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@ReptoOwnsYou

3 жыл бұрын

Looks like you know your stuff. I got a problem with my AC, I pulled vacuum for 1hr and it dropped a few psi (2-3) after 10min. If I press the AC button ON the clutch kicks in after I pulled vacuum... isn't that not supposed to happen? So I charge low side and the pressure shoots up way high 100-120psi and the high side goes to like 50-100psi and system won't take anymore (full) no cold air. Ik its a lot but thanks.

@ReptoOwnsYou

3 жыл бұрын

Also the AC clutch stays engaged without any charge

@JDECHANEY1

Ай бұрын

3:14

Fantastic video and explanation. I just bought a set of gauges for my the a/c in my kenworth t680. I need to learn how to top off the freon when it's low. Several years ago,i overcharged a system on a different truck with those little bottles you get off the shelf in Wally world. 😂 don't want to make that expensive mistake again

@franshuber910

5 ай бұрын

It's not a good instructional video actually. So if u want to avoid more expensive damage. Don't do what he did! Lol.. (I do this for a job)

I've had a set of gauges and cans of freon for 25 years and never knew how to use it. Thanks for the great demonstration!

@insanelywicked873

Жыл бұрын

Don't use 25 year old refrigerant lol

@1marcelfilms

4 ай бұрын

sell that r12 for a pretty penny or use it in older cars

Loving the detailed information in this video.....first time watching and I subscried 👌🏾......now I need to look at your other videos so I can learn to charge the system properly

Thank you for teaching us a lot of knowledge

Great video, great explanation very professional. I learned something new thanks to you....definitely I had to subscribe.

Thank you for the info Sir, Your right to the point and very easy to understand yOUrOCK !!!

Thank you for the educational video, mine is working fine on my Volvo truck however since summer is already here I would like to do in the AC check and make sure everything is the way supposed to be so again thank you.👋👍✌️

Explain really well ! Being a student in diesel a mechanic school, I understand way better your explanation than those of the teacher... Big thumbs up !!!

Great DIY Lesson and refresher coarse, for me! Thanks

Great job. Keep showing videos

Wow I'm having problem with my AC too I just changed my fan clutch I don't know what the problem is but I'll check it tomorrow thanks for your show

Great job on explaining everything.

@DIYSEMI

4 жыл бұрын

Thanks!

Thanks for your helpful videos

Excellent video. Thanks

I did my reciever dryer and both expansion valves after this video

@merives2263

10 ай бұрын

I have a question. My ac starts off cold, an hour after I drive it gets warm. When I stop to idle it gets cold again. I've replaced both expansion valves and the drier. Can it be the evaporator?

This a very complete info thank you. Javier from Odessa to

Great work 👍👍

Thank you. You did a great job.

Thank you for all the things you taught me!

Good demonstration and info. I watched in full.

@DIYSEMI

4 жыл бұрын

Much appreciated

@LauraBruno33

4 жыл бұрын

@@DIYSEMI Your welcome

Holy sh!t, im currently enrolled in UTI (trade school) for auto tech, and you did a great job at explaining this! Honestly can’t believe I had to look on KZread to understand AC diagnosis smh Really think you could be an instructor if you’re not one already

@franshuber910

5 ай бұрын

Mate!.. lol. It's totally incomplete and done wrong! 😂

I like it., this is well explained

Thanks a lot for your help and time

Great video!

I appreciate the demo

Decent video. Ty!!

I certainly appreciate you taking the time to make this video. I have a Freightliner chassis motorhome and, have had quite of bit of trouble with the dash A/C on this coach. I've paid several times, to have the system checked out, vacuumed and charged. Each time, they say it's ready for service. Each time, it works for a day and that's it, it's warm again. I recently purchased a Harbor Freight set of A/C gauges and, a vacuum pump. I vacuumed the system down to a max of 26 inches and it won't hold for a long time. I will hold for say, around 15-20 minutes. So, I'm presuming there's a leak someplace. But, I've charged this system and it will produce as low as 40 degree air from the ducts, while driving in around 80-90 outside temps. As the temps approach 100 degrees, the air from the ducts increases in temp to around 50-60 degrees. But, as stated earlier, it will loose that charge. It's very difficult to find a leak on this type of chassis. But, in any case, you have enlightened me quite a bit on some basics and technicalities of A/C operation. I will look forward to finding other vids of yours and, ones to come. Very much appreciated. Scott

