How to use AC Gauges in Your Car (AC Problems)
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- เผยแพร่เมื่อ 13 ก.ค. 2011
- AC gauges. How to use AC gauges in your car DIY with Scotty Kilmer. How to fix ac problems. How to read and recharge the AC system using pressure gauges. How to use a set of AC gauges to fix air conditioning that's not working. DIY car repair with Scotty Kilmer, an auto mechanic for the last 43 years.
⬇️Things used in this video:
1. AC Gauges: amzn.to/2BIru4v
2. Big Fan: amzn.to/2kDJTIP
3. Flashlight: amzn.to/2kwtiu3
4. Common Sense
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⬇️Things used in this video:
1. AC Gauges: amzn.to/2BIru4v
2. Big Fan: amzn.to/2kDJTIP
3. Flashlight: amzn.to/2kwtiu3
4. Common Sense
5. Full HD Camera: amzn.to/2AvoEk7
6. My computer for editing / uploading: amzn.to/2i2sKYz
7. Video editing software: amzn.to/2jv5Fhf
8. Thumbnail software: amzn.to/2k7tz6C
🛠Check out my Garage to see what I use every day and highly recommend:
www.amazon.com/shop/scottykilmer
❗️Check out the Scotty store:
goo.gl/RwhRGU
👉Follow me on Instagram for the latest news, funnies, and exclusive info / pics:
goo.gl/ohy2cA
Scotty Kilmer this comment is hilarious.
Dang.. the link for the sale on common sense is absent. Back to dragging my knuckles then..
Dear Sir, my car (Lancer) shows very high pressure on the high-pressure side such that the HVAC pressure switch turns off after 40 sec when ac is turned on...what might be the reason for this. Recently my car runs through water upto a level of 1.5 foot. Whether water gets enter into the system
I need common sense Scotty 😓
where do I buy common sense at?
Keep in mind I am from Texas, and we talk a bit different down here. I was watching this video, and thinking about how much I like your videos. My son comes up and says "he's talkin' funny." :-) I said Son, when a man knows this much about cars, and helps out this much, he can talk however he likes. Scotty, I want to say THANK YOU!!! Your videos have helped me out countless times and saved me a ton of money. I appreciate what you do, how you do it, and even how you talk!
Paul Irwin lol Scotty's also from Texas how funny!
Hell yes
The guy is from houston.
@@florascent9ts scotty from new York he is
@@flicmydik pretty sure niagara falls usa
the low-side negative pressure info was the gold nugget for me...
... only video yet i've seen that's mentioned it.
Kilmer is a gift that keeps giving.
11 yo video and yet in 5minutes it explained the usage of the tool and common issues + fixes better than most others do in videos four times as long. Thank you Scotty for your work!
best most informative quick and no BS video i have seen on pressures and diagnosis today, and i've watched 30 vids....
Agree , straight to the point. 🖐🇦🇺
That comes from years of exprience and not by school boys
Scotty, I recently found your videos, and I love them. I like your energy, and no nonsense way of explaining stuff. Keep up the good work, and thanks for the help.
Scotty, thank you for sharing your knowledge. There is nothing like doing a job the "Right Way." I watch your videos often. I'm 73 and still learning about cars, love it.
You are very verbal and explain things easily and clearly in a step by step fashion without getting distracted...and it’s clear you like what you do, so that comes through in your TH-cam videos. So many guys on TH-cam who discuss mechanical issues with cars, lawnmowers, go carts, etc. can’t even talk to the public well, so it’s hard to follow them. And there are gaps in their discussions...probably gaps in their knowledge too. Thank you for your videos.
make sure the condenser fan comes on first. If it does, you have a serious high side restriction like drier or bad expansion valve
Thank you Scotty this helps a lot. You explained everything like no other…
Scotty you are my hero! I've been subscribed for several years and your channel almost always has the answer(s) I am looking for and them some more. Quick facts and videos are set-up an an effective manner to learn from.
I and 1.3 million others greatly appreciate you!!
Hi Scotty, Changed my Shrader valves, evacuated and recharged my Lexus SC400 today. Thanks for all your training. She is pushing 42 Degrees now through the vents. I used the O'Rielly tool program. Total cost for this project was 70.00. Doing it with your help saved me tons. Thank you, Rick
Love ya scotty you are so awesome for helping complete strangers. They broke the mold when god made ya. Thanks for all these great posts.
I thought your description of various pressure scenarios was bang up!
Thanks.
I've fixed a bunch of ACs in my career and that is about the best, succinct and accurate tutorial I've seen. It's not complicated, you just have to understand what each of the components does and it starts making sense. Good job!
Can you help me out with mine?. I just replaced my compressor, condenser and expansion valve. A/c wasn't cool especially during the day. It's was "fresh" in the morning and night.
