanks for watching! :)
Great step by step video
You're welcome! :)
Thanks for the video. You're a good teacher
I appreciate that! :)
Great video, about to do this tomorrow. Thank you much
Good luck! How did it go?
@@TutorialGenius Man, got it done exactly how you demonstrated and that thing spits out pieces of ice 😂😂😂 Thanks for what you do. God bless you 🙏🏼😎
You're welcome! I hope you saved a bunch of $$$!@@luiscarrasquillo9743
absolutely great DIY video thanks a lot man
No problem 👍
great video and explanation really enjoyed it 👍
Glad you enjoyed it!
Looks like a really great job great video.
Thanks 👍
This should be renamed "ELI5 recharging your AC". Everything makes sense and I don't have to go research what is this or that now, 🙏👍 thanks
Thank you for this very detailed information
Glad it was helpful! :)
Excellent tutorial. I learned so much, that I actually think that I could do this. (Famous last words.)
You can do it!!! 😊💯💯
Very nice tutorial. Thank you very much.
Glad it was helpful! :)
Outstanding tutorial. Thank you.
Glad it was helpful!
Great video. Very informative.
Glad it was helpful!
Great tutorial! Thank you!
You're very welcome!
Hey bro thank you very much for the video. I followed step by step and now i jave my air back 👍 live in Florida and it is hot . Thanks again bro
Glad it helped 😊🔥🔥💯
Outstanding video!
Glad it was helpful! :)
What if it goes to 20 and stays there instead of below 30 when u vacuum the pressure? Great video!!
Under normal conditions, meaning the system is properly sealed, and the pump and gauge set are working correctly, vacuum should pull to 30” of vacuum within the first minute and hold while the pump is running. If the system doesn’t pull down to 30” of vacuum at all while the pump is running, there’s a significant leak preventing it from doing so, or there’s a problem with the pump.
Hey thanks for taking the time to share this video! However I got a question! Is possible to just top it off if the air is not cool enough? Without doing everything that you did?? Hopefully you reply, thanks in advance!
If the problem is low charge, then yes. Its good to get that diagnosis first :)
It is clear tutorial... thank you . I have a question...
For Honda Accord 2008 - 2012... because the condenser come with the receiver drier assembled into one.
How much we need to add the PAG oil.... when we replace the condenser that come with the receiver drier .
If you do not know a specific amount, in general how much usually AC technician add it.. thank you.
Check the manual, it'll say the amounts of make-up oil of each component. So just add the two together
I love those Honda engines in that Vue.
Same here! 🔥🔥😁
Great Video! When measuring the refrigerant weight for correct filling, how do you take account of the amount of refrigerant in the yellow pipe that was used to purge the pipe? Could a pipe load of refrigerant actually be quite a proportion of the specified amount, especially if it is in there as a liquid, rather than a gas, for pipe purging purposes? Or maybe the liquid refrigerant flows back into the canister under gravity before one opens the manifold to start filling, leaving only an insignificant amount of gas in the pipe? Or maybe you tare the canister once the pipe has been purged and then reconnect the canister?
Also, did you purge the yellow pipe in between canisters?
Thanks for any clarification given.
You don't need to worry about the pipe, I think you're over-thinking it. It's almost negligible.
The psi readings will tell you the pressures in your system, so go off those. Don't add x and y and hope its okay. If you add the 'correct' amount but it's slightly low on the readings, then add some more.
Yes, you should always do this: RE: "Also, did you purge the yellow pipe in between canisters?"
New subscriber excellent instruction video thank you very much. Artie 👍
Awesome, thank you!
Excellent video!
Thank you very much!
Hello. This is a useful video, thanks. I just have a question: the vacuum pump sucks the oil too, or the oil remains inside the compressor and A/C system? Thank You. Have a great day.
It won't suck the oil... I believe I already mentioned this in the video though
Your the third video that is great..i know fully understand the automobile AC system..im no longer afraid to work on my ac...my 99 chevy express, has zero freon..i shall repair my own..and save a bunch of money
Amazing! I'm glad it gave you the confidence! Thanks for watching :)
Thank you! My car is cool now
I know I’m late, but is that one of those special Honda/gm Saturns? That looks an awful lot like a j series Honda v6. If so super cool, and also, very informative video!!!!!! I’m a commercial tech for reefer and diesel apu’s. Your video is awesome! I needed to re look up my knowledge on cars as I need to recharge mine and my wife’s. Your video was great.
Great it was helpful! :)
Yep, it's hard to miss that Honda engine!
Thank you for the helpful video. I have replaced the entire AC system in my 1996 C1500. New compressor, accumulator, condenser, all new switches, every thing... I followed the steps here and even jump the compressor, however, I could not get the system to take the R134A. Can you advise? Thanks!
