HOW TO FIND A CLOG IN YOUR CARS A/C SYSTEM
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- เผยแพร่เมื่อ 1 ต.ค. 2024
- In today's video we take a look at a 2009 Honda Odyssey w/ a 3.5 V6 engine. The owners complaint is that the air conditioning is not cooling even though they already charged it with refrigerant. The other symptom they have is that while the a/c is running, freon or refrigerant blows out of the back of the compressor. Refrigerant shooting out of the pressure relief valve is a sign that the system has a major clog or blockage. Watch and find out how you can locate a blockage in your a/c system using a thermal temperature gun.
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Just FYI my explanation of how the A/C system works is very simplified and meant for a general understanding of how an expansion valve works. I know some of you very educated viewers may give me a hard time. I’m just trying to help the regular Joe diagnose and fix his or her A/C this summer. Thanks for watching!
It was a great explanation in terms of solving the problem and fixing the car. That is what 99.9% of people are here for, anyone who wants to go more in depth can go to Wikipedia or an HVAC channel.
Exactly! Thank you!
Thank you for the clarification. I know you're a very smart guy and a superb Mechanic but my initial reaction was WHAT???! At the end of the day, I'm glad the problem was resolved. Keep it up, Man!
Great explanation! I like you corrected yourself saying refrigerant, instead of freon. That took a long time for me to break the habit of calling it freon. For your youtube community. Freon is R12. Freon is the brand of Dupont. It would not matter if you called freon your viewers understand. Its difficult to create video content and explain the work you are preforming. A lot of brain power. Enjoyed the video.
@@713jtmechanic8 Is R22 called Freon also? I’m not sure. Thank u!!
Great basic explanation and how to on the diagnosis. The obstruction essentially acted like an orifice tube. You’re helping people understand complex mechanical issues and hopefully save money on their rides. I think your in H Town like myself too.
As a master technician myself, I think you did a great job on this video! THANKS!!
Eric, your local JC / tech school needs you to teach
No question about it
I agree, you're a great teacher. You should look into it. Good pension and plenty of holidays. 👍
Better money fixing, and repairing them however. Especially if you're decent at it. This guy probably gets good word of mouth, and thus plenty of new and repeat customers.
He is teaching. 👍 He probably doesn't get paid too well, but he's putting in the effort to help others learn.
Didn't know that there is a pressure relieve valve that vents like that. Good information
I didn't know either!
Learned something!
Yep, called high pressure relief valve to prevent the compressor and or evap, condenser to rupture blow with much force.
Located directly right on the back side of compressor itself
@@abechavez1876 its there to stop the evap from popping and venting all the gas inside the passenger compartment which would cause an accident, kill somebody and be a massive liability for the auto maker.
A very informative video, Eric! Many thanks.....stay cool down there!
Very confidence and intelligent work, (A L A) thanks. Habib Auto all day way from Ghana Accra West Africa
It is incredible how much you know about how the ac system works as a whole. I've worked on my car but never actually knew this. Something in my ac blew and during my research I ran into your video. Absolutely amazing. Thank you so much for all the information. This helped SO much!
One little correction the refrigerant coming out of the compressor is a gas it doesn't become a liquid until in goes through the condenser. IE it condenses the gas! Great videos bud!!
Correction, where there is a restriction, the condenser stops flowing and fills with condensed gas which is liquid. When the relief opens, the liquid boils and sprays a mix of liquid and gas. Safety first. Getting sprayed by this can cause severe frostbite. Think taking the radiator cap off an overheated car. Boiling liquid blows out under force. Same principal, but with refrigerant. Both are dangerous to get sprayed with.
I love your video's sir!! Thank you for explaining things, so that even a car dummy get it. If I come near my Xterra with a screwdriver....she backs up and asks me "What the hell are you doing" in morse code using her horn!!!! LOL
Lol
That’s crazy! I have two of the same vehicles in my shop at the same time!