Well like I said, I replaced those 3 parts and still doing the same thing. The mechanic told me I probably got a defective compressor, so I bought another one and still the same.
Scotty, your channel is the first one I check to see how to check and repair my car. Thanks a lot for sharing your expertise and common sense!
generally it's worn valve seals or piston rings doing that. Do a wet and dry compression test to see if its the rings, and pray the pressures are good, showing its valve seals, which you can just live with
This video was totally helpful. Low and high was the same took off the compressor it was drier than a popcorn fart. Thanks Scotty
That seems pretty dry....
I'm stealing the term "popcorn Fart"
So many videos on youtube on the subject ,some very long ones,yet you managed to explain exactly all the scenarios in a very short video and not too many words but all done in a way that anyone can understand.I take my hat off to you sir !I had bought a set of gauges and the low pressure was 70 and high pressure 100 psi with engine off ,with it on and the compressor spinning it doesnt do anything ,so it must be a bad compressor.
Scotty this is by far the best explanation I have seen to explain what the low/high a/c readings mean and what the fix would be. Your help is much appreciated.
If you like my car help, be sure to watch my live car talk show every Saturday morning at 10 AM CST on TH-cam. I answer your car questions LIVE there. Just check it out at How To Ask A Live Mechanic Car Questions Free On TH-cam . And remember, every TUESDAY I upload a new video, so don’t miss them.
Great video Scotty! This is what people want to know. A+
This guy is great! I love his enthusiasm.
its from sniffing leaking refrigerant all those years
Thanks for the info. I went ahead and bought a set because I went to an A/C shop and they told me the compressor was shot so they quoted me a pretty steep price plus parts, refrigerant and recovery fee. (~850) I checked the system and found it was about 20 psi on the low side and less than 100 on the high side. The system is now cooling but I will see how long it will last. One item the HF set was missing was the valve to pierce the can which cost 6.99 at AutoZone. Your videos helped me take this project on. At the end, I had ~45 on the low side and ~195 on the high side. worked perfectly. Thanks again,
I've watched a lot of your videos so far Scotty. Thanks for posting them. I like your style of explaining things, straight and to the point.
Just awesome thanks for this video! Very well done.
Thanks Scotty. Unlike most people in the world you are quite useful.
I'm prepping to replace the compressor and condenser on my wife's Subaru. The condenser has some refrigerant dye on it and I know that's where the leak is. The compressor has just recently starting making a whine when its running, but still works ... kind of. The AC is cool, but not cold.
Since I'll be in there doing major surgery I also decided to replace the $20 expansion valve and am putting in all new o-rings and replacing the Schrader valves as well. I have a set of gauges and use them regularly but thought I'd refresh my memory about them. Your video is as always... spot on.
Just replaced everything but the AC in my 2007 Dodge Cummins. Charged it-- at 60 degrees outside temp. 30 oz of 'freon' went in, but the high side only read 50-- when I took the guage system down, the red hose was clogged with oil under pressure. I put 2oz of oil in the accumulator; 3 in the compressor and 1oz in the condensor.
Anyway, it seemed like a clusterf--- doing it, but I have cold air in the truck now. We'll see if it lasts! Happy I saved myself $1,000.
Thanks for all you do.
This is a great video, Scotty ! I'm just a hobbyist, so it took me years to learn all of that on my own (pre-internet too). Somehow, you compressed all of that knowledge into a 5 minute video. Thanks !
Thank you so much Scotty. I’ve learned so much and was reminded of lots of things I’ve forgotten. You are appreciated. Where might I find a full chart for ambient temp, Humidity, with low and high readings?
@@roberthuggins2086 It is not in Haynes, but I saw the chart in Shop Manual I fortunately have for 2 of our cars.
you can't check the compressor pressure unless it's moving. Try hot wiring it to make it spin. If it won't spin or does and the pressure is still that same, it's shot
This is the first video of yours that I've viewed. Scotty, I gotta say, I love the way you deliver information. I've been independently studying AC systems for about three months now for work. I'm green in the automotive field (a year into it), and no one else has really been able to plainly state what the gauges indicate. At work, the recommendation is always evac and recharge. No real diagnoses to speak of. I just had that aha! moment. Thanks, Scotty. Subscribed.
If you like my car help, be sure to watch my live car talk show every Saturday morning at 10 AM CST on TH-cam. I answer your car questions LIVE there. Just check it out at How To Ask A Live Mechanic Car Questions Free On TH-cam . And remember, every TUESDAY I upload a new video on the scotty kilmer channel on TH-cam, th-cam.com/users/scottykilmer , so don’t miss them.
Thanks, Scotty. This clip confirms the issue I have with my rear A/C not working.
thanks scotty, my auto ac shop wanted $900 to replace my compressor, I can do it now for half that with new pump & expansion valve, oil and refrigerant including buying the vacuum gauges and the vacuum pump!
