R134A AC System Pressure - How to Spot the Issues!

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Download the free Pressure Chart poster here: bit.ly/2UZkdGx
Download the free guide here: bit.ly/2VNCGe1
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Skip Intro 0:22
Tools Needed 1:08
UNDER THE HOOD
1) Connect the Gages 1:30
2) Vacuum the Hoses 1:45
3) Set the Right Refrigerant Level Charge 1:53
4) Determine if the Readings are Correct 2:10 (bit.ly/2UZkdGx)
5) Measure Operational Pressure 2:30
6) Determine Possible Failures 2:56
7) Examples of Issue - LP & HP are Too High 3:34
Learn how to spot the issues in any AC climate system using r134A, just by reading the pressures of the system.
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I also have a series of videos on turbochargers. Check them out here: • Turbochargers - Troubl...
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If you want to access Nissens online trainings for free, you can do that here: ntc.nissens.co...
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I hope you enjoyed my video on temperature diagnostics in the AC System. Please don't forget to like and subscribe.
Thanks for watching and see you next time!

Опубликовано:

28 сен 2024

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Комментарии : 140

@islandborn1457 Год назад

There’s no way this guy isn’t one of the top tech tubers Great video bro

@romcon7097 3 года назад

oh my goodness. the best video I have watched about car AC. gotta love the acoustic/electric music background too. thanks mate.

@RobinundertheHood 2 года назад

Glad you enjoyed it!

@therealspindoctor2593 2 года назад

Wow, incredible production quality!

@Exist64 3 года назад

The production quality is so overwhelmingly good, it's hard to focus on what he's actually trying to teach us.

@dorianjudah5429 3 года назад

Instablaster

@RR31982 Год назад

It is very good 👍

@fernandoherrera6410 Год назад

Hi Robin, how about when your low pressure is functioning fine but your high pressure stays with the ambient temperature when your compressor engages ?

@andrewj7424 3 года назад

I'm charging an ac in a hyundai accent using r134a. I changed the expansion valve and still have pressures that are way off. 50 on the low side and 50 on the high side. It is also no longer taking freon even though the ac pump running continuously. Its about 60 degrees outside. What should I look at next?

@TIMEtoRIDE900 3 года назад

Maybe look at a Toyota ??

@hostileaks4495 3 года назад

Compressor

@tomeejr Год назад

Good vids. I tried to find that poster on the Nissens website, but was unable to. Think it's still listed there somewhere ? Thanks.

@MM2009 3 месяца назад

what to do with overcharged system? tried to drop the pressure but with gas its spitting oil

@faizmirza4478 2 года назад

Why the a c temp. Is not maintained,suction pressure is 40psi and discharge pressure is 130psi, amps is 16, gas is R134A. What is the problem ,can u suggest ????

@fdpo11 2 года назад

Thanks for the video. My high side is low, but my low side is *normal*. Any suggestions? (85 degrees F, 60% humidity, high is 160 psi, low is 47 psi, 2011 Altima)

@whit2423 4 месяца назад

Same issue, did you ever find out the reason?

@Michael-hg2sq Месяц назад

Thanks, great information!

@mihailpopov1246 14 дней назад

Thank you!

@ranchhandrandy3213 3 года назад

Thanks for the talk. New subscriber.

@bryandiaz3108 2 года назад

I don’t know if I miss it on the video, what what’s your ambient temperature while doing this test?

@kellismith4329 Год назад

You look that up on the chart when you know what the surrounding temp is, that’s why he gave a range of 10psig-50psig

@winkawak 2 года назад

I have a yellow jacket manifold with knob on the side. So its clockwise to close and counter clockwise to open.For some reason when i open the low pressure side, refrigerant are not being added. Any ideas?

@kellismith4329 Год назад

You need to open the middle valve with your refrigerat supply and then feather in through the side valves

@hugoayala6472 4 года назад

Any help

@righteous1229 3 года назад

Awesome video

@gomezaddams9221 4 года назад

so if my low side is high and high side is low, chances are there's trash plugging the line somewhere?

@saponiblood 3 года назад

Low refrigerant

@mitchellbonomi9309 3 года назад

I need help, please. My car get warm air temps during stops or idle, Pressure are good, fan running properly and replaced, Compressor, H block, Condenser/recieved dryer, and Evaporator, I am so stumped replaced all those items to try to fix the warmer vent temps at a stop or idle and still have the same problem, what could I be doing wrong, I always have the shop evac and recharge professionally, no leaks, no dye in the system. But is does take over 1 hour to equalize pressures at 90* Arizona ambient temp. Please advise if you can, thank you.

@abhishekbhatnagar5231 3 года назад

Your problem is most likely a malfunctioning condenser fan. This would explain why the AC doesn't work well while the car's stationary- there's simply not enough air blowing over the condenser to let it do its job. When your car is moving, enough air blows over the condenser (even with the fan not working) and your AC blows cold. Another far less likely problem may be the blend door malfunctioning. Your AC may be doing its work, but the cold air may be getting mixed with the hot air. Looks like you've eliminated any other likely causes.

@CommonSenseTipsAndTricks 2 года назад

Good information but does not help out so many of us who need to decrease the pressure so we can have the ac working properly. It seems everyone explains the system well but nobody yet has given a solution to an overcharged situation. Why do so many tip toe about that?

@imlikerhettbutler5093 2 года назад

EPA regulations

@MooMooCow357 2 года назад

140-350. Good thing that is a small range

@FelixLantiguaCamacho 4 года назад

Holly!!!!!!!!!!!!! Damn! great video!

@RobinundertheHood 4 года назад

Thank you. Much appriciated!

@journeysautomotivetruckrep551 4 года назад

👍

@RobinundertheHood 4 года назад

👍😁

@jatinduggal584 Год назад

👍👍👍👍👍

@marcelh2341 4 года назад

Where can I found the shown static pressure table?

@RobinundertheHood 4 года назад

It should be in the description?

@marcelh2341 4 года назад

Nope, checked every link..

@RobinundertheHood 4 года назад

@@marcelh2341 the poster link is under step 4 in the description.

@marcelh2341 4 года назад

Ah you misunderstood me. I'm talking about the table which you show us at timestamp 2:28

@RobinundertheHood 4 года назад

@@marcelh2341 arh that one. I will uploade that for you guys. Will let you know when it is up. Otherwize, you can find it at Nissens.com/climate

@gregorypace2641 3 года назад

Nothing but a commercial (thats why the quality is so good LOL), don't waste your time

@hernanzapata1145 29 дней назад

Stop using AI to do videos, it just tells you barely basic comments

@53notneb 23 дня назад

Just replaced the compressor & expansion valve on my f150. Put 3 oz of oil & 24 oz of freon per the tag under the hood. The high side goes to 300, the fan comes on the pressure drops fast to 200 then starts climbing back to 300 cycles over and over.. The ambient temperature 78 the vent temperature is 39. Would my dryer in the condenser be bad or the condenser messed up? What say you?

@jafinch78 4 года назад

Thanks for the free guide and chart poster. Great detail!

@itsme-qi7jq 3 года назад

You never mentioned superheat or subcooling in relation to the pressure chart to diagnose correct system requirements....

@ilyaskassim9822 3 месяца назад

my cars is chevrolet tahoe 2015 low pressure too high and air coming hot not cold any one can me thank you

@albertfuentes552 2 года назад

Thought I was watching TV 😂😂. Good information thanks👍

@dr.c.artorius6490 4 года назад

tq tq for the wonderful vid lesson... (two-thumbsup)

@RobinundertheHood 4 года назад

Thanks! Means a lot!

@adriantomsa6662 5 лет назад

Sorry can you tell me something about this situațion? LOW PRESURE =12,5 bar And High PRESURE =10-11 bar? With engine started

@TheCoatneyadkins 4 года назад

We use psi over here instead of bar. It kinda sucks.....I'm as American and I prefer using the metric system, but I usually can't Because hardly anyone I work with speaks or thinks in metric units. It's crazy, we need to move on with the times over here and adopt the better ,easier, system of measurement. ... every nut and bolt and torx etc etc fastener on every vehicle sold in America for the last 20 yrs have used METRIC fasteners....but SOOOO many ppl still use fractional /imperial/sae tools. Despite them being slightly larger or smaller than the fastener. They Just CANNOT seem to give up on that fractional crap. I'm metric gang all the way though. Lol

@TheCoatneyadkins 4 года назад

Sae is so stupid, it's harder to learn in the first place, confusing .... it's just garbage. Everything being divisible by 10 is so much easier. Fuck a 9/16" Socket or a 9/32"socket and a goddamn 5/8" wrench lol Long live the 10mm !! Hats off to the 8mm and the 12 mm respectively. Lol and big shout out to my t25 and my t27 fasteners I ain't forget about yall, that's my jam. Hehe Shout out kilopascal and bar also..I don't fuck wit yall as much but I got love for ya lol Big ups to liters, fuck cubic inches dem ones bitch made. ..metric gang bang! bang! I went from civil to full goon to fast, didn't realize how bad I hate sae until I started ranting about it, a clear line has been drawn in the sand for me from this day forward. Metric gang whose wimme!??!

@RobinundertheHood 4 года назад

Adu, these are extremely high pressures generated by the system. A static pressure check would tell you something more about the charge. If withing normal readings i.e. 2-4 bars equally on both sides your system may suffer from some severe blockages or the ac compressor steering problems.

@spettro9 2 года назад

Wow, thanks, however: - Wouldn't call Manifold Gauges "Basic" Tools, but ok... $50 for cheapish ones, fine.. - Service station? So having someone check it for you? Why make this video then? - Where does one get that chart for a given car? lol Seriously.

@efrensaclolo7021 2 года назад

My Low is 30 and my high is 200 and no problem it is 40 degrees inside the car until I will go up the hill in a 95 degrees weather the a/c quits and the temp needle goes up to almost red zone engine temp.. but after turning it off for 2 minutes it will start cooling again again and the engine temp goes back to normal.What is the problem? I replaced the condenser and dryer/filter,I vacuumed and charged,Still doing the same thing,It still quit and overheat,2 minutes off and it will go back to normal again.Should I change the compressor?please Help,Thank you.

@faizmirza4478 2 года назад

Why the a c temp. Is not maintained,suction pressure is 40psi and discharge pressure is 130psi, amps is 16, gas is R134A. What is the problem ,can u suggest ????

@woundedplayz9362 10 месяцев назад

ive been trying w the car ac i got it filled said my condenser was clogged changed it got it refilled still blowing hot before itd start run cold for 15 mins then go hot but i just got home when hooked up the gauge and low side was chilling at 150+ i turned the ac on it instantly went to 0 any thoughts? they said possibly the evaporator idk

@ach5084 3 года назад

2002 s10 v6 ac issue My static pressure Guage test with engine off and or the ac off either way is 90 Lbs on low side and 100 Lbs hi side . When I start engine with ac on the high side climbs to 400lbs immediately the low side drops to 30lbs or so and the clutch shuts off What's My problem seems it holding a charge but hi side build is clicking the compressor off and the accumulator is NOT Cold or sweating. I changed this Florida trucks ac when I got it with 134 and one of them ambient temp gouges that put you in the green zone. But after a week stuff got weird. It does blow cold sometimes why driving but now it's acting odd . I'm about about buy new accumulator and orifice and new line seals and evacuate and redo it all. What could be the issue here ??

@melaniememe7519 Год назад

Nice very informative Great presentation Good job very informative I like the information. Very helpful thank you for taking the time to create this content

@RV77JONAH 2 года назад

Video covered over pressure but not zero pressure on the HP side... Shame, was hoping for a lead...

@0foxgiven 2 года назад

I was wondering where I have seen you before and finally came to me...the videos were very different 9 years ago haha

@selamatsalim2368 3 года назад

Oil compressor are important 2.it will circulate in ac system less oil compressor will damage to much oil ac not cold happy diy

@joefoisy3378 3 года назад

What about if pressure seem to indicate normal operation yet output air temp is not ideal and low side lines not very cold

@RR31982 Год назад

Awesome, awesome video! Very informative! Thank you for sharing! 👍🙏😊

@rotfan77 3 года назад

Thanks for making this video, I wasn’t sure if my low side pressure was a little bit too low but with your help I was able to figure things out. Thanks

@mohammadsaadeh8545 2 года назад

Hi, Thanks for your perfect explanation Can you please advise why When I switch on AC the compressor will click three to four times before back to normal

@SkydivingKiwi 10 месяцев назад

Best microphone ever. Looks dubbed :P

@ernestoramon3700 3 года назад

Mine showed the opposite of high with low. Instead I have blue 60 and red 140

@jesusibaibarriaga2645 4 года назад

I got an audi A4 with 30 psi on low side and 150 on high side and wont cool any ideas?

@dillonostrander5286 2 года назад

So what if nothing builds pressure with jo fkn leaks?

@freeatleast Год назад

Good video, unfortunately it didn’t answer my question.

@warenmann1042 2 года назад

Could not watch it. Why the music, it's irritating ...

@neil1786 Год назад

What if the High side never builds pressure? Already changed the compressor. Still only getting 40 PSI on both sides and it’s not taking refrigerant from the can.

@dsteve6002 Год назад

Did you find out

@issamadam9352 3 года назад

Great informations.Can talk about pressure gauge readings of variable and fixed stroke compressor ?

@jerrygragg4489 3 года назад

I have a 99 Silverado 1500 four-wheel-drive my AC is not blowing cold it’s only blowing about 70° low pressure gauge is just under 40 the high pressure gauge is just under 250 I don’t understand it seems the gauges are in where they’re supposed to be but I can’t figure out why it’s not blowing cold if you could help me I would appreciate it

@imlikerhettbutler5093 2 года назад

My truck is 30psi low side blows cold. Maybe a little over charged on yours

@Rhonda858 Год назад

What does it mean when the temperature outside is 95 degrees Fahrenheit and the low side is 80 psi and the high side is 120 psi what does that mean it could be?

@dsteve6002 Год назад

My exact problem and car won’t take all the freon

@c956rubber 3 года назад

What if my car is on idle and blows warm air, but gets pretty cold when my car is running...the low side is a little high than 30psi and declines when I accelerate...the high side pressure gauge stays normal, what can it be please help...thanx

@FeR-kt1jt 2 года назад

maybe overcharged or cooling fan

@slimskullsgaming 2 года назад

I replaced my condenser and dryer and vacuumed my system then added refridgerant and now my high sides fluctuation from about 250 to 200 but it only goes down when my fans kick on what could cause that?

@imlikerhettbutler5093 2 года назад

Sounds about right, fans cause air over condenser cooling the charge.

@hugoayala6472 4 года назад

My the high pressure side goes all the way up

@acrepairnearme 2 года назад

What subcooling should be for r134A?

@yabasvlog3439 Год назад

Great

@jamesdixon2860 Год назад

What should the static pressure be ?

@talpinsky92 2 года назад

Is this like robin as in robinair

@RA-lk1vz Год назад

ok but how do you remove too freon?

@rawimpact Год назад

But what if static pressures too high? Cmon man please give us all the scenarios

@kellismith4329 Год назад

Ststic pressure too high would be uncommon, possiby if seriously overcharged

@mehmetkalkan6789 4 года назад

thank you for your nice description

@frazrajput618 4 года назад

Dear, i like you very much.

@All-about-everything 2 года назад

Good radio voice

@babybouncing-yh1ui 9 месяцев назад

Thanks

@edilfredvillena5644 4 года назад

Hi Robin.what if I got a low side pressure of 35psi but only 90psi on the high side with ac on what does this mean am I having a bad compressor?

@RobinundertheHood 4 года назад

Hey Edilfred. Start with checking the refrigerant level is correct. Checking the static pressures would be a good idea. If below 30 psi your system is undercharged. And if you're sure the system is charged properly, these readings you've got may indicate several issues. It all depends on the system layout, compressor design etc. 35 psi on the LP is definatelly too high reading and IMO relates to some compressor's suction problems. This may have a root cause in the compressor steering valves (if applicable, e.g. ECV, MCV) or in the expansion valve, if your system has one. If this is a scroll design compressor it might be the seals between the scrolls. And the HP reading with 90 PSI is too low too. A stuck open TXV may result in this, but then you would typically hear some excessive noise from the compressor. Let me know the vehicle model so we can find a more accurate diagnose of this reading.

@edilfredvillena5644 4 года назад

@@RobinundertheHood A 1999 Nissan mavima V6.I,ve replaced the evap,expansion valve and dryer with new ones and leak test by soap and water and its good no leak

@ethandonohoe 3 года назад

Good video.

@williamkennard4663 3 года назад

Great video

@alial_tamimi4061 3 года назад

Mr. Robin. Are you rely on the reading of the sathatical pressure for each measure to see the level of cooling fluid? And what values are required for that

@kellismith4329 Год назад

It is best to connect the guages with the car shut off, both sides should be equal and should be around the pressure indicated on the chart for whatever temerature your surroundings are at the time. In most cases you would not access this unless your machine is not cooling and your static pressure lower than expected on both sides because there is a leak somewhere in the system that needs to be located and repaired before rechargingbthe system

@UmarFarooq0300 4 года назад

i am from Pakistan. My Hilux Pickup Lower side pressure is 50psi & high side is 225 to 250psi i clean Condenser,cooling cooler & change the Filter. but the cooling is not good.what is the reason?

@cire80 4 года назад

Those look like good numbers on an 85 degree Fahrenheit day, did you solved the problem?

@UmarFarooq0300 4 года назад

@@cire80 No

@mohammadyousuf-cg9yg 4 года назад

Farooq bhai compressor problem hai

@anawa2006 3 года назад

Over charged

@ialien2077 4 года назад

Any idea what it costs to have the freeon removed?

@kellismith4329 Год назад

Can be removed at no charge if you depress the valve and stand back a bit

@daywlkr8 Год назад

is all of the audio voice over rofl?

@adamruss656 4 месяца назад

get off the floor. why are you laughing?

@fortnitemobilevidvid9643 3 года назад

Do the gauges need to be open or closed

@kellismith4329 Год назад

They do not need to be open to read pressure

@philliptaylor5981 4 года назад

Thank you! On my gauge my HP needle is fluttering. What would cause that? Is it a leak? Faulty reed valve in the compressor? Blockage? If so, can I diagnose this failure on this fluttering on the gauges alone?

@wiley0714 4 года назад

If you have fluttering on your high side needle it’s the flux capacitor

@BlackRam57 2 месяца назад

@@wiley0714 what’s a flux capacitor

@GUTOMOFFICIAL 4 года назад

why does the talking look weird like dubbing.

@TheCoatneyadkins 4 года назад

That poster from the website is pretty handy, thank you.

@RobinundertheHood 4 года назад

I'm glad you liked it! And if there is anything else I should work on, please let me know!

@steron110 4 года назад

How do you get the poster?

@KillerkoUK 2 года назад

You could have go through all the other possible issues, but I've found what I was looking for in that PDF, so thanks!

@wiley0714 4 года назад

Where is the Batman

@littlebilldam 4 года назад

Old coins

@tkquazzad7953 5 лет назад

Gyu

@awatchman5945 5 месяцев назад

Get to the point !

@luckymex58 Год назад

Robin is a girls name.

@GAVETHEFUCKUP 4 года назад

If you like engines I like quantum physics. Would you be able to create a supercharged hydrogen converter and atomic pressure chamber with a burst charge aimed down with a psi itamizer and pressurized containment cooling. Hydrogen flying cars is basically the idea