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GMC TRUCK A/C RANDOMLY STOPS WORKING DIAGNOSIS & FIX

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In today's video we take a look at a 2005 GMC Sierra pickup truck with a 5.3l V8 engine. The customers complaint is that the Air conditioning intermittently blows hot air. Follow along as I show you a few techniques to help you troubleshoot your randomly failing a/c compressor clutch coil.
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Due to factors beyond the control of Advanced Level Auto, I cannot guarantee against improper use or unauthorized modifications of this information. Advanced Level Auto assumes no liability for property damage or injury incurred as a result of any of the information contained in this video. Use this information at your own risk. Advanced Level Auto recommends safe practices when working on vehicles and or with tools seen or implied in this video. Due to factors beyond the control of Advanced Level Auto, no information contained in this video shall create any expressed or implied warranty or guarantee of any particular result. Any injury, damage, or loss that may result from improper use of these tools, equipment, or from the information contained in this video is the sole responsibility of the user and not Advanced Level Auto.

Опубликовано:

25 авг 2024

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Комментарии : 239

@alfredocarpaneto5976 3 года назад

My GM was doing the same thing, pressure switch was going bad. $13 at Oreilly. I diagnosed it with my $0 hand scan tool, I wiggled it and got it to replicate the problem.

@JT-lq4yd 3 года назад

13:23 just about anyone can replace an AC compressor, alternator, starter, etc. Getting the correct diagnosis in the first place is a different story, this is what I am here for. Excellent! Thanks for the tips and tricks.

@reggieos6945 3 года назад

fire the parts cannon

@stealthg35infiniti94 3 года назад

Like Ivan @ PHAD always says, you have to be 110% sure before replacing parts. Good job Eric in proving the problem.

@sandybarnes887 3 года назад

Yup, just like Eric O at SMA. These pros rarely fire the parts cannon.

@trevorrigsby8280 Год назад

Bro said it was the clutch and then replaced the whole compressor, etc ,etc… seems unnecessary.

@JoeBribem 2 года назад

You gotta love customers that understand the importance of getting other work done when it's there and apart at your fingertips.

@randydarby2340 Год назад

Yea, thats most likely why there is 300k on it originally! I'm here solving the same issue though I'm only at 225k on my 2000 Silverado, replaced the switch on the dryer already since it was original and didn't cost but $20. My problem still exists though and it quits blowing cold and doesn't get cold again unless i shut truck off and it resets system!

@JoeBribem Год назад

This isn't a duct actuator issue is it?@@randydarby2340

@joebedwell4750 2 года назад

Great concise video that explained why my 2004 GMC Sierra A/C would stop blowing cold air. THANK YOU!

@drgolfjim 2 года назад

Way better video than most. You speak fluently without a lot of ers and ums. Thank you.

@Jpilgrim30 3 года назад

Sometimes they’ll do that when the clutch gap has become too large from wear. Most of those Chevy trucks you can get some more life out of the compressor if you take off the front plate on the clutch and remove the spacer behind it. You can do it without removing the compressor too.

@jcortes3930 3 года назад

🤔

@canalroadadventures5079 3 года назад

See EricO at South Main Auto how to test and then repair the clutch.

@WizzRacing 3 года назад

Setting the Air Gap would not have fixed this issue. As it did work. The Coil was simply breaking down once it got hot..

@Jpilgrim30 3 года назад

@@WizzRacing there is no way to know that without testing it while it was failing. The magnet gets weaker with heat and when the compressor cycles off and back on its not strong enough to close the gap. A bump or vibration can give it the little extra help it needs. To say definitely that they could windings failed when hot when they were never tested under the failed condition is pure speculation. It happens but I’ve had dozens of these trucks over the years in the shop fail this way and I’ve help customers who couldn’t afford getting the compressor replaced get by with just setting the gap on the clutch.

@WizzRacing 3 года назад

@@Jpilgrim30 You can test the coil. Just put an ohm meter on it.. And no setting the Air Gap does not fix it..As it uses a washer. If the Clutch is wore down that far. It needs to get replaced anyways. So why waste all that Freon. Time and Labor. To only have it come back for a failed Clutch.. Just replace the whole unit..

@tallboy2234 Год назад

Very insightful on the Intermittent problem. Have a 06 Chevy Silverado that has just begun with this intermittent on/ off crapola 😡🤬 guess it’s time to visit my own mechanic extrodinaire 🤬

@WaybackTECH 3 года назад

331k miles on the odo is what impressed me.

@victorramosjr2239 Год назад

Finally, a video that pertains to my issue... somewhat. My AC sometimes works. And sometimes it blows "cool" but not cold. Now I'm starting to think its the compressor clutch, especially with 282,000 miles.

@evelioa33 3 года назад

The corridors part was so funny lmfaoo keep up the good work !

@transientemotion 2 года назад

I had this issue in a 2005 chevy silverado. One of the radiator fan relays had a poor connection. So driving the ac would turn off from regular bumps or stop and go. When the ac is on both fans should be on or on another car something easy to check. Press down on the relays see if one or both fans come on with ac on

@MR-dc5ts 18 дней назад

I am hoping this is my issue

@chapin615 3 года назад

The amount of knowledge I gain from this channel !!!Thanks for videos. They’ve taught me alot. 👌👌

@autoacoustics4938 3 года назад

Sometimes its the thermal fuse link inside the clutch coil that gives you this problem , good to see you up getting back on it again

@mercedesfriesland 3 года назад

I like your way of diagnose the problem.

