AutoZone Car Care: Diagnosing Car Air Conditioning Problems
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- เผยแพร่เมื่อ 12 ก.ย. 2024
- If your car's feeling a little more toasty than usual, you might have some air conditioning problems. If you're thinking about taking care of some A/C repair, start with this helpful guide. We'll show you how to diagnose A/C related issues, whether it's something under the hood, or related to your cabin - so you can stay cool behind the wheel.
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Hello Bruce!
Just wanted to thank you.
I had to prepare for an interview in 7 days after not knowing anything. I found your videos and watch them several times, took notes and even listened on my ipod on my way to work. My interview was great! They said they were truly impressed of all I learned in such a short time.
Keep posting videos. You are awesome!!
First off, love the channel, and your easy to understand repairs and methods. THANK YOU AND KEEP THEM COMING. My 2002 Merc Benz S430 (W220) A/C stopped working after I replaced the windshield wiper hose (with the heater wire/ cable inside). The unit small red light is on indicating the system works, but will not blow cold air. The clutch does engage, on then off, constantly. The typical reset feature/ trick doesn't work for whatever this error is currently. I checked the relays/ switched and replaced them as well. Assuming the system may have been low on refrigerant, I filled it with what it took in, which appeared to be almost two full "tall" cans of AC Pro. Reset the system and the air came on "absolutely freezing cold" for about two minutes then shut off again. After resetting and attempting to make it stay on, it wouldn't reset anymore after four attempts. I noticed a clear liquid had leaked from the bottom center of the car down the driveway to the rear of the car, no smell or color, but thicker than water.
The next day, with the engine running and the air refilled and reset once more, I heard a loud hissing and bursting flow of air or spray from under the hood, front drivers side for about 40 seconds then stopped. I believe it was a pressure relief vale of some sort !!! Scared the &%$#@^& %$#%^&%#@ out of me to be exact. The clutch still engages, on then off, constantly. Whats wrong with the cars AC ????? What would you recommend I check or replace???? No AC for the past four months now...
What a great video hahah the old mans voice at the end is very soothing
5:27 "this could indicate a fully open expansion valve or a faulty orifice tube, or more likely, a faulty compressor or clutch"
it could also indicate that a piano fell on your vehicle, causing it to function in a way different than intended. Alternatively, there have been reports of loose white rhinoceros driving their horns at full force through a/c condensers lately. They seem to be attracted to the refrigerant smell if you have a leak, though this has not been confirmed. Who knows...
Well I just learned something. check the gauge first with the car off. He said he was expecting to see 120 to 125 PSI with the engine off and new immediately when it was 80 PSI on the lo and high side that he had a leak. Good stuff!
So basically with engine not running....on the high and low side....."if" u have any liquid refrigerant in your system u will have approximately the same pressure as the temperature is outside in Fahrenheit. So if it is 80F outside you should have 80psi. If it is 100F u will have 100psi. This is s good indication what shape your system is to start with.
One significant omission in your video. Albeit a critical issue for accuracy
Ambient air temperature and percentage of humidity to calculate accurate pressure readings.
The only way I know to do it is with the addition of another tool. Harbor Freight sells them. It is a venturi type air vacuum pump that hooks to the air compressor and to the middle like of the gauge set. The air from the compressor flows through and sucks the air out of the ac. The thing is it works a lot better with a more powerful compressor than the one shown in the video. I had one, a wasp made a nest in the pipe and clogged it all up. They are only 15 dollars and make a hell of a noise.
I checked to make sure I didn't have the video playing at 2x speed because every few words he would say legit sounded like...
"And then you checktoseeifthisisworkingproperly and if so youwanttogoaheadandcheck under here with a flashlight..."😂 But anyway, thanks for the video!
The service port is right above ac Compressor. There was no way to bleed off pressure after injecting dye. So when you disconnect connection of dye can you will spray a little dye in general área where you disconnected it. You didnt follow the whole LP line nor HP lines throughout system. Isnt it possible that dye you seen on compresor is residue from over spray from when you disconnected bottle? Your hands had dye on them so it did spray. If you would have cleaned área after disconnection then i would fully agree. Not 100% Compressor was leaking
I wanna watch this video all day
شــُـكـرً لــّـك :
،Thank you very much
Very Excellent Lesson.
Keep Up.
I'm an Aircraft Engineer and QC. Inspector, Yet,,,
I benefited very much from your instructions,
so thank you again and again.
I’m very grateful for you
. An Arab, Engineer
You said at 4:51, it is properly charged when it is between 20-30 PSI on low side but at
5:12 on low side the psi is over 40PSi so it s not normal
You should remove the gauge from the red protective plastic tube before measuring.
I Hate when I wear a necktie to do auto repair lol
Great Video! Now I know what readings mean.