Looks like a man-made orifice tube from jacking up the vehicle from the front🤔
I think you might be onto something there. Thanks for watching bro!
Great diagnostic technique as usual dude. To clarify one thing, an A/C compressor is not design too and should not be allowed to pump liquid, pumping liquid damages an A/C compressor. The compressor discharges vapor into the condenser and the condenser, as the name implies “CONDENSER” condenses the vapor into a liquid.
Wow, an A/C video that I actually understood and learned something! Thank you for the clear presentation and explanation. 👍
Well I THOUGHT the refrigerant comes out of the compressor as a high pressure gas and becomes liquid in the condenser with a few degrees below saturation at the exit. Correct me if I'm wrong.
You are correct. I was just oversimplifying to explain how the expansion valve creates the effect of coldness in the lines. That way people understand why we are looking for a significant temperature difference when trying to locate a blockage in the system.
@@ADVANCEDLEVELAUTO For the record I wasn't trying to diminish your work. I think at the end of the day (I hate that saying but it works) people will understand.
The compressor cannot pump liquid at all, in a closed system liquid acts as a solid,this why your brakes work , any liquid cannot be compressed, and if the compressor gets liquid to it something is going to give, but it will not be the liquid, the valves , the connecting rod , the rings , it receives gas and ejects gas hot gas, that goes to a condenser that condensers to a liquid as it throws off heat, there is no such thing as cold, there is only a lack of heat, in absence of heat thing feel cold, the condenser if air is properly flowing through the heat that has the refrigerant expanded into a gas state, leaves the the refrigerant shrinks back to a liquid state
I'm 666th person to like your teachings !!
Nice lesson
It goes in as a low pressure gas to the compressor and comes out as a high pressure gas then it gets turned into a liquid in the condenser then from there it goes to the expansion device to go from a high pressure saturated gas liquid mix to a low pressure saturated liquid mix then evaporates back into a gas in the evaporator. There is never liquid in the compressor as it would hydrolock.
I think it comes out as a superheated vapor out of the evaporator after absorbing all the heat from air. I did a calculation based on the 4 degC outlet temperature and the duty of subaru system of 5.1KW and if you look at the pressure and the thermodynamics of the refrigerant at the outlet it needs to be superheated vapor. I liked the video but I agree with you.
Yeah your correct. Refrigerant will boil in the evaporator when it picks up heat then turn into a superheated gas carrying the heat to the condenser outside to turn it back into a liquid then it will repeat the cycle. It's the refrigeration cycle and most HVAC techs don't know what a refrigeration cycle is.
Thanks Eric for the a/c video! I watch every video!
Awesome! Thank you!
Great diagnosis! Exceptional job of explaining how a vehicles a/c works & the inner workings of the refrigerant process!
The reason was the condenser restriction was metering hot gas thru the restriction lowering the saturation pressure Compressor only compress vapor to increase pressure and temp Slugging is bad I disagree with using air to find a leak use an inert gas NITROGEN CHEERS nice diagnosis
Well thought out video!
Consider becoming a automotive instructor! You'd be a great one!
U r one of the straight to the point, no-nonsense, car repair guy I follow on TH-cam. U r good!!!! I can easily follow and understand what you've just explained here.
The big question now is, why did the condenser plug up? The small bend at the bottom wouldn't have crushed enough rows to cause a blockage like that. That leaves the compressor failing at some point or the desiccant bag inside the dryer coming apart. Both of which will probably cause trouble down the road if the car lot didn't flush the system.
I'm not entirely sure. That is why I recommended that they flush the system out when they replaced the condenser. Thanks for watching!
The last row is on the bottom and was crushed.
it comes in on the top and snakes down.
in ________________________________________
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out ________________________________________|
Exactly how Josh C explained.
This type of A/C condenser has the one inlet at towards the top first row then it loops zig zags down from side to side horizontally until it exits outlet line at the bottom most row which makes sense as it was crushed bent upwards as shown in video.