@lucytristan-oz1sw

Жыл бұрын

A REAL HARD LEAK TO FIND IS WHEN YOUR EVAPERATOR IS LEAKING IT WILL HOLD A PRESSURE TEST AFTER A VACUUM HAS BEEN PERFORMED AND WILL LEAK THROUGH YOUR EVAPERATOR DRAIN WHEN YOU RUN THE AC UNIT AFTER 5 MINUTES OR LONGER I DIAGNOSED A CAR WITH THAT PROBLEM HAVE A NICE DAY ASE TECH AND BEHOND

@franshuber910

5 ай бұрын

U do have a leak. Yr sytem failed the vacuum test.. it should hold 29 hg indefinitely. Next step would be yo pressurerize it with nitrogen and soapy bubble spray to 'hopefully' find the leak. If that fails. Next step is to recharge it with ac dye added. This dye goes round the system and exits at the leak site. After having it ran dry, darken out the vehicle bay and shine an ultra violet light on all the hose and connections and components. When you see a green dye trace, you found the leak.. this is the most successful leak finding method in the arsenal and every ac specialist should have it on offer. And this is what u need to do to actually solve the problem.. we do this successfully everyday..

@scottraines7419

5 ай бұрын

@@franshuber910 I certainly want to thank you for responding to my issue. It was by pure luck that while I was checking out the engine for an upcoming trip, I noticed some wetness on the corrigated plastic cover that covers each of the A/C hoses that come from the pump. One was wet about a foot or so from the fitting on the pump. Hmmmm. So, I peeled back the plastic cover and what I found was what looked like a potential repair with crimped fittings and all. It was fairly oily around all that part right there. I had to assume that was where my leak was and no one in the service center where I'd paid to have the system checked out , vacuumed and filled, bothered to look there. After determining that hose was the short one that led to the evaporator, I had a new one made up and installed it. I then vacuumed the system down to 29.5 inches and it held for as long as I wanted it to. I then filled the system with the required 40 ounces. All that was a couple or more months ago and each time I'd got into the coach and fired it up after I'd done that work, the A/C was cold and nice. So, I think I've fixed my problem. It's winter now here in Southern AZ so, I'll check it out when things warm up in the future. Again, thank you for responding here. Very much appreciated.

@esdrasjuarez3335

4 күн бұрын

I have a 2003 freightliner Columbia and my AC compressor when I’m going down the road sprays out all the Freon. I already changed the expansion valves. The AC dryer evaporator that condenser in the to high and low pressure sensors, put on you compressor and still doing the same thing.. and this is them is not over charge because it calls for 3.7 pounds

@esdrasjuarez3335

4 күн бұрын

Can you please help me with it thank you

Legit good video!!!

Appreciate the detailed video

very good video.

Very helpful, thx. What are the readings low and high side for to be inspect? You mentioned they are lower than I like but never gave a reading number for normal working condition.

My AC is reading about the exact same as yours on a 80 degree day.Like 22 on low side and 185 to 190 on high side and compressor is kicking on and off every 25 seconds.Pressure readings then are 45 low down to 150 on high side.Its cooling,but seems like it could be better.Is freon a little low.

Very informative.

thanks buddy keep thing boos

My ac doesn’t cool enough when idling but works fine while driving or at high idle. Gauge was reading low side at 50 and high at 175.

Good stuff

I just replaced my ac line, compressor to condenser. Ac was working before I spotted the leak. I believe I lost too much Freon because it is not cold now and the compressor does not kick on. Engine fan only turns on when engine is hot. We have the same truck, so I am curious when I add Freon which side to add it too, hi or low?

Thanks for the Vidoe What’s a normal cycle time ?

