How to Vacuum Down and Recharge Your A/C System! - EASY
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- Опубликовано: 30 май 2024
- Today we are showing you exactly how to vacuum down and recharge an air conditioning system. This is a comprehensive video that will teach you precisely how to service an A/C system in your car or truck. In this video is full lesson on to service an automotive A/C system for free.
The formula for the high side pressure is to take the current outside ambient temperature and times it by 2.2 Therefore if it's say 100 deg that day you would be at roughly 220 psi on the high side gauge. If it's a cooler day say 75 deg then times 2.2 would be 165 psi for the high side gauge.
There is a fair amount to this process so if you have any questions leave them below or head over to our website www.2CarPros.com and ask a question for free. Thank you so much for watching!
Low Side Finding Video: • How to Find the Low Si...
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R134a Refrigerant: amzn.to/2QgkiFX
A/C Leak Sniffer: amzn.to/31mS2rD
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*Disclaimer: Please use all safety precautions 
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I've been a formerly certified mechanic for a mere 20 years now(started with my dad, to a business and now on my own).I've been telling people I know jack smack about HVAC on a vehicle. I couldn't take it anymore. Watched this video all the way. Now I can add a new extremely basic service for ac recharges. We are in Texas, AC is year round these days except for 2 months. Thank you sir. This is a blessing from God and you shared your bread with others. I'll cherish it.
Awesome! Thanks for watching!
@@2carprosnmnbn me me 0:07 04 😊😊vcc cjh😅 so 0:07 😊😊😊😅😅
Using my manifold set- I'm recharging through the low Port ONLY- the low Port coupling is obviously open. My question is-your highport coupling is open so this way you can READ the pressure on the manifold gauge... The High valve on the manifold gauge NEEDS to be closed...BUT the coupling on the high side is OPEN for reading on the manifold gauge?
Is that last part correct??
Close the high side when recharging.
The high side is only for vacuuming and diagnosing.
@@coyoteserranoband Yes, follow what he did in the video. Close the big red knob before connecting the refrigerant in fact, close both knobs ( blue and Red low|high ) before connecting the yellow service line to the refrigerant.
open the blue knob after you bleed the yellow line of air and open that knob only at the manifold and very slowly.
Just a quick FYI from a licensed residential HVAC technician, the top port on the vacuum pump is for a normal residential ac hose hook up, not out dated lmao! It’s appears the vacuum pump can do ur home ac or vehicle. A lil late but thought I’d help u guys out with that tidbit 😊
Yes indeed! R410A but it's actually the same exact connector as the old r12
I'm a truck driver and doing some work on my truck saves me a ton of money and with just this video you saved me around $2000.00 bucks. I thank you and God bless you.
NICE! Thanks for watching!
I'm 50 years old, have been working on cars for 35 of those years, and am quite arrogant. But I cannot believe how much I learned while watching this video!
Thanks so much for watching Adam!
Thank you very much for your video! Since my husband passed away, I have learned to do many car repairs thanks to kind people like you who share knowledge! I have replaced my vvt solenoids, my blower motor, the ac circuit board, changed the oil, and more. I am now hoping to get my ac running again because this 100 degree temperature in Houston is killer. Not to mention, only 1 of my windows rolls doen, my car is black, and I work as a window cleaner outside. I am sure my coworkers would be happy if I can get my ac working...lol! Thanks again!
I'm sorry for your loss. I'm very impressed you are a self taught badass! Thanks for watching!
@@2carpros thanks so much!
The most descriptive demo that I've seen on RUclips in this field. Your expertise is 'spot on'. A pleasure to learn from you. Thank you. LWJ Qld, Australia.
Wow, thanks! I try to do my very best, your words are very kind!
Probably the best video I’ve seen for AC work. Thanks
Glad you liked it!
@@2carpros going to get my AC vacuumed out does vacuuming your AC system pull the oil from the compressor
I’ve charged my a/c a couple times. And I refresh my mind when I do it. And this really is the best video I’ve come across. And I like how you re-iterate the Do’s and Don’ts.