It circulates differently than a radiator, where coolant entering can go flow in all rows across and it exits flows out all rows on other end simultaneously from all rows.
@@ratbag359 & @Abe Chavez Nope, your thinking of a serpentine condenser. This one is a parallel flow condenser. It does snake down but typically in multiple rows at a time. Pretty much all cars have used them for over 20 years.
You are 100% WRONG on what is discharged from the A/C Compressor. It discharges "Hot Gas" NOT a liquid.
You are correct, but there is a much nicer way of saying it.
Eric “ Estas pero CHINGON” 😎
The shop should’ve flushed the line including the condenser and evaporator to make sure no blockage. It’s a standard procedure by the book.
Yah only common sense
why high pressure switch did not turn compressor off before relief valve blows?
Thanks for the video! Keep them coming!
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 (also) 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??
Another compressor that didn't need to be replaced and another costumer that paid for the inexperience of the shop. Great video Eric
Luckily this vehicle belongs to the car lot. It is used as a loaner or rental car.
It may be possible that there was something wrong with that compressor, it may have been damaged if it was building up enough pressure to trip to relief valve. Likely not catastrophic but it may have reduced its lifespan. Kind of hard to know with these things.
where do you think the blockage came from? a failed compressor and a system that wasnt cleaned out.
@@DieselRamcharger yes exactly your meant to replace and flush the whole system out that's what they get for being cheap
@@neilmurphy845 yup. running a solvent flush isnt even expensive.
@markh3478
0 seconds ago
Great video . I had this same problem on my 1988 BMW M6 with only BMW OBD1 . Low side gauge reading a little high and high side gauge reading very low . System was overcharged by me trying to solve the problem with a Wal-Mart can and gauge . No luck. I guessed there was a blockage in the condenser so dismounted it , bought a small fluid pressurizable tank at NAPA and some stuff I think was called Dura flush . Its mostly pentane so flammable . I put it in freezer for an hour before starting . Pressure fed the Dura flush into the condenser discharge side at 90psi . Nothing happened for about two minutes so hit it again with more . All of a sudden whoosh and a gusher of gunk shot and spattered about 20 feet across my driveway . Glad I had on safety glasses . I flushed the lines to and from the compressor too . After new o-rings and assembly with an ounce of AC oil added to the condenser , 30 minute full vacuum and recharge with 134-a ( had already replaced TXV and STV POA ( car has rear evaporator , too ) I got 44F at vents with fan blowing on condenser, 2000 rpm fast idle on 92F summer day . Now get 225 psi on high side at 75F .
On my 2000 lumina, the pump runs constantly. It fluctuates from 40 to 50psi on the low side, but there is ZERO cold air.
What if your A/C works at idle but while driving aka revving engine? my low side pressure is high (100+PSI) and high side pressure is low. my AC blows ice cold at idle
My boys and I have 2007 CRV, civic and accord, all have dead air conditioners. What are the most likely culprits? We have an extreme heat wave here so appreciate any help
I have a question. I have a 2010 Honda Odyessy EXL and my pressure gauges when the A/C is turned off is the same reading of 110 psi on both the low and high side. So they are equalized. How does this tell someone the line is charged correctly?
While the Van is running and with both front and rear A/C turned on, my low side is at 55 psi and my high side is at 175 psi. The cabin air vent only gets to about 65 degrees. I have a new compressor and expansion valve, as well as condenser and evaporator.
A shop told me I was losing freon via my front evaportor, because I was losing pressure, but I don't think I am if my low side is still at 55 psi and high is at 175 psi.
I am thinking the A/C suction line maybe the cause of my A/C not working as all the major parts have been replaced several times, and still the A/C does not blow cold and Low side never comes down to range of 30-40 psi.
What's the typical differential temp should be between the temp coming out from the compressor to the output side of the condenser?
05:55 I agree the AC condenser is the cause of the restriction, but I bet too many of the the micro channels are clogged with debris from the previous failing AC compressor... I really don't think that one dent in the bottom of the condenser can cause the whole condenser to "clog"?