I have a quick question! my high side goes up to 300 , when the fan kicks on it drops down to about 100 and it stays between 100 and115 after that. My low side kicks clutch on at about 30 and and shouts of at about 50 and drops back down around 30 and then rapidly goes up to 50 and drops again Clutch keeps engaging and going off And sometimes the clutch gets stuck but I can hit it with a screwdriver and it starts can you help with this

Add refrigerant with the fan drive engaged. Switch on dash may have override , if not unplug fan drive air solenoid on firewall

Thank you DIY

❤❤❤❤❤😢😢😢😢 god bless you Sir.

Thank for you this ionformation.i want ask one question for you.i hope to you have good answer.yesterday i find one fault JCB machine A/C system.its not cooling properly.i checked its pressure its running time suction 30 psi and discharge 160 psi.after pressure balancing its coming 100 psi.conderser and cooler filters all ok.near the system filter area have slide glass .i can sea inside liquid passing properly.(It has one problem.its compressor switch off time system pressure balancing within 2 second) can you explain me what is the problem????thank you

Informative video!

Hi i have 2007 freightliner columbia installed new compressor and dryer and ac works perfectly and my engine fan constantly working when i parked and idling ... when i driving its not ac is not cooling any idea whats going on?

Thanks!

I put a new condenser and new compressor, vacuum and charged, work good for a week, now when truck idle ac blows warm but when driving down the road is cold, what do you think?

I have replaced in y 2004 Columbia AC condenser,AC COMPRESSOR,dryer ,expansion valve and evap core ….and my AC blows cold somewhat but it’s very hui side . Iam so puzzled what could it be ,any help will be much appreciated 🙏🏼

here is my problem i switched ac comp couple of week ago and my ac was working just yasterday i switched fan solinoid because my fan clutch wouldn’t come off, so now compressor isnt working too, it is betterly worm after 1 hour of engine working, i checked amperageon compressor electricity, there is non, could it be high pressure sensor that meses everything up? and my pressure on low and high side both 100 with engine on and off

One time I’m doing recharge of refrigerant 988H wheel loader i put only about 200psi on high side 15 psi low side but not good colling I put more about 280 psi high side and low side 35 become good colling but I’m worried if already high pressure or normal thank you

Hello I have a freightliner Cascadia has no cold air in front but has cold air in rear , I did replaced EXPANSIVE VALVE on the front side, recharge the freon , but it did not change anything , front still has no cold air, and rear has really cold air . Do you think the new EXPANSIVE VALVE is not working or maybe something else cause front AC NOT cooling at all？If you have time please let me know I appreciate ， thank you

I noticed you closed all the valves but only opened two of them. So to check pressure, I need to start with them all closed and only open the two at the ports and leave the ones at the gauges closed?

Hi! I might find a professional answer from you if you’re willing to share,because out there,rarely theres a technician that knows what is doing.Well long story short,my AC clutch compressor went out the other day(Century class series 60 Detroit sleeper).Changed compressor dryer vacuum the sys charged back (at a Speedco) and barely get any cool air from vents.Got home bought these gauges and i get 45psi on low and 310 at high engine running at 105-110 ambient(Arizona temps).Fan engages, compressor clutch as well engages but compressor never disengages while running.At idling it blows warm air barely any cool air.Before compressor failed,it had pretty good cold air out of vents.What could be at fault? Expansion valve was changed also not too long ago,i also add a bit of freon and bump the low at around 52psi.Also the sight glass at air dryer its white foamy if that helps.Thank you much!

Just subbed, almost to 10K subs!!!

@DIYSEMI

3 жыл бұрын

Thanks for the sub!

@AMPMChatt-Jax

3 жыл бұрын

Sub to AM PM Mobile Repair for Owner Ops tips and tricks

What are thr numbers the gauges are supposed to be reading when operating regular

Subscribed

@DIYSEMI

Жыл бұрын

cool

I have a new ac compressor, new dryer, a new blower motor, and a new resistor. My truck blows good and cold for several hours, then it acts like there is a clog and the air flow is restricted and barely blows. I have a 2016 Prostar. Any help is appreciated.