One of the best instructional videos I've seen yet. Your demo and step by step explanations are perfect for the average person with little to no experience in performing this procedure. You have saved many who watch this, tons of $$$$. Great job! 👍🏼
Wow, thank you!
@@2carpros it's been few decades since I have performed this and your video was the perfect refresher course for me..thanks!
Absolutely has, I'm sure.
From gulf coast, SE Tx here as well.
Much needed and Many thanks.
Good job bud! This video really helped. Concise, to the point w/o bs fluff and really thorough. Thank you sir.
Excellent video - nobody else explains this process as clearly. Kudos! Now I have a working mini-fridge. Thank you!
Best explanation and hands on showing the proper way to evacuate and charge an AC system. Thank you 👍
To say the least, great video. I have been servicing my vehcile's A/C system for almost ten years, and this young man helped me learn something new. Thank you!
Glad it helped!
Absolutely the best video out there to do this. Not only tells you what to do, but what NOT to do. Explains in detail exactly what it is doing and how the system is working. Really good.
Thanks buddy got my ac working on my mini after a broke a line I couldn’t afford a new one so just used a ac coupler ,didn’t know it was going to work and hold pressure so it was nice to use vacuum pump and see before I wasted the ac juice ,time And money. It’s nice to have videos like yours to help fix things without trail and Error
One of the best RUclips videos I have seen...and I have seen A LOT! Nice job. Very helpful, straight forward and clear.
We say turn the bottle upside down because we "crack" the valve open where it is released as a GAS not liquid in the gauge set, and again once it enters the system. You can do it either way. Also leave the high side valve closed when vacuuming down, it wont vacuum faster with the valve open, it equalizes through the orifice or expansion valve, no problem.
Followed this guide and purchased the recommended kit on amazon, about two hours after it arrived I had my AC fixed and blowing colder and stronger than I can remember! Thank you for an excellent and helpful video!
Shut up
Did you refill from a keg?
@@LandenBMS I did not, my system used about 4 12oz cans of Super Tech 134a refrigerant I got at Walmart along with a can or two of AC refrigerant oil from the same source.
@@gmarkochon
Absolutely great vid man, I've been a back yard mechanic all my life and this was the most helpful ac video I've ever seen!
I’m not one to leave reviews but your instructional video was spot on!! You were clear with important information, didn’t drag out everything like a lot of videos I’ve watched! Thanks a bunch
God bless you for this. I have the entire dealership's maintenance and repair manual from GM for my 2003 Chevy Silverado Z71, and 95 percent of it pertains to other trucks. I spent days trying to understand something bigger than an NYC phonebook, and you explained more than it could in all of a few minutes!
Very very cool! Thank you for watching John!
Just bought the vacuum pump off your link, hope you get your cut!!
Loved your video, really really great video!!
Keep up the amazing work!!
May God bless your and your family
So far the best detailed a/c video I’ve seen. Definitely helped me solve my issue!!! Thanks so much.
Great to hear!
I have been watching 10s of videos on tackling my AC project. And this is concise and to the point with the added tidbits of knowledge I have been looking for
This saved my Bacon. I replaced a line that blew off. I'd installed my AC 6 years ago- my one and only experience w/AC- and had forgotten how to use the manifold gauges and vacuum pump. Great write up and greatly appreciated.
Nice work!
Terrific video. Gave me the confidence and skills needed to complete my AC Auto repair.
Nice! Thanks for watching!
Great video.
I used to work in a body shop few years back, and I've forgotten a bit how to recharge the ac.
This video was a good memory refresh.
Thanks!
Hello from Mexico
Dude - great video! I watched two others who had the same instructions - didn’t work. (they both say to open the High side too). Your instructions worked perfectly! Thanks!
I'm really glad you watched this video then. Thanks for watching!
Thanks for this video, I have looked at many but many videos there's always one point they miss, Cant see anything you have missed here. Very clear instruction .
This video is without a dought the best most informative and well made video concerning car A/C that I have ever seen ! Thank You !!!
You speak my language. very helpful, straight to the point, easy to understand, Subscribed!