Great video!!!
Great Job Eric! I bet someone tried jacking the van up under the condenser and damaged it!
I have 2 older Civics and a Camry. All can be jacked up under the rad support. Found out the hard way that you cannot do this with an 08 Honda Fit. Stopped just before doing any real damage to the radiator and condenser but had to straighten out the rad support frame.
Hello
Thanks for the video,my Mazda 5 2012 does the exact same thing .When I touch the low pressure line ,it’s really cold but the Freon keep blowing out
Any idea what might be the problem ?,somebody told me it could be the pressure switch .What do you think??
Is the compressor coming on?What you're doing the same blowback and everything.But the compressor is not coming on.I had to manually kick it on
Thanks for the video.
I am facing the same problem like this in my jdm 2005 honda odyssey.
High side pressure line getting cool and sweaty.
Luckily it's still blow cool air.
Maybe i need to change condenser immediately..
Off the ac i have 2011 1500 dodge ram 4.7 2WD and theres no codes but only the ABS N ALSO TRACTION lite on but it peel out It Accelerate shits fine but take a while to pick up pedal down and it kinda like choke i seen that break switch thing its brand new well looks like it idk brother help
Hi Eric, I have a 2012 Honda CRV and When I have the ac on the temp guage goes up to about 3/4 way up and ac cut off. Then I have to turn the ac off and Turn up the Blower all the up and temp to High let heat come out. Doing so the temp guage comes down and the ac works. Today I turned the ac off and the blower on mid range. Drove for 250 miles the temp guage stayed at 40 degrees. Tells me my Radiator, water pumps are working good. The coolant censor is good. AC compressor is used was installed 1 year ago. When ac works it's icicles. I never changed the ac condenser. What is your recommendation? I would appreciate your advice. Thank you.
2021 rav4 hybrid, ac making hissing sound... any idea what is causing it? i replaced the expansion valve - same thing..... thanks
sir got my honda crv 98 gen1, got replace my drier, expansion, new compressor. but still cooling system is cold but not as cold as before. 30/170 reading. 30 seconds running compressor then it cut off. too quick the cabin not cold enough. , any suggestion sir?
Eric, I'm no mechanic by any means so with that being said i need your expertise about my 2004 ford explorer sport Trac. I have no ac in my truck. Full of refrigerant and when I turn on my ac i can hear a knocking noise and when I give it gas the noise will go away. It comes back but what could be the problem with it. I need help. Living in Oklahoma City it's way hot. Just don't want to waste money if I only need to recharge but IDK.
HELLO SIR, YOU EXCELLENT DID JOB IN EXPLAINING , HOW THE SYSTEM WORKS. THANKS VERY MUCH.
I think it's hilarious how some people throw parts to solve a problem to cover up the fact that they just are uneducated. It all comes out in the wash. Lol
You are number one...
I need help diagnosing my a/c. Changed out compressor, dryer and oriface tube which was clogged. No flush. Pressure switch also changed. Tahoe ac work for a few minutes then blows hot and quick cycles compressor. Also dryer freezing over.
My '95 Safari would take a charge, and cool for a while. When I would shut off the engine, I would hear that whoosh. I haven't messed with it much, as I also have a car with good A/C. I was thinking maybe the accumulator was plugged up. I'll have to check it out as this video showed.
my compressor is working and clutch is turning but my air is blowing hot but my expansion valve is cold but pass that my low side won't get cold
Need your help with my truck, had to buy a used truck because a mechanic burnt my good old truck to the ground, I purchased this used truck because it has a new engine with a warranty, but I don't think they programed the pcm the correct way after the install. Runs fine, getting 20mpg, really good mpg for a 4x4 with large tires, but the check engine light and the abs light stays on, reset the pcm a few times, lights go off while idle, but come back on after any rpms go over idle. Need your help, actually thought about driving to Houston, but Don know where you're located.