You either wasnt under negative vaccum and wasnt able to push any in. Or your low side hose didnt press the shrader down. If you had a vaccum and it stayed under vaccum you should have sucked the can down in 3 sec
My brother you are awesome 👌
Thanks for the kind comments! :)
Thanks for learning me😊
My pleasure 😊
I don’t add oil into the charge line as it will spray out when you purge your air but you can use a can of oil charge and add it to the low pressure side. I just drain and fill the compressor oil because I changed the compressor so I don’t add any oil.
No, you can't add a can of oil charge to the low pressure side this way (through the manifold gauge). I tried. Vacuum won't pull the oil up out of the can, and the hole between the yellow and blue lines is too small for the oil to get through in less than an hour.
@@philipgoetz8681 That's interesting because I just made a big boo boo. I opened the valve on the manifold gauge before i turned on my vacuum pump and the system sucked oil out of my vacuum pump. Now I have to find a way to remove all of the oil in my system as I have no idea where all the oil might have gone. I had just put new oil in my vacuum pump and after that happened it was no longer visible in the sight glass so I know it had to go in.
Thanks for your help! I’m servicing my ac system because the condenser was punctured during other engine work. For this situation, how much of the ac components should I replace? If I only need to replace the condenser, do I need to add ac oil before charging the system again?
Glad it helped!
Your manual will tell you. It will also tell you the make-up PAG oil amounts for each component.
Its different all for makes and models, but i believe I covered all of this in the video already
Excellent video
Glad you liked it! :)
Thank you for sharing it.
My pleasure!
Great video! Quick question, I had to remove the line from the compressor today to remove the engine and pressure air came out. Does that mean I need to vacuum and add Freon
?
The manual says you should also replace some AC components when this happens.
However, I didn't when I changed the scroll valve (I have a video on that), and it was fine.
But yes, you would need to vacuum and recharge 100%!
@@TutorialGenius Thank you for the quick reply. it’s very cold where i am at. Should i vacuum and add freon when it warms up again?
Does the oil poured into the compressor circulate throughout the system or do you need to put oil in the lines, dryer, condenser, evaporator separately?
Yes it will circulate! :)
Very Good. Thank you.😀
You're welcome! 😊👌
Hi, is the process you used in this video the way all air conditioners would be recharged provided of course that you can use a bullet piercing valve to create places to hook up the hoses?
I have only worked on my house AC unit a handful of times, but generally, the same principles apply, yes :)
Thank you sir!
Thanks for the vid!! Just one thing Im kind of confused about. I’m replacing the condenser on a BMW 335i. Will I need to pour pag oil into the condenser before reinstalling? And how much? Thanks!!
Yes you do, but I already covered this in the video
When you change a significant part of the system like a condenser or compressor you should be flushing the entire system after removing the compressor. This will eliminate all the oil except what is left in the compressor. Pour out the oil in the compressor into a measuring cup and subtract that value from what your manual says the total system oil capacity is. The difference will be what you will need to add to fill up the system. (Replace the same amount of new oil into the compressor and extra amount into the condenser or inject it into the line).
Great video
I'm glad it was useful! :)
@8:16 you left the cap on the vacuum pump exhaust while it was running. Isn't that bad? Also, my vacuum pump is very similar, and the manual says to take the cap off the oil inlet while it runs.
I have a doubt, please help me with that. I could see you did vacuum in both lines low and high but when you added the ac refrigerant you only opened the blue valve and my question is: the hight pressure line don't need to be filled with ac refrigerant? Or only the low pressure line has to be filled with ac refrigerant?
Appreciate you can helo to resolve my doubt.
Hi from Honduras....
I believe if you override the low pressure switch as opposed to the Ac clutch relay you could do the same thing even better than because your condenser fans will come on
Yeah but you cant reach the low pressure switch easily on some vehicles not all are the same
This guy is good at explaining. Does anyone know if he has a video on how to discharge the system b3fore doing this?
You only really have one option, take it to a garage and get it evacuated.
If anybody tells you to vent it into the atmosphere, then don't. They are just a scumbag who wants to save a few bucks at the expense of the environment.
@@TutorialGenius I was really hoping for a video on how to discharge the system myself because I am considering buying a Robinair Vacuum pump, Robinair RG3 recovery machine and a recovery tank to be able to do the A/C work on my own cars. Also I always have people that see me out working on my cars asking me if I could take a look at their cars A/C and willing to pay. (Location: Central Florida a.k.a Always Hot State and Need A/C to survive)
@@mercorey3258 Gotcha! To be honest, the manual for the recovery machine comes with will probably already tell you. It's quite simple. It's not as complex as potentially replacing parts and it doesn't use different tools and pieces of equipment like the re-charge process.