2000 Jeep Cherokee... Will not Take Freon... Compressor worked great in the other jeep 96 cherokee country both 4.o but i had to change out the backs because they were in different positions. 96 back of 2000 top of comp. I had it vac. and put ruffly 4 oz oil that it took no problem. wont take freon. i know its pumping for sure because i took off the low side sensor held down the valve with the clutched manually kicked in with trying to put freon in it and it blew off one of the lines going into the condencer. i replaced o-rings and put back on. So ya its building up pressure but not sure on the suction part. as far as the power/fuses etc. I start the car turn on A/C controls, Hi/max, with a test light i have pwer on both wires coming from the compressor . the ground on the comp. shows to be hot too. Both incerts show hot on the low pressure switch /cycling switch unless i unhook the high side switch. then one side hot no light on the other insert.Then i try to bridge it over and it still dont kick the clutch in. If i try that with it showing 2 hots it blows the big 20 amp fuse. Same if i try to bridge it over from the ac relay on the fuse box. the fan shows 2 hot coming out of the switch going to the fan but 1 hot 1 ground going in the plug. When I unplug the ac compressor i still have power on the compressor end/plug and both wires but no power on the plug wire coming from the wiring harness. Even with everything unhooked. low side high side fan and ac compressor i still have power on the compressor. both wires... Only time the wire from the harness has powe is when i plug in the ac. Is that right?? My low pressure switch 4 ports has power on 3 out of 4 ports/slots. Car running ac controls on, if i unplug my low side sensor i then have a hot and ground on the high side switch instead of 2 hots but low side switch has 3 hot 1 neg. unplugged... i did test the wire thats going into that port and it has power going in the switch but no power in the port of the switch. If i hook the high side back up, again i got 2 hot ports on the low pressure switch. Even when i have 1 hot side other neg with the high side unplugged = it still wont cycle the clutch but it dont blow the fuse then. Do i have a ground somewhere maybe causing it not to let it take freon??? P need help caus i cant afford to take it to a shop...
1:58 Always make sure to consult your "rapair manual" lol
Bruce, that was a great video
Get in da zone autozone!
Dude, I don't usually comment, but let's just say I had to like and comment this video!
In my car. after switch ON A.C. after some time compressor stop stuck, clutch trying to engage but compressor stop moving. Engine speed also reduce. Clutch start ON and off. If we stop the car for 1 hour and again we try to switch ON A.C. , it will again Star working give, in side car A.C. give cooling but after 2 minutes again compressor stuck and clutch start ON and OFF. Please give some suggestions.
Great presentation and learned a lot thanks for the tips Bruce.
Stop up
I lost confidence when he used the thermometer WITH THE SLEEVE ON....smh
Same here. When i saw that his voice began to sound like the voice of the teacher on the phone in a Charlie Brown cartoon lol
I know that's crazy
wonderful lecture thank you
Nice explanation of various meter readings and what they mean.
While a/c system pressures aren't static, they are based on ambient temperature and operational status of the system I would say from those readings that you have a leak and are in fact low on charge. At this point you should introduce dye into the system to find the leak, have the system reclaimed, replace the leaking part and the accumulator, place the entire system under a vacuum, seal the system under vacuum to check for potential leaks, and then recharge it with fresh oil and r134a.
could u pls upload a video about ac switches condensor fan low pressure and high pressure switch circuits., and the electrical sides of ac.?
@1morelle...compressor the Guy with moderate low low but extremely low high: orfice/expansion valve or clogged evaporator. Both perhaps. Even if compressor, u have to replace it.
Never wear a neck tie when working on a vehicle. Even though it completes the look of most coveralls, this practice can have potentially hazardous consequences. Please take a moment to think of your loved ones.
Michael Block But if I take my tie off I'll just look like another greezey mechanic. ...And clip ons are for hacks!
Lmao
Please take off all rings and jewelry also. Especially necklaces or pendants
True as a medical student I rotated through the medical examiner's office for a month. I saw people killed when their clothing pulled them into machinery and were crushed to death . one guy I remember was killed by a stamp printing press when he was pulled in up to his mid chest and crushed and this was back when you had to lick the stamps. As a urologist , I have also seen blue jeans get caught in a PTO and wring all the skin that would normally be concealed by your underwear right off. It only takes a split second
Kevin Sanders MD hello, There is a company across the street that we also serviced, we were on the roof working on the A/C SYSTEM, heard sirens, the other company, there was a young man with LONG HAIR and was PARCIALLY SCALPED YOU COULD SEE IT ,,,,, OBVIOUSLY GOT HIS HAIR COUGHT UP INTO MACHENERY, all I can say is it looked gross . thought of an Indian movie .
Veers 🇺🇸🇺🇸🇺🇸🇺🇸
Im getting 30-50 low and 275 high max.