Very informative video bro... thanks much
Ac condenser was changed and flush lines but still blowing pressure from compressor 😢
I wish I had seen this a month ago. I have a 04 accord that was doing the same thing. Couldn’t figure out what was going on. The compressor blew out like that and everything! I just replaced everything!
The only problem I hear is that refrigerant leaves compressor as a liquid and changes into a gas in the condenser...it's actually the other way around...you can't have a liquid in the compressor...not in the suction/low side nor the Discharge/high side...
I only have a gauge for the low side and am trying to diagnose wny my AC doesn't get cold. Compressor clutch works as it is supposed to. I'm getting 90 psi sitting still not running and 90 psi while running. The lines don't seem to significantly change their temperatures. Where do i go from here?
I'm having the same problem. After recharging with fresh refrigerant started shooting refrigerant from compressor. I suspected that problem is in the high side. The low side lines become ice ,but strangely it shoots refrigerant from compressor. So I think the high side is being blocked. And I did change the orifice before. So I don't think the orifice I clogged.
I had put a new compressor, new condenser, new radiator, new expansion valve, new heater core, new evaporator on my car and my a/c is still blowing cold on the driver side but hot on the passenger side. I bought all new parts to have cold air but still not working properly.
When i turn the air on i hear a hissing noise coming from the vents
Just bought a 01 previa with the ac not working, The previews owner just had a new compressor expansion valve and drier replaced still no cold air. Pressure readings are similiar to this video 45 low and 50 high side, I noticed the drier is installed backwards would this cause a blockage and will this cause any other problems such as ruining the drier or other components thanks.Should I install a new drier or just turn it around, also I understand the drier is full of these little absorbing beads could these be sucked into my system since it was installed backwards or are they contained.
Hi Advanced level, I have a Chevrolet Sonic 2015 the the problem is that the high pressure pipe is cold and the low pressure pipe is warm and the A/C does not cool, what could be the problem? i have to recharge the system each month
Hello sir,
I owned a 2015 Nissan Altima S, there is problems with my ac, it is blowing mild cold, I went to the mechanic and he said, the problem is condenser and also he said he will try by cleaning the condenser if this doesn’t solve the problem then we have to change the condenser. Is it might be the case sir!?.
In this video what did you have your yellow line connected to?? How did it not loose pressure from the yellow line?
Can u do an orifice removal for a 2003 Chevy Impala 3.4 I’ve searched for hours and no help anywhere.
My ac gets cold only on low fan speed it cycles at 40* but if i turn the fan speed to high it rises to 60* and stops cycling. And if its at 40* low fan speed and i turn it to high it dont hold the temp at 40* . What do you think
Hello Eric been having issues with my ac on a 2008 f150. It comes and goes compressor won't come on? Took it to a shop they replace pressure switch and recharge but nothing just told me need to take it to a dealer have them reprogram the whole system. Funny thing it started working there for awhile for like a month or so but now it not working again compressor won't kick on
My Ac was working fine and then I switched it to defog the front glass and then it stopped cooling when I switched it back, it’s set to recirculate, the AC is on but no cold air is coming out, just room temperature air, I checked in the hood and the Low pressure line is room temperature and then I check the High Pressure line and it’s hot and then I saw there is some kid of splitter at the High Pressure line with a smaller line and that one was cold, I turned the car on and off a few times and did the same to the AC and it started to get cold again and the Low Pressure line got cold and it was working fine for like 20 mins then all of a sudden, I heard some hissing in the cabin and then no more AC, can you help me understand why that is, if possible please 😢
yes i have seen another video where it showed if the lines were not cold around the low side around the drier but check the line at the bottom of condenser and if it's cold there then the condenser is clogged. I don't get any cold lines anywhere but a shop told me they thought i had a clogged condenser. But when i took the orifice tube out of the line going into the evaporator it was cover in black gunk and oil. So wouldn't be more likely that the evaporator is clogged instead of condenser. Or maybe will it work just by changing the orifice tube which i have but haven't tried to charge it yet.