@11:09 if you see that there is a leak in the system (which is empty, no freon in it, as described in this film), can you add shop air into it to find that leak (by spraying soapy water on connections of AC system e.g.)? I've read or heard somewhere (I think in one of YT films on the subject), that you can not add shop air into the AC system, since it will be contaminated, but I don't see why as we can remove that air w/pump, when creating vacuum. Thank you for this so informative and detailed film.
Update: I found the leak, it was on the Compressor. I pressurized air like to 90 psi and started to try to look under the compressor, and here on the side felt some very light breeze on my hand, soapy water showed bubbles. It was on one seam of the Compressor.
you should try and limit how much air is let into the system. Air and moisture is the enemy of air conditioning systems. The oil in the system is hydroscopic and will absorb moisture and get contaminated, pulling a vacuum will not undo that. Moisture will saturate the drier in the system rendering it useless. A system can be pressurized with nitrogen or CO2 for leak testing, a trace refrigerant can also be added to use an electronic refrigerant leak detector. Adding compressed air can also be hazardous. The refrigerant and oil is not usually very flammable or explosive, but when put into a pressurized environment with oxygen it can be.
@@Redtooth75 Thank you very much for you replay and pointing out on hydroscopic properties of the PAG oil. I thought it is only air which has the water, and deep vacuum takes care of it. Anyway, I pressurized the system that way already, and found a huge leak on Expansion Valve-to-Evaporator connection. It was hissing, and you could hear it w/no additional devices. It was a wrong o-ring, which came w/the Exp. Valve set. I put a thicker o-ring on the bottom tube (3/32"), and the huge leak stopped. But still there is a small leak somewhere. I pressurized again (30-50 psi), spraying w/soapy water - nothing. But the pressure goes down on your eyes, you can see it, slowly, but drops. It was me, who did something wrong and I can't find it. The system was leaking of course, but much much less. Originally it was empty (the car was w/no AC for 10 years, it is our back up car and we didn't worry much). I tried to fix it at Dealer, but after their several attempts it still failed like after 2 weeks. But the system was working for 2 weeks and after I tried it after 10 years pressing the Schrader valve (I wanted to be sure that there is no refrigerant there, though the gauges showed zero) w/a small flat, it gave that 1 second "pshik" sound. I replaced everything besides Evaporator, Compressor and Liquid Line (it is Expansion Valve -to- Drier Line). Liquid Line I couldn't find for that car, Evaporator is to hard to get to, and the Compressor didn't stall the car before, so I decided to try it. So I flushed the Evaporator and Liquid Line well, several times w/99% Isopropyl Alcohol, then w/Flush Fluid, dried for several days. The Compressor I removed flushed and dried in the same way. I added PAG100 oil, put all the new o-rings and washers, torqued to specs (I have Shop Manual for that car). So in the future I can repeat all that flushing, put new oil, and everything, it is not a problem, but I do need to find that small leak somehow. Do you happen know what can be done at this point? Thank you again.
@@olenaerhardt7725sometimes the most common leaks are the Schrader valves themselves. These can be replaced also and then you may not have a leak anymore if you can't find it anywhere else.
@@NealHartsChannel Thank you for your concern, I'm sorry I didn't write update on my comment. The Schrader Valves were possible of course, but not very likely in my case, since I replaced all the lives, besides the Liquid Line (Expansion Valve-to-Drier, I couldn't find it anywhere, and it is the most complicated to replace). I found the leak, it was on the Compressor. I pressurized air like to 90 psi and started to try to look under the compressor, and here on the side felt some very light breeze on my hand, soapy water showed bubbles. It was on one seam of the Compressor. Thank you again.
Shop air will contain quite a bit of moisture, spray it on a board and you will see the mist. (Unless you have a oil/water separator on your air line) so directly adding water will be bad for the oil in the system and in newer condensers the veins are so small you will never get that water out. Nitrogen is dry so it will not soak your system in moisture. C02 is acidic and a solvent so it may cause issues with seals. Nitrogen is inert and will not react with anything so preferably use nitrogen
Wow, great video, thumbs up! One note, at 6:04 you said to use teflon tape on the pump threads, but actually that doesn't help at all, could even make it worse. Any time your threads are on brass piece attached to a hose, and they spin independent of the hose (same as a garden hose) then the washer or o-ring or rubber seal inside the hose does 100% of the sealing. Threads do zero% of the sealing because gas/air/water could just escape out the top where the threads attach to the hose and spin separate from it. The job of the threads is only to pull tight on the seal that is already there, and adding teflon just makes it harder for the threads to do their job.
It's to do with the fitting, not the material type. (I.e. brass)
IF you have a flare fitting, don't use it. Because the connector won't bottom out, and it CAN leak (Not always)
IF you don't, then use it.
Doing ac in my truck right now with this video. So you leave the high side gauge valves closed at all times correct????
Some parts of the process you will need to read the gauges on the low and high side. Everything is explained in the video in a lot of detail