@wangbungal Yes, I've broken knobs off on all my gauge sets, I end up replacing them with metal knobs from a hardware store for outdoor faucets. Scotty
Clear. Concise. Not over-complicated. Very well done sir!
Scotty this video on AC guard usage was amazing. Ty so much for sharing your truly top notch professional know how on auto servicing....your truly a blessing for this world. Love ya buddy
low side is a bit high, but if the low side line is cold, and the high side hot, often it's a dash problem is you don't get cold air cause those pressures aren't that bad. Often the dash unit blend doors don't open right to let cold air into the dash when you have those pressures which aren't off by much
generally a restriction in the system does that, but low refrigerant level can do that too. Make sure the right weight is in the system.
Great video. I had the same problem with my car. Through this AC gauges my air conditioner regain new life.
Probably your best one that I’ve watched Scotty. Thanks
when you check the pressures, you don't open any valves at all on the gauges, you just open the valves on the system itself where they snap onto the car so the gauges get readings.
But what about the air that is in the hose? And if you checked and it is ok. Is there refridgerant in the hoses?
@@markmcselec when checking the pressures, the air in the hose has nowhere to go. It’s compressed towards the gauges to get the readings and then you close them before turning the vehicle off. The end result is that you have the air that was originally in the hose plus whatever refrigerant that flowed in while taking the readings. A negligible amount. So no air from the hose really gets into the system and not much refrigerant really escapes the system.
@@davidjeffers6339 thanks for the clear explanation. It now understand it.
Thank you Scotty for this information.
If you like my car help, be sure to watch my live car talk show every Saturday morning at 10 AM CST on TH-cam. I answer your car questions LIVE there. Just check it out at How To Ask A Live Mechanic Car Questions Free On TH-cam . And remember, every TUESDAY I upload a new video, so don’t miss them.
Hell yes , Scotty’s tha man 👍🏻👍🏻👍🏻
Scotty I’m a qualified motor mechanic in Australia and I learn so much from you! Thnx Mate!
I was a mechanic for 8 years and had no idea how to use the gauges as we just used the big machine. Just recharged my 90 Chevy with your help thanks
those pressures are not that bad, often internal dash problems like bad blend doors cause that.
The only guy that actually explains what different readings might mean.
Your THE MAN! I have a 4runner with the same engine, ac system and that's the direction I'm heading with my diagnosis
Hey Scotty this video was the second that came up in search results when I searched for this topic. The first was from AutoZone but I decided to go to the first “real person” video instead, and that was yours. So this is the first video of yours I’ve seen, and I gotta say I really found it useful and informational, and also I really dig your presentation style. Subscribed!
where can I find the chart for the correct AC pressure that Depends on the temperature and the humidity
??
As I'm watching, my son says to me "Why is he yelling?" Lol
Thank you so much, Scotty! You’ve been a great instructor over the years
Why do you always do a better job explaining things in a very simple way? Good job $cotty.
by law you are supposed to use a recycling machine to suck any old refrigerant out of the system. But if the system is empty, you can use a vacuum pump to suck the air out before refilling it.
my low side is about 40 but it decrease to less then 20 when I accelarate , any Ideas ??
THANK YOU
What is the high side read? Probably low on gas, need top up.
Thanks for this vid! This is some of the best instructional I've seen on youtube. My 1999 Miata mx5 is making a shrieking noise and pulling what seems to be an abnormal amount of power from the engine in addition to coming off and on with the cool air. I have a Harbor Freight very close so will try this!
great video Scottie, finally a mechanic who explains how to diagnose an A/C system, all these other youtube “mechanics” only seem to be able to diagnose a locked up compressor/clutch not engaging, or a system that has no freon in it.
Scotty I love your videos for an experienced technician, I almost always learn something. I really love ya brother in arms for all you do for us. ******* But for the inexperienced backyard or new mechanic I find your videos DANGEROUS for them and the rest of us on the road. ******** You often leave out EXTREMLY IMPORTANT SAFETY INFORMATION. ************* In this case you failed to mention the use of the knobs on the gauges and when to open or not to open them. Opening the High side while a can is hooked up could be very dangerous. Also you gave no warning about possible frost bite, or can manipulation or position when filling. Brother you've got to fix these SAFETY ISSUES in your videos. Or at least say you should get an experienced technician to teach you. Love ya bro Best Wishes n Blessings Keith
This video is not about charging an AC system. It's about trouble shooting and taking readings. But I see your point and it's good practice to add the do's and don'ts.
Scotty is just educating the public so as we know the problems. It is not an issue in your country where all is professional and honest. In mine, we need to know...period or else.
experience is good for a mechanic/technician, but in the USA you also must be "Certified" to work on A/C systems.