Only thing about what he said unless my understanding is wrong. The refrigerant enters the compressor as a gas and is compressed as a gas and still leaves the compressor as a gas, that gas is now under high pressure. The High pressure gas enters the condenser and its the fans pulling the heat out of the this said gas that turns it back into a liquid yet still under high pressure as it flows to the Expansion or Orifice tube etc. You can't compress a liquid. The high pressure gas is pushing against the liquid.
Thank you
This is the mistake that just about every mechanic makes, they diagnosed the vehicle and then they say it needs a compressor so they put a compressor in without replacing the dryer and the condenser and cleaning all the lines. It is such a backwards half ass way of fixing an AC system. Anytime you change the compressor you will notice that there is a lot of debris inside of it and where do you think that debris is going it's running through your condenser and all your lines including your evaporator and that's why whenever a vehicle needs a compressor it's guaranteed it needs all those other parts also and or have them flushed, ideally you can never flush a condenser because the fins or the ports inside are so small that you would just be wasting your time. A new condenser is always the way to go and always replace the orifice
All it was doing In the condensor was rapidly expanding like the orifice tube or expansion valve do
Wish I had ac in my Honda Odyssey
But I can’t afford to fix it. Losers never have anything good
I was just told I have a clogged ac and he said there is no way to know where its coming from. He said he would start by changing the h valve but no guarantee it's the problem.
Oh my God, the orofice tube is basically just a jet. I get it now. 😮
Is it possible to put too much psi through the condenser when blowing out flush ? I think I have one that is stopped up its new but I had some issues after charging so I flushed the system and it acts like it might have a blockage now.
The last part of the crushed condenser was acting like an orifice tube. Lol then you said that after I posted this comment.
So the compressor stopped completely because the condenser is clogged?
Liquid does not come out of the compressor, it is actually high pressure, high temperature gas, it is the condenser that turns it into a liquid.
Good video bro. Im having problems at the moment,and you gave me good info.
But isn't the line coming out of the condenser *supposed* to be cold? Doesn't the condenser *release* the heat? So the discharge should be cooler, no?
Good information keep up the great informational videos...
Hi my ac high line blasting , I thing extension valve is stuck. If I replace its it can stop or I must change ac line tho
Hey Willis, need to review ur report, can't compress liquid, it turns into a low pressure gas
anyone know why refrigerant gas passes through the ac vents? broken evap?
What if both of my lines are not hot or cold? I have freon and the compressor works but no cold air
I gave up on my ac a long time ago. Kept having untraceable blockage and leakage.
Did u have to replace the compressor again or just the condenser?
Yes thanks so much . Can you do a more videos on the think diag
So what do i do? When it realeases the pressure? So I be worried
Thanks for sharing your knowledge.
How did you fix it and make it stop blowing it's doing that in my town car
Man I tryed charging my ac with easy freeze can and it did this do you think there is a clog ?
Bingo , you win the lucky prize , I've been racking my brain on this 2000 jeep cherokee , I got the same curbing dent in it , maybe a short pole. Whatever , but the ac gauges are acting weird, my high pressure lines were cold , low pressure was warm ..that's what it is , condenser..I'll find out after I replace it ..thank
Update , i replaced mine , something is still plugged , my ac pump is new it dont blow off like this one , im wondering if my evaporator is plugged ..or full of white long dog hair , but i got air and vent pressure .
If its clogged , does compressor still working ?
do you think the original comp let some guts out and did the clog maybe stop leak? i didnt think it was that bend....by the way great tip
Great explanation, sir! Yet another super video.
Hot gas comes out of the discharge side of the compressor, not liquid. It becomes a liquid after it has been cooled down in the condenser fins. Bottom of the condenser is where the freon becomes (hot ) liquid.
I was just being general in my explanation. Its easier for regular people to understand it that way. This understanding is enough to help someone diagnose their problem. Thanks for watching!