Fantastic video. Just finishing up rebuilding my ac system and this was great step by step info for the charging.
Great to hear!
Hey bro, just wanted to say this was the best AC recharge video I've seen by far. Great job, keep up the good work, and thank you.
Thanks, will do!
THANK YOU!.
alot of the other videos I just couldn't understand. I'm 62 and 2 strokes under my belt so that makes it hard.
I watched your video and had absolutely no problems whatsoever. Your straight and to the point and you also put out there the dangers of doing this yourself, mostly you tell everyone what precautions to use to make it safe.
Thank you so very much my alero thanks you to. In Arizona ac is a have to.
Sincerely Larry.
Hey Larry!
Thank you so much for watching and nice job on the A/C work!
Best,
Ryan
Much better than your other video. Very informative, thanks.
Watched another highly viewed YT video on the same subject and couldn't get it to take a charge. Set me back about a week. The instruction to keep the high side valve closed was never mentioned in the other video. It made all the difference! That one detail and that it was written on the valve handle. My car took the R134 like a champ after I closed the valve. Many Thanks Sir!
Glad it helped! Thanks for watching!
I NEVER like videos or follow someone unless it's just the best information in the world for me. You sir, are the best. You explain soooo thoroughly each step that you answered all my questions. Most people skip the steps they think are obvious and common sense but then other people who are just following steps end up skipping important parts
Wow, thanks!
Shouldn’t you be measuring the weight of the tank for the proper amount of refrigerant to add?
This is one of the best descriptions of ac systems and service I've seen on RUclips. You are awesome, thank you.
Super video. It told me what I needed to know. Now I can fix my A/C.. my wife will be happy!! Thank you.
Great step-by-step video dude. You've explained the process better than many other videos here. I was a bit iffy about the vacuum and recharge process but your video has cautiously given me the confidence I needed. Subscribed. Thank you. Keep up the good work!
Awesome, thank you!
Thank you for that great video! Very helpful and was quite confused about the red Gage watch lot of videos no one ever mentioned it or even what pressure it should be. I just did two vehicles and both of them are perfect first time I ever attempted an AC job.
Very cool! Thanks for watching Dave!
@@2carpros Was that pun intended??
No but I'm happy it's there now. Thanks for watching!
One of the best videos on the subject I have ever watched. Very well done.
Thank you for sharing it, very detail info provided. Thanks again.
Great video! And love the "hypotheticals," everyone tells you the same basic standard liability lingo which leads to the same limbo. I understand it's bad for the environment and wouldn't do it anyway, but love the extra knowledge that comes with the hypothetical aspect. Thank you.
Thank you so much for watching and for understanding what I mean.
For everyone asking "Why is there a high side valve if we don't open it?!" It is there to vacuum it down the system a little quicker. The reason I said don't open it is the system is a loop and just vacuuming via the low side will accomplish the same goal a bit slower. BUT if you forget to close the high side when you turn the car on with the keg attached the system pressurizes with the valve open it back feeds into the refrigerant keg and explodes most likely injuring if not killing you. Good? Good.
ALSO You don't need to add any in this instance because nearly zero is lost. If you put too much oil in the system won't work at all and is very easy to do.
If pag oil was important in this instance I would have mentioned it.
-Ryan
Just seen this comment, make sense now
just had a coworker arguing that you have to use the High side while recharging. I told him to get bent.
7
B
Old-timer here.Decades of MX/Engineering in Aerospace. You're the REAL DEAL, Ryan. You're an excellent educator. You emphasize the danger points well. People DEFINITELY need to hear those safety points over and over. Thanks for another excellent video and keep up the great work, young man.
Thanks a ton for the video! First timer here - I was able to successfully vacuum and recharge my Truck thanks to this video. I was so happy that I started singing "Hallelujah" when the cold air started coming out of the vents.
The vacuum test gave me confidence that I had put the new condenser back together properly. Thanks again!
Great job!