Can someone please tell me are you suppose to open up the top red and blue turn valves after connecting the low and high port connectors to determine the pressure? My Set has no instructions. I connect mine and I get no readings, but there appears to be R134a on the high side because when I adjust the fittings, I hear hissing. My readings are 0, and O, and I have no AC on a 17 year old car, never charged.
You dont need too. There are little ports in the guage set that lets refrigerant in to give u a reading. You only open the guage set when you're servicing the unit
This video helps me understand why that disguised cop was smashing the windows in the AutoZone at Minneapolis.
Resting pressures closely match outside temperatures NOT 120psi.
Unless you live in Death Valley.
Normal pressures 30-40 low side low side and 2x-2.5 x outside temperature high side while operating
134a
where does the problem of a compressor with the clutch that operates intermittently? Thank you
I love how the voiceover is warning how refrigerant will harm your skin and immediately they show the host handling the can with no gloves
Need to remove the thermometer from it's sleeve.
haha i thought i was the only one who notice that
It’s made to be used in the sleeve
Wrong.
I noticed that
I noticed that first thing lol was wondering if anyone else did
I've had that same little compressor for years now
Definitely Autozone quality training lol...
And a quality youtube reply with that!
Forgot to mention about turning the recirculate switch off when bench testing. It's within the first minute of the video
My 08 legacy had a compressor put in and the high side was very high and low side was bout normal..is it the expansion valve?
More than likely
b 4 checking 4 leak u should check the a/c presure first. if is low then u should look 4 any leaks my friend. iseen u doing everything wrong it first u said that everything looked good then u said that it was a leak around the conpresor
EXCELLENT
I tell you what, this is a good video
Thanks for the kind words! We're glad we could help out.
Love this video
I checked all the fuses and relays, which seem fine, but the clutch is not turning when i turn ac full blast. Is the clutch broken?
Do you have to add oil if you just vacuum it down to refill it? My ac comes on and is warm air yes the ac is on and the ac pump come on but the air is warm coming out 4 years ago it was cold I let it sit for a few years then I got it back out the shop to drive and the air is no longer cold it room temp but there is still pressure on the lines what do you think I should do? Thank you for your time have a grate day. Ps it’s a 2001 Mitsubishi Eclipse Spyder gs 2.4L if that helps any
I wish he explained more readings on the gauges because my gauges are reading Low Side: high pressure... High side: low pressure. In any case it is No BUENO.... SMH
Id low side and high side same pressures?
Compressor or expansion valve
was that a comp leak or when you took pipe off low side you didnt clean off residue .?????
Nice to see Bill Oddie is doing ok after the Goodies got taken off TV !
also did you mention all the problems that can cause ac not to work? or are there more...I did have a bad ac fuse connection once that was an easy fix..thanks
Love from my heart
Great video thank you
Good video thanks for sharing
Good video!!
Good morning
I really find this interesting but not so helpful because you don't show me the damage parts .
Thanks
This is a good video! Most everyone never mentions engine off readings. Since watching this I always check for restrictions with engine off readings or sometimes I may run it and see how long it takes for both hi and low to balance out after the engine has been cut off.
I have a truck I put a used compressor, a new orifice and a used dryer on. I vacuumed it down an hour and recharged it. The very best vent temp I can get out of it on a hot day is about 64 degrees F which is better than no AC at all.
Is it possible that a new dryer would fix this system or is it likely that a new compressor and dryer will fix it?
I'd like to know how important it is to replace the dryer every single time the system is cracked open.
Dis a good video!
Does AutoZone loan a/c recovery machines?
To check the temp turn off recirculated air & Low Fan
The reason they tell you not to do that is someone has actually done that.
so when does he add that OAT to pressure???
You mean to find the delta t across the evaporator?
With AC compressor running my guages read low side-15psi high side 375psi and warm air. When cooling fan kicks on low side 40psi high side 220 psi. How can cooling fan affect AC psi?
Looked at their site and they don't offer any of the AC service tools he shows here for sale or their loaner tool program.
Mr Bonebrake? He should teach karate.
I am confused is the AC pressure different for different vehicles? You say it should be around 125 psi and I found a differnt video that says it should be around 70 to 90 psi with engine off.. and read some forums of people saying it should be around 50psi on both with the engine off... who is right.. who is wrong? So my 325i 2002 bmw should be reading about 125 psi on both the low and high with engine off?
C D I think 125 psi is normal for this truck. It will be different for your car. I'm assuming that it should be close to 125 though
it depends on the current ambient aor temperature. get a good set of guages amzn.to/2Msc9ya and check the service manual for exact info
My a/c start up only when i push the engine up to very high RPM for a short moment, after that all is working fine- normal also in parking position than the a/c work normal , with no high running rpm motor. Compressor and clutch is running, freon exact fill what the sticker says and no leak, all testet. What do think is wrong? E valve - drier, compressor but he runn after puhing tha gas padel quick for hight rpm.....? thanks all here
WEAK CLUTCH COIL, LOW VOLTAGE TO CLUTCH COIL, AIR GAP TO WIDE BETWEEN CLUTCH HUB AND PULLEY.
