Air Conditioning Diagnosis. Iced up expansion valve due to moisture in system
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- Опубликовано: 27 июн 2012
- Amazon has a set of gauges and a pump to do it right HERE→www.amazon.com/gp/product/B001...
They also have a cheap and dirty pump HERE→www.amazon.com/gp/product/B001...
Air Conditioning Diagnosis. Iced up expansion valve due to moisture in system 
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I love how you break things down and go through the diagnosis for us it really makes a world of difference thanks
Best AC condition diagnosis and explanation I've seen yet!
Thanks!
Dude, blowing air at your hand, that is the best way to explain how a/c work. You are so smart and nice.
Awesome explanation . After 30 years in automotive field , simple audio/visual explanation of what an expansion valve does in a way I will never forget . Thanks & keep up to good work
Best description of the high pressure and low pressure I've heard yet! This is helping me diagnose my issue!
thank you for all the video's i go to school for 7 hours a day and sometimes just cant understand the 360 loop around things hop on your channel very well explained thanks for your time!
Well I'd be honored to be your friend. I just turned 51 and I can tell you in all my years I've met very few guys of your character and skill. Working on cars has only been a hobby for me so when I see your work I'm in awe. Learning how to repair cars involves a lot of trial and error and since I've rarely done the same repair on the same car twice it's been a whole lot of error. I did put seven axles in my 70 datsun roadster because the first 6 from scrap yards were bent so I got good at that.
I flattered. I've also been through a lot in life thus far too. Thanks.
This man knows his stuff. I've watched alot of his videos. Brian I'm feeding off your brain!
Excellent job!! I am not a tech but learned over the years that cleaning the condenser is 90% of an AC maintenance job. Also maintaining a quality belt on the engine permits the accessories to function properly--which of course includes the AC compressor. My current problem is trying to figure out a way to clean the condenser on my sister in laws 1997 Taurus. Ford has made access to the condenser and radiator (either side) on this car practically impossible.
You explain it in such an intelligent way making it easy to understand something so complicated. I'm prepping for the HVAC ASE test and that test is high level diagnosing
Thank You
..and fast approaching "that" time of year again-
Great vid!
Thanks
Thank you for that simple explanation of the AC system. Now I understand why every part has the name that it does.
You explain it in such an intelligent way making it easy to understand something so complicated. I'm prepping for the HVAC ASE test and that test to me, is high level diagnosing, I failed it once so back to learning.
Thank You
I admire your knowledge AND your pic!
I have watched several of your videos and find them to be helpful. Thanks
I had no reason to watch this but you explain things so well I thought I might as well learn something
Hey Brian good clip helpful info, really appreciate it . I must mention too that I liked the example you made with YOUR MOUTH, VERY convincing
Another great video Brian. Well explained, thanks.
I usually explain it to the customer this way: When the pressurized refrigerant is pushed through the small orfice, the heat is left behind on the pressurized side. It is then dissipated by blowing cooler air through it. Basically you are removing heat from inside the car and leaving it outside, the a/c is a heat exchanger.
Good video.
Thank you for sharing your a/c knowledge. I had the exact same thing happen on a Jeep I owned years back.
Thanks for the good explanation there Brian! Now I understand how AC is recirculated in a more logical way. Thanks Again...
Marc
brian your analogies or just freakn phenomenal👏👏👏
excellent explanation of the a/c system Brian! i swear you should have your own t.v. show. Always impressed by your knowledge. cool Waterton Lakes shirt.
holy crap iv been waiting for a video about the a/c and u just explain it so well which is a plus unlike all these other videos iv wasted my time on
BRIAN, EXCELLENT DIAGNOSIS, EXCELLENT VIDEO THANKS FOR SHARING!!!
Thank you! I remember the lesson, but couldn't remember exactly why.
Thanks for all the info. Explained it very well. A friend told me I needed to replace th expansion valve in my 2004 galant but when I go to look for one online and in the store they look similar to but not exactly the same as my friend pulled out. I figure I just need to go to the dealer and get the part there. I know they said it's about 80 bucks there. We evacuated the system and charged with some refrigerant using a machine he has. Works fine for about a day then goes hot again.
He checked for leaks in he lines and didn't see any but he mentioned maybe I needed to replace the nozzles or whatever u call them. I don't know. Just hope to fix it before summer.
hey love the refrigerant shuttle bus explanation, I may have to borrow that one!
thank you, love how u break it down in explain it.. i understand a lot better.. thank you
That was funny when explaining pressure drop and you said something but it wasnt making textbook sense, and then you say Thats just the way it is, lol classic
thanks man love your videos
It may be worth a try. I generally don't use the treatments. I'd try synthetic on the next oil change like a 0W30. My philosophy is to fix the problem. If an engine is dirty- clean it. If it's worn out- rebuild or replace it.
great video and love the Ron Paul TRUTH picture in the back. I want it!