Your video is BY FAR the VERY BEST I've seen on this subject, and, believe me, I watched many. You NEVER skipped a beat, NEVER lost your train of thought, NEVER failed in any instance! My sincere congratulations for a job well-done! By the way, I also like the pinned comment about WHY you keep the high side closed! That's the best reason anyone can give! ;) Semper Fidelis! CWO4 USMCR [Ret] 17 February 1969 - 1 August 2004
Wow, thank you for watching and thank you for your service to our great nation! :)
@@2carpros Unfortunately, even though your video is great, things did NOT go according to your video. :( I have a 2002 gmc sierra 1500hd w/6 liter. i was in the process of replacing my compressor which was bad. I installed a new compressor, new condenser, new accumulator drier, replaced the low and high pressure switches on the accumulator and the back of the compressor. I followed your video to the letter, including NOT opening the high-side manifold gauge. I ran vacuum tests for 30 minutes, waited 10 minutes, and perfect -- no leaks! So I proceeded to load freon, and the same thing happened the last two days: within 30 seconds after beginning to add freon, the high pressure switch on the back of the compressor blew out! I assumed it happened yesterday because I had not properly installed the split ring to hold the high-pressure switch in place, so I carefully checked to ensure the split ring was installed properly. Today, the same thing happened again -- within 30 seconds there was a loud hissing, then a 'pop', and the high pressure switch had blown out again. Can you tell me why this happened, and what I can do to correct this and ensure it does not happen again? Semper Fidelis! CWO4 USMCR [Ret] 17 February 1969 - 1 August 2004
@@GunnersRange Did you get it to work?
Best video I’ve seen! The short explanations of why something is happening helps to understand the whole process without overwhelming us with information. Thanks for the help!
Awesome, thank you!
I believe you may have forgot to mention the maximum vacuum will decrease by 1 inch of mercury per 1000 feet of elevation. At 5000 foot elevation the maximum vacuum will be 24 inches hg. (29-5=24) Thanks for a good video.
Why will this be important, to me that's very confusing doesn't mean anything or it's just knowledge
@@analazcano6475 Because when you pull vacuum and your at say 5000 feet you won't see the gauge go to 30in.
THIS! I have been searching for this info- my beat-up auto zone loner vacuum had me thinking something was wrong because I could only pull 21 inches hg. But I’m at 6300 ft elevation.
Great video, very informative and easy to understand. The only problem I've had lately are using a gauge system like this with the pesky self-sealing cans!
I just replaced my leaking condenser MYSELF! Thank YOU Ryan
Nice work!
You should have mentioned how the gauges don't go through the valves. Found that on another video. Had to vacuum it twice. Fella's the gauge still reads with the valve closed.
That should have been self explanatory when he said to close the valve after pulling vacuum and wait and watch the gauge to see if there is a leak. If the gauge went through the valve there would be no way to know there was a leak in the system after closing the valve.
When you are pulling a vacuum on the system why not open the Hi Side (red) of the manifold as well?
I agree as the gauge set I have works this way but I imagine on their part it has more to do with safety. Most out there dealing with HVAC systems don't have a clue. Best 99% of people don't mess with the high side valve.
I also agree. I would open the high side as well when evacuating the system. Other videos do that so this. But when filling would have high side closed.
Hey there, when pulling a vacuum on a system, it means to remove air or moisture out of the system. As you can imagine, air and moisture exist in a "vapor" state. The Low side of the system is vapor only, while the high side of the system is liquid only. Therefore, you don't have a need to open the high side if you're not working with the high side. Hope this helped!
@@CipherVillain Well that would be true if you have a working system but if it has lost it's liquid or integrity pulling vacuum on both sides make the most sense. Correct me if I'm incorrect here.
@@curiosity2314 you're absolutely right, it is good to pull if for both! I was just referring to having both sides of the gauge ports open while pulling on suction. You can use the high side to monitor refrigerant while pulling low side just not both at the same time. My bad if all I did was just confused people😅 I just noticed Shamway had it right--
Great detailed information on safety, how to, and tips on getting the best outcome! Best on video on here!
I appreciate that!
Thanks for the great walk through and details!!