@DIYSEMI

3 жыл бұрын

Possible that the evaporator is freezing up? Does it drop water out under the truck like a/c normally does? Did u look at that discharge temp sensor inside the dash? Just a thought

I have a situation whit my ac pomp compressor, is releasing freon out on valve safety pressure, that happens sometimes at heat position, what do you think could be?? I really appreciate you opinions, Thanks

@DIYSEMI

2 жыл бұрын

Sounds like you have super high pressure. It's probably happening with heat on because compressor turns when defrosters are on. You probably have a bad obstruction somewhere in the system building back pressure.....I would have it looked at.

I don't meant to bog you down with the following. I just though I'd ask. I have got any idea what I'm up agaisnt. The shop i had install the ac compressor can get the vent temp any lower than 63 degrees. The sleeper ac/heater doesn't even have a sleeper filter. Shop says they gotta take out the whole unit to clean the condenser; jeez wiz. I have a 1999 KW T2000. AC hasn't worked in 10 years since I've owned it. Ac compressor blew the clutch. It's got a new compressor now. It has an "Automatic Temperature control knob" on it. The hot water heater hose runs to the cab for heater & I've heard it somehow runs threw the ac as well. Supposedly the "Automatic Temperature Control Knob" adjusted is suppose to somehow control the ac & heater by turning it right or left. In order to avoid hot water running, somehow, threw the ac, I had shut off valves put in to the hot water lines to cut hot water going to the cab & ac. This Automatic Temperature Control Kbob as is written on the on the plaquered.

2016 T680 isx15. Im in AZ and outside temp on dash reads 124°. With ac on, fan stays on. With ac off, fan will turn off. Ac is blowing cold at idle and while moving. Once im going down the hwy with ac on and fan is on i can turn ac off and the fan will go off. It will stay off until i start to come to a stop even when i tirn the ac back on. Then the fan kicks on and stays on again. No ac codes present. Im tempted to thing its a high pressure switch but what throws me off is when im rolling i can turn ac off and fan will go off but it will stay off, if im rolling.

@DIYSEMI

11 ай бұрын

possible high pressure, but it could be due to that extreme heat. is it happening when it's not quite that hot out? Gosh dang that's hot. I would melt

@simplespeed84

11 ай бұрын

@@DIYSEMI So last night when it cooled down a little bit the fan started cycling normally again at idle. It guess its from the heat. Its so dang hot lol.

Any idea why my international is blowing warm air on idle?

On a 2019 peterbilt 579 at random times when shut engine off for 5 min guard shack check in, after starting up again compressor clutch won't engage. Is this because system under to much pressure? The strange thing is it only does this at random not all the time under same type of operating conditions. My quick fix is drain air pressure in air tank to engage fan,pour bottle water on lines to compressor and after 5 min compressor comes back to life.

@DIYSEMI

Жыл бұрын

Yes, sounds like a high pressure situation to me. Could be several causes. Overcharge system, restriction in system...etc

Thank u will repost it to truckers

thanks for youre information, can you maked or made how to charge freon?

@DIYSEMI

2 жыл бұрын

i can only show so much because some parts of it are illegal to do by yourself without a license

Whats the regular temperature coming out from the vents? I just got my ac replace and dryer but i dont feel the air real cold. I used a digital thermometer on da vents and blows 64 degree. Should it be colder like in cars because in my car shows 45 degree coming out from the vents. Today temperature is 88. Need some advices

@DIYSEMI

4 жыл бұрын

Yes, if everything just got fixed i woudnexpect it to be 40-50 degrees from the vents.

@DIYSEMI

4 жыл бұрын

I show how to deal it in my blower motor video. At the end

If you have water in the condenser from cleaning it. it can cause a super cooling effect and it can seem your pressure is low but it’s not. It’s happened to me

Thanks.