Yes. The fittings are also a distinct indicator
Great explanation Brian, Thanks.
Thank you very much! Having an issue with low side low and barely cool air. When I'm idling the low side pressure remains, but when I start driving it eventually becomes warm and low side pressure becomes very low. Low side lines are condensation and tons of water dripping from the evap drain tube. Definitely freezing going on. I'm trying to figure out whether it's a stuck expansion valve or if there's moisture within the system. Low side was within range, but on the low end when idling before taking a drive. It was definitely opened before and I have all the reasons to believe it was neglected so they may not have vacuumed the system of moisture. Will rent gauges and vacuum pump and report back to get a real idea. Might just evacuate, vacuum, and recharge and see if I can get away with that since I'm not savvy enough to differentiate between the possible issues. Thanks again! Your video was very helpful.
Great video and an excellent diagnosis.
Hello Brian, what made you decide to not replace the expansion valve and just add a little freeon after evacuating the system.
Great video....You explain very well...I subbed....Thanks for your knowledge!!!
Thanks Brian. great explanation..
Great vid and Love the Ron Paul poster. ;)
great vid on ac...ty for posting...you do great work
Cool video as always,great explanation.
Kudos for the excellent explanation, Brian. I think EricTheCarGuy turned me on to your channel, and you seem to have the right stuff as far as cars goes. Keep it up!
very good and down to earth explanation, thanks
Nice video and explanation,. So when you restrict turning screw clockwise on the expansion valve in cabin blows more cold? Because I opened unclockwise, let the heat in faster to cool down the a/c pump fasters but now doesn't come out cold cold in cabin.
Excellent explanation. My 2015 Mustang is having A/C cooling problems and my dealer is replacing the expansion valve today. A new compressor and collector did not solve the issue. Hope this does the trick.
Awesome video. Thanks man. I do have a question. I have a vacuum pump that I use for pulling vacuum on residential air conditioning units. Do you know if there is an adapter to use that same pump to pull vacuum on the cars ac?
Thanks
here's one for you. Nice video btw. I just replaced condenser, receiver drier, and expansion valve. pulled a vacuum for an hour and a half and charged it. It got nice and cold, worked great till I turned it of and the compressor started to cycle on and off at idle. cools down while I run it on the freeway or a long stretch of street. But on stop and go traffic, it gets hot. I replaced the condenser because it was in bad shape and was painted from overspray and the reason that started this whole a/c problem. went on and changed the expansion valve. Still have the same problem. Maybe you can shed some light. 2000 camry v6.
Thanks...from Philippines.
Thanks!
Awesome! I just experienced this same situation!
It depends on the car and LARGELY on what type of ignition system it has. Generally you don't want water sprayed at pressure into a spark plug boot well. Nor do you want to spray a distributor cap. Also the insulation under the hood should be left dry too. If it gets heavy it will sag and tear. MOST everything else can be pressure washed. The engine compartment is made to take a splash.
I love a/c work. Nice video....
It's tough to pull moisture out of a dryer because of those saddle bag silica gel things. The silica gel really holds onto the moisture and therefore loses capacity to hold more water. Though it's not ideal. They can be re used with success.
Hey Brian how would you know or there is a way to tell if there is moisture in the AC system? I just bought a use car and the ac coming from the vent is at 60 it will not get colder then that unless I get on the highway and it will go down to 57. Thanks!!
Hey, can you please tell me what adapter size you used, or share a link I have the same pump trying to modify for car ac work
Really good video thanks for the info
It sounds like either that or possible accumulation of moisture or overcharging.
Hey man I had replace my compressor so my a.c. started working for about a month or 2 then out of nowhere it stop....my line is not cold n the high line is hot.....n my compressor clutch isn't turning ....my question is can the expansion value not working can cause my compressor clutch not to turn?? I check fuses everything is good..
Thank you. Good video.
Refrigerant can carry or suspend only so much oil. The manufacturer will specify the amount of oil, but it's roughly a given percentage of the refrigerant by weight. Most systems that are 1kg charge with have 6-7 oz of oil. A big system like on a van or Suburban with have close to 12 oz of oil and a 2kg charge.
Hey Brian would you suggest using Rislone engine treatment on a Jeep 4.0 inline engine ? I got a little ticking noise from the engine..
2000 Jeep Gr Cherokee 150,000 miles thank
Awesome video as usual Brian. I love A/C in all forms so any video about air conditioning is great! Also, I'm curious, do you have an air conditioner for the shop?
Great job on the video. Thanks for taking the time to shoot it. You should consider teaching too.
I love teaching, you just can't support a family and my hobbies doing it without giving up the time to one, the other, or both.
I like this video he explain everything thanks for showing this video.
Great job!