After you evacuate the system don't you need to add PAG oil for the compressor?
i see another guys video say that vaccuming out system like he does not lose oil only when u flush it
but i was wondering for sure the same thing
i see another guys video say that vaccuming out system like he does not lose oil only when u flush it
but i was wondering for sure the same thing
@@zacinnc78 - this is correct. This isn’t like a carpet vacuum; an A/C vacuum generally just removes the air and minor impurities like moisture particulate.
So at 11:51 you shut off the valves on the manifold. That means that you cut off flow from the vacuum pump to the red and blue lines going to the car AC. The blue gauge is also cut off from your car AC.
So how does that prove that your car AC lines and fittings are not leaking ?
All what you have done is to show that the valves at you manifold and the yellow line to the vacuum pump is not leaking but you have not shown that your car AC lines and fittings are not leaking !
The gauge is between the manifold valve and the vehicle. Closing it represents the pressure on the system, not the hoses.
i have been watching videos for about a week now and this is the best video by far, absolutely amazing explanations
Great to hear!
Thanks. You're very likable. Easy explanation and good visuals for those "monkey see, monkey do" like myself. Saved me a TON of money I did not have.
Hahahaha😂 Went on got your ac system depressurized at the shop a..... haha😂 You're funny. Thank you so much. You've got a cool way about teaching. Easy to learn.
Great video. Good information. But I have to say, its enormously frustrating to watch 10 different videos on the same subject, and each one contradicts the other on some aspects. For example, some respectable videos will tell you DON'T turn the refrigerant upside down to force it out as a liquid because it can shock your AC and damage your compressor, which is designed to compress gas. Others will says alternate rotating the canister up and down so that you putting in refrigerant in both liquid and gas form, but not so much that it will hurt the system. Still others, like this guy, are telling people just to dump it all in as a liquid to speed up the fill, with no regard to any potential damage, just to save time. Hard to know what to do when newbies get such wildly conflicting information about the "right" way to do something like this.
This is the way I was taught and the way I have been doing it for over ten years. Take that how you will. Thanks for watching!
SAME. I am so confused
Notice the guys saying not turn upside down are DIYers. The pros know that the whole point of a compressor is to turn liquid into a gas. It ALWAYS has liquid coming in to because it is in the loop after the condenser which converts the gas to liquid in order to get the cooling effect. So of course the compressor can handle liquid. Google image search for car AC diagram to verify this is true.
"had the shop evacuate it"
Notices suspicious residue on intake manifold lol
Do you think they did it wrong and charged me the 20 bucks anyways?! That would be a twist. Thanks for watching!
@@2carpros 😆 pro moves
$20? Cheapest I founded was $50.
I'm an HVAC-R student. This is a really good video; I'm about to do this on my car. Thank you!
Great video! Thanks very much for explaining so well!
That anciant R-12 is a hell of a lot better than R-134A ever was..Nothing will ever match it in fact..
True! Thanks for watching!
Wow. Every one of these videos I watch I just get more and more confused. I've watched like 4 in a row and they all said different things about when to open and close the various controls.
All I know is mine is right. Thanks for watching!
@2carpros isn't wrong about they process, but it's not the only way. If you follow the steps in this video, you will be ok.
But, he is completely wrong about his aerosol logic. Hairspray and A/C do not get cold for the same reasons... at all. Hairspray (and most other aerosols) feel cold on the skin from the process of Evaporation on your skin, after the atomized mist falls out of suspension... Not the pressure change from leaving the can. It's actually the can that loses heat in that process.
Remember... Water from a hose feels cold when it's misted over you & it's not high pressure. It's the extremely small size of the droplets, they can't hold heat.
Recap: liquid atomized into a fine mist - rapidly loses heat.
That Mist falls out of suspension (lands on you) & turns to a thin layer of liquid on the skin
- the evaporation process begins.
Additionally, the air going across that thin layer of moisture also removes heat
- The cold feeling on your skin.
This is why we sweat, not how our ac system works.
@@NemonicsRacing this is 9 months old and I'm not even really watching his thing but... While you're absolutely correct about the evaporation of the things leaving an aerosol can, landing on your skin and then evaporating....