I’m having trouble with my ac on my peterbilt 365 2014 , the high pressure shows around 300

@omartrejo4219

3 жыл бұрын

The compressor broke down, so I replace it and the dryer too , and after that my engine fan it’s kicking in constantly after stops running kicks in right away, and the ac isn’t cold no more

Thak you I Gotsom know how

Awesome video sir. Can you please explain what could be an issue when you have high pressure on low side and low pressure on high side, but they are equal? You explain that high pressure on low side,and low pressure on high side could be expansion valve, but will they be equal as well, cuz mine are, and I also have codes for high pressure shut off valve, and cab interior temperature sensor, which I both replaced, and still nothing.

@DIYSEMI

3 жыл бұрын

Yes, they can be equal

@DIYSEMI

3 жыл бұрын

Yes it can be expansion valve

@Brka1108

3 жыл бұрын

@@DIYSEMI Thank you so much sir, I will try that :)

How many Freon cans should I use for a 2006 kenworth day cab ? Thank you

@DIYSEMI

2 жыл бұрын

should be a sticker on the firewall that will tell you

What if your compressor stays running and does not kick out?

So I have a question I have an 07W9 I just change the AC compressor both expansion valves the dryer the condenser I pulled a vacuum it held a vacuum I charged it with cans the temperature was 70 the low pressure side we’re staying right around 20to 42 pounds, The high side was going up to approximately 325 the fan kick on and pull it back down that seemed kind a high for that cool of a day any answers

@joearnone8138

3 жыл бұрын

W900 Kenworth

@DIYSEMI

3 жыл бұрын

does the a/c cool as it should with no issues? My first thought would be were you careful to add the exact amount of refrigerant to the system? an overcharge can cause this. couple other things, do the pressures equalize when you shut off the truck? are you warming up the truck before testing pressures? temp is important as well as airflow. does the fan bring the pressure down quickly or does it struggle? I would run the truck for a good while..see if you get different readings with everything up to temp.

@joearnone8138

3 жыл бұрын

@@DIYSEMI yes the pressures does equalize when I shut the truck down and also with the fan kicks on it does pull the Pressure down quickly, I had to leave out today so it’s doing great with the AC set on outside air vent , on my little thermometer I have stuck in the vent is showing 40° fan is on two speed, so it’s doing great I won’t be able to check with the gauges until I get back home. Thanks for your response and your video looking for more stay safe.👍🇺🇸

Where can I get the temperature chart for the high and low pressure for the AC ? And how agred is it

@DIYSEMI

2 ай бұрын

can find them online, or they usually come with a manifold kit.

My high pressure goes up to 300 psi initially and when the fan comes on it drops below 100 and never goes back up. Could that be an expansion valve malfunction.?

@DIYSEMI

3 жыл бұрын

Can I ask what kind of problems are you having? Does the a/c not work? does the compressor run as it should? or when the pressure drops and does not come back up, is the compressor not kicking in? It can be multiple thing causing problems like this

@dwaynemonts652

2 жыл бұрын

Good explanation didnt no how to use my set the right way

It was a long time ago as soon as i saw your video i subscribed your channel. I have question i have volvo vnl 670 2011 and from passenger side where is ac evaporator i hear hissing noise the whole time when ac is on, if i turn of the ac the hissing goes away. No cold air. Can be a bad evaporator cause i as i’m touching the evaporator around the hissing changes the sound. Please help. thank you and keep doing your great videos.

@DIYSEMI

2 жыл бұрын

That is possible. Also while u are in there check your blend door actuator

@One.Six92

Жыл бұрын

Some ac systems will make hissing noises when they are low on refrigerant. It's the sound of gasses moving through the pipes rather than a liquid.

when engine is off and u measure static pressure ..it is kind of important the reading. yours correlated nicely with ambient temperature. if it reads 30...and u have 90 degrees outside ....then something aint right

How much uv dye do I need to put in the system to see a leak? I’m trying to find a leak and I put in 4 oz of dye but I don’t see the dye leaking out or anywhere

@DIYSEMI

Жыл бұрын

4 oz is way more than enuf. Did u look at the evaporator inside your dash for leaks? And in the bunk?

@918sonicsupra

Жыл бұрын

@@DIYSEMI I looked under the bunk at that evaporator there but I have not looked closely at the evaporator in the front.