Thanks for the vid Brian, my A/C has been out for quite some time now but it hasn't started bothering me until just recently that it's gotten hot. I will use this to troubleshoot my system. Quick newb question though, is the little oil-filter-looking tank on the left with the lines coming out of it the expansion valve or what?
great explanation
If the level of charge is off it will build too much pressure too quick on the high side and cut off or it will run out of pressure on the low side from being too low and cut off to preserve the compressor from not getting lube (suspended in the refrigerant charge).
On my RV, I replaced the expansion valve and drier. Ran a 3 CFM vacuum for 2 hrs. Charged the system with refrigerant and my expansion valve looks like a block of ice. My AC line does get cool but I get negative low pressure on the low side gauge. I’m in a vacuum with the engine running and AC on max. I don’t know what else to do?
big help thanks learned alot
Hi! Can i just ask, do you have to fully wrap the expansion valve?
Hey Brian, Is there some kind of valve in the a/c system that releases refrigerant if the a/c system is over charged? I noticed one day i accelerated and I heard this sound like air being released then I smelled freon.
great video thanks
thank you. also what was the amount of coolent I should add? I think its 1.5 pounds and also how much oil should I put in it?
I have a 09 Honda fit. when I put on the defrost or AC, I hear a hissing noise under glovebox. then when u shut the car off, the compressor pulley squeaks. the hiss noise seems like its coming from compressor. the clutch engages, but AC wasn't very cold last summer. if I switch to heat, or floor the noise goes away. I don't know what to check next.
I haven't. I know brake parts cleaner work phenomenal though.
My 2003 Maxima AC both high and low sides have the same pressure around 90psi even though the compressor is engaged and running. Could be it be the compressor is dead or the TXV is stuck wide open?
Looks like an accumulator I see there if I'm not mistaken. If that is the case, then this system doesn't have an expansion valve, but rather has an orifice tube instead. Just an observation.
Technically speaking the orifice tube is an expansion valve. It just won't adjust itself to anything
Welcome!
thanks for this information brian. very informative. as a tech i am always looking for relative information and personal perspective on subject matter. being that i live in texas i know a thing or two about a/c systems. as / chrysler diag.... if you have low pressure on the high side and high pressure on the low side, before changing the compressor it is wise to dump a cold bottle of water on the expansion valve, ice cold. this got me thinkin... in the colder months, why don't i put my system under a vacuum? this make keep any moisture away from vital components on my old ragged vehicle which i know could use a new compressor? i guess that time is coming but i would like to put it off... sorry for the mental adventure... best of luck my friend and good job again!
Have you tried condenser cleaner form a residential HVAC store for cleaning automotive condensers?
Thank you. I learned a lot
Welcome Jesse!
Your'e welcome!
my saturn has a pressure safety blow off valve. its on the compressor alldata said it triggers at 500psi ( which is crazy high) and will close at 400. it also said it it ever opens it needs to be replaced. im not sure if there is way to post it.
Hey Brian, was curious to know if you could explain something a little further, as I'm studying A/C to take the A-7 HVAC test. Anyhow, the expansion valve, is it not flooding the evaporator? The fixed-orifice-tube system, as my understanding, is a flooded system, meaning after the orifice and in the evap base is liquid, low pressure/low temp liquid, right? As for the TXV system, does the refrigerant actually turn into a vapor at the TXV? which is a variable port determined by evap outlet temp... or is it still a liquid like the FOT system? I understand the high pressure/cool liquid mistifying at the metering valve, turning to low pressure/cold liquid after. But, does the TXV system actually VAPORIZE the refrigerant at the TXV valve? Cause I would think it would think it still needs to cold liquid in the base of the evaporator for the heat exchange? If I'm understanding correctly? Lol, I know, getting all scientific about the physics of it, but like I said, I want to knoweverything about A/C for the test.
Thanks man! So how long did you vacuum it down and hold it?
Thanks
What would happen if you vacuum it down and left the gauges open then charge it would it cause the same problem or would the drier get whats left
Yes!!! Your a Ron Paul fan!!!
youve got a way with words,when i done my a/c course the bloke dident want to explain anything,i swear he wanted me to fail the exam:/Anyway on vauxhall ,opels suffer with condensers that fall appart!personally i would try and stay away from bodyshop repairs as ive had them put new condensers on with no seals!cheers man
so was it the condensor or low on freon or a pre mature diagnosis
Not sure what you mean by that. What do you mean?
what is a C Connection. i was not sure what it does. i have a friend that said his A/C failed bc it was leaking.
i had my a/c temp sensor replaced located behind the dash since then the a/c stops around 93 degrese but only did it once since it got replaced.
Yes there is. Sanden compressors have a pressure relief valve, and it pops when the system is overcharged to protect the seals.
awesome!
I don't use a water hose under the hood for any reason other then what Brian did in this video. if you feel the need to clean under the hood use a rag and spray the cleaner on the rag. This way you wont have any problems getting anything to wet.
What kind of AC recovery machine is that? I need to buy one
Good man