Nadien Sans to work as a professional yes. One needs no certification to work on ones own vehicle.
@john boy EXACTLY you would like my videos. L☺L.
Dude, you’ve come a long way. I dig it that you’ve gotten better and funnier, people remember more accurately when it’s fun. Trust me on that one.
Energetic and very informative on all your videos. Great job Scotty!
Scotty, I appreciate the heck out of you on this video. Thank you.
first, fix the evap drain if it's getting water inside the vehicle. But if it's only wet outside under the hood, they often do that when really humid outside
Scotty very well done - explained simply and throughly with various readings for L & H --- great job ...
Wow. You just explained and simplified what i thought was a myth . Diagnosing a car AC!
👏👏 thank you!
This guy is amazing and YES he built a personality of course he's funny,but what matters here is THE PASSION that this guy has to teach what he knows!,not everyone does that,thanks SCOTTY and may God bless you and yours always!!!
depends where the valve is, some like many chryslers are on the firewall, take half an hour. some are inside the dash like mercedes, take a day. Look it up on any data system for labor hours
I do appreciate your video and response. I couldn't bare the $850 for compressor so I did some more looking. My 2006 Ford Freestyle along with some other older Fords and Chevys use a scroll type compressor. A common problem with them is a $35 scroll valve located on back of compressor. 30 min fix. Symptom was " warm at idol and cold while driving. Thanks again for the video and input what got interested in doing it myself and not spending the money on the whole compressor.
Thanks for your invaluable info! My mazda CX-7 has me stumped. But I'm going to break down and buy those gauges and properly ✔ levels.
I learned a lot from your video. I watched it several times. I am having AC problem on my 1998 Chevy Cheyenne.
Dude you rock Scotty! You have such a great entertaining and informative video. Most are just boring and fluffed with information. You actually kept me watching where many just talk nothing and I close the video out. Thank you!
This guy has randomly helped me so many times.
try hot wiring the compressor with a wire from the battery positive terminal to see if it works then. If it at least turns, then check your low pressure when turning and if it's low, you a re just low on refrigerant
You're awesome and informative, Scotty. Thank you for passing along your knowledge. You've helped me in many situations, WAY above my pay grade!
Thanks Scott! It worked on my car's AC system.
internal restrictions in the system are doing that, anything clogging the inside such as expansion valve can do that
it will shut off at 20 from too low pressure. often a restriction from a bad expansion valve does that, but low refrigerant can do that too.
Scotty, you are truly the man! I respect your honesty and info
Thanks scotty you make my schoolwork easier to understand. Wish you were one of my teachers 👏🏽👏🏽👏🏽
Thanks Scotty as always there with the answers when I need them.
First time watcher. This video is excellent, thank you for all your help!!
Thank you for clearly explaining the use. Great job.
well, I've had mine a couple years and use it every day in the summer. No problems yet.
For just five minutes time, that was a very informative video Scotty. Nice job.
Finally a video that explains everything! Thank you sir! You are amazing!
often a bad magnetic clutch relay does that on that car. try that first. Good readings would be around 30 psi on low side and 200 or so on the high side though.
Great job explaining the different of issues you may come across! Awesome video....👍👍
Thanks Scottie- THIS DUDE IS AWESOME!-Extremely helpful
2:15 mark, awesome explanation, was informed I’d have to replace evaporator core or expansion valve. Either way they said it’d involve removal of the dashboard, which should bring cost to over $700.00. Great video, thank you.
they all have relays, but rarely do they go out on hondas. Try hot wiring the clutch and if it works, you might just put a switch on to run it, as hondas are all computer run AC systems and get expensive to fix often
vacuum leaks often do that, or sensor problems if a modern electronic computer controlled ac system
Hey Scotty,thanks for all the info.it helps us alot.keep posting
Great vid. I will change my expansion valve right now!
Fantastic informational video Scotty, thankyou for sharing it's appreciated. Cheers from 🇦🇺 👌🏻👍🏻👏🏻👏🏻👏🏻
Watching 11 years later, and I can confirm the gauges are now $64.99 at my local harbor freight compared to the $49.99 mentioned. Still a good steal haha
Thank you! My 2004 tacoma has "0" on the low side and "100" on the high side. The AC is trying to cool but doesn't get there. My fear was that it was the evaporator core as that is the biggest pain in the rear to fix as it is normally behind the dash. Your video confirmed this. I may just forget about fixing my ac and sweat the summers out. :)
Brilliant - Thank you Scotty.
Very useful.
the middle hose is the hose for adding the refrigerant, it goes to the refrigerant adding cannister
Thank you Scotty, I've always wanted to know this!!!
Still the best AC diagnosing vid out there
try the expansion valve, pray it's just that. if not, either a restriction somewhere or a shot compressor
Thank you Scotty your videos help me out so much