👍👍👍

I just replaced my compressor on the same truck I flushed and vac the system down and charged it but now my compressor will not kick in is there anything I can check to find my problem

@DIYSEMI

3 жыл бұрын

did you check to see if you have power to the compressor? probe the plug. look for a 12v reference

@TheBreedxxx

3 жыл бұрын

@@DIYSEMI yes and there’s no power so I checked the compressor clutch jumped it and it works and blows cold I’m thinking it the high or low pressure sensors

@DIYSEMI

3 жыл бұрын

@@TheBreedxxx very well could be

I have no refrigerant in the air condition system. Where to start from to diagnose the problem

@DIYSEMI

Жыл бұрын

Put a can in with some dye to find your leak

@user-po8vo6zt7x

Жыл бұрын

@@DIYSEMI thanks for the information

Great video,which port does the freon go in?

@DIYSEMI

Жыл бұрын

low pressure side

@danielnargiso2614

Жыл бұрын

@@DIYSEMI I got same truck you have ,is it the side with the blue gauge connected to it?

Adam, would a 3cfm 2 stage vacuum pump at Harbor Freight do the job?

@DIYSEMI

2 жыл бұрын

Yeah. Even a small one....just takes longer

@manvsroad7691

2 жыл бұрын

@@DIYSEMI Ok, thank you. Going to attempt this tomorrow. How much or how many cans of refrigerant?

@DIYSEMI

2 жыл бұрын

Should be a sticker on your firewall saying how many ounces

which could cause the fan to turn on and off very often

So the low pressure line is the smaller lane and high Pressure is the biggest line?

@DIYSEMI

3 жыл бұрын

The bigger fitting is high pressure. Smaller fitting is low. You can only hook up one way.

@JOSH-bx5wp

3 жыл бұрын

@@DIYSEMI right on man. Thanks, I guess when I replaced my high pressure switch I put it on the lower line

How much Freon does the truck take if I had to recharge it?

@DIYSEMI

Жыл бұрын

Depends on the truck. There should be a sticker on your firewall that says how much

I'm not even sure if you're still on KZread I know this is an old episode but I'm trying to figure out what's going on here I watched your video here on manifold gauges I did exactly how you had explained and I thought I was doing something wrong so I watched the video as I did it by no means am I saying that you're doing something wrong however the low side of my gauge is only showing pressure while adding freon when the can gets emptied the low side gauge goes to 0 and so on once I have the 3.5 lb of freon in the low side of the gauge is 0 but the high side reads correctly at 225 to 250 can anybody tell me what's going on with this thing never happened like this before so I'm kind of confused on what the world's going on I appreciate anybody's help thanks

When i turn off the a/c my low stay in 60 and high side in 100

where can i find this tools, Manifold gauges

@DIYSEMI

2 жыл бұрын

Any auto parts store..,harbor freight too

👋👋👋

Dude its getting so hot

It is not relevant in your set up with the adaptors on the Hoses BUT you Hoses are on wrong. If you take them off and look at the ends, The bent end will have a core depressor in it, the straight end will not. The reason the adaptors turn in the opposite direction is because it is not actually a Valve. the Knobs turn in the pins to depress the cores on the Truck connector.. Mike M.

I have: low side 350( it says retard) high side 175. I never saw that, what's mean?. Compressor clutch engage, fans working.

@DIYSEMI

3 жыл бұрын

sounds like a restriction somewhere

Why you tape the company name up?

@DIYSEMI

Жыл бұрын

Because people on the internet can't behave themselves

Its low of freon

It's undercharged! Low.presuure should be about 30. Yrs sucks down to 10. Way to low. That truck probably needs a kilo of refrigerant! U probably put in less than goes into a small car. Modern cars take about 450 grams. Big suvs .with dual ax about 800. Trucks like yre 1 kg to 1. 6. To do it properly u find put how.much refrigerant yr vehicle needs exactly. And then use a scale to measure the exact amount. Also when u regass add some lubricant!!! 30-50 cc of PAC oil..

Get yourself some dry ice and a strong fan 🪭

Thanks!!!