A can contains pressurized gas. Sometimes it's even pressurized enough to be liquid within the can.
When you expel those out to the atmospheric temperatures that can itself gets cold, for the same phase change reason as your air conditioning system.
The best aerosol can example of this is actually the AC cans themselves when you go to recharge the system. The reason they get cold as you're feeding it into the low side of the AC system is that they're going from highly pressurized into a liquid, and phase changing to a gas.
So while nothing you said is wrong. Nothing he said is wrong either.
You just misunderstood what he said.
This helped me a ton! Somehow I got my Subaru XT6 converted from R12 and this guide was great all the way through
It’s about 2 years ago but I personally so appreciated its really clear and best explanation on RUclips earth! I’m not a mechanic but this lesson is a gold since I will do a bit on my car this weekend ! Thank you
Some systems won't leak while under a vacuum test however, once the system is charged and the compressor is making a LOT of pressure it 'may' leak.
Old school is to leave the system under vacuum over night and check for vacuum loss the next day.
Good morning family and thank you very much for the valuable information and for your time. 👍🏼👍🏼
Great video, just what I needed! Thanks!!
Great video! I’ve never attempted to do this myself before. Compressor went out on my truck. Got it changed out and used your video and OReilly loan a tool program to vacuum and recharge my system! Thank you! Subscribed!!
Nice work! Thanks for watching!
very well explained. Excellent tutorial. I’ve been looking into this type of repair for my small business. I have the vac pump and gauge manifold i purchased awhile ago and anxious to get it going. Thanks again for such a great vid.
Absolutely brilliant explanation and visual procedures regarding the AC system... A big thumbs up from the UK 🇬🇧
Glad you enjoyed it!
Appreciate the video man, went to Harbor freight and picked up everything I needed to get this done. Never leaving my truck for hours at a shop to get this done again!
Nice work! Thanks for watching!
Thank you bro for uploading this precious instructional video on you tube.😊😊😊❤
Perfection. Worked EXACTLY as you described, step by step. Thank you!
Excellent!
Excellent demonstration
Great vid. I just ordered service kit from your link.
Thanks!
Stoked 🤘 I’m doing vehicle cab removals in future for motor/trans swaps and not wanting to disconnect pump from motor all ways
Best video on AC gauges and system thanks for making this video very helpful and educational 👍🏽👍🏽
Thanks for watching!
I know this is an old video but I give thanks to you for spelling out easy peasy how to perform this service. I’m diy and this really helped to get me going. I’ve got a 2013 f150 that I pulled out the dash and replaced the evaporator, heater core, expansion valve, drier and a damaged low side line(I did that). Tried to vacuum and charge and then had to have it diagnosed and had to do the compressor. What a mess. Thanks to your video it made things way easier than the others out there. Thanks again
Happy to help! Thanks for watching!
This is an amazing video. Been looking for a long time for a decent instruction video and you nailed it on the head. Great work my friend.
Awesome, thank you!
very much appreciate this video and all of its contents, thank you! DIYers gotta DIY
Thank you so very much for this.
Exelent explanation. Thumbs up.
Thanks for such a good video, on explaining the whole process.
You're very welcome!
Great job explaining! Appreciate It.
GREAT TIPS SIR, WONDERFULY EXPLAINED
Thank you for this great video!
Beautiful! Excellent/clear instruction and guide to necessary equipment. I have this job approaching me in the very near future.
Great! Thanks for watching!
Great video, thanks a lot!
9:40 interesting how there’s a mystery substance all over the engine on the top right side right after you took it to the ac shop to have it evacuated properly 😂😂😂😂
Great Video, Thanks for keeping it simple and to the point. My rebuild AC is now charged, and if it ever stops snowing here in Idaho😂😂, I'll be able to use the AC. 😂
This was VERY helpful!!!
Excellent video with instructions. Thank you for sharing this information.
You are very welcome!
Most informative walkthrough. Thanks!
Glad you enjoyed it!
Best tutorial I can find on RUclips
Very nice video thank you for taking the time to make it.
Best AC service guide on here.
Great explanation, great video, I recommended.