Is that ac fan supposed to run constantly or only when the freon gets to a certain temperature ? Would the fan ever not be running when car is running ... good video
Obadiah Yedidya , are you still using freon? what year is your car?
OffGridNorthwest ---> 134-a is being used in a 2006, thks for reply.
O o o Reilly’s!!! I work at Autozone lol
hi how about if the static pressure is not equal? like 50 psi on low side and 180 psi on high side, outside temperature is 70 F..what is causing this?
why don't you show us the damaged parts, so we know what to look for? "every thing looks good" does not help us..
Thanks!
Hello sir, my car's ac cooling properly but humming when compressor engaged and rpm is low or idle. This hum loud in cabin, not outside. But when increase rpm, humming decreased. What's the problem sir?
Thanks for your posting.
thank for you video.
Great 👍😘
What should be the required amount of refrigerant oil in an A/C system. How is it measured?
I seen others weight the freon and peg oil cans as they are charging system
My 04 gt surged bad when ac is on
When I accelerate the car at idle when gauges are hooked on my low side drops and clutch turns off? Then it turns back up and jumps up into the 90 200 PSI down back 250 I have no idea I think it may be a bad clutch or condenser.D you know what this is can you help me out this would really be appreciated thank you and having this problem for months now and I can't figure it out.
Thank you.
Great vid
wow, very cool !
Great clip thank you!
half fixed looking for more info
"I tell you what"
Very Very nice. Thank you
changing ac condenser 2009 scion
Didn’t he found UV dye in the plug because that’s where he plugged the connector of the Uv dye can?
At 4:53, when Bruce showed 20-30 psi low and 200-300 psi high, will this be higher due to ambient outside air temperature?
0:51 It’s not a problem, it’s a ME problem!
5:10 Does anybody know what brand gauges are being shown for this short period on this video? They look nice and very clear and easy to read. Cannot find them on Autozone's website.
JRobert111111 i just use these and they work great amzn.to/2Msc9ya
its all instructive for me and hepl in my hobby
good work.
My car over heat when i turn the a.c. On
what could be the problem
Is it the fan ?
yes,
Sir I am experiencing a problem with my Toyota Yaris (2008) Aiconditioning. When I am running around 60 - 80 kph (let say 2 for 2 minutes) the AC blows hot air in the air oulet, and when I reduce my acceleration or in Idle position the AC works perfect.
I already recharge/flush system with fresh 134A, replaced the receiver/drier. All gauges are working fine during idle position of the car (low and high side is perfect). My compressor is only 9 months old so i dont see any issues with my compressor.
Hope you can share your experience with me. I am from Qatar. thanks.
+mel roguel You probably have an overcharged system because you did not put the right amount of 134A. It is likely you have an overcharged system. What are your low side readings when idling?
+Be enlightened when idiling the low side readings are (42) & high side is (270). I reduced the freon charge to (30 to 200) but still the Compressor is disengaging when my car is running in high speed (60-80 kph), but in idle the cooling is perfect. We suspect that there is some electronic faults signaling the compressor to disengage. Hope you can help us find the answer. thanks
freon is a trade mark ,,,the real word is refrigerant . just like we don't say its puron ,aka 410a.
I had EBAY send me a letter from DuPont chemicals regarding just this. You don't know how many trade names there are out there that we use to describe ordinary objects until you get the "trademark infringement" letter from the manufacturer of the material. I put Freon.. it is a trade name for a DuPont chemical trademarked blend and I had some generic blend listed.. REALLY??? Also don't call that white tape you use for pipe threads "Teflon tape" as that is a trade marked name as well... list goes on and on... Talk about "aspirin"? Nope unless you use the product from BayerCellophane? its plastic wrap unless produced from Innovia Films Ltd in EuropeDry Ice? well its just plain old solid CO2 unless it was made by the Dry Ice Corporation of America (trademarked in 1925)Taking the Escalator at the mall? its a motorized walkway unless you read the nameplate and it was made by the Otis Elevator CompanyGoing to the Laundromat? well it was a Westinghouse trademark, registered in the U.S. in the 1940s (automatic washing machine) and 1950s (coin laundry) but now expiredOff topic but interesting..
bug Den R12 is commonly referred to as Freon.
Why is he making connection with the engine running and hand near the belt?
is the compressor connected to a relay or fuse?
u guys say the ac clutch is workin lets go from there well my ac clutch isn t workin at all have a video on that olease ty
what if low is reading 30-35 psi and high reading 50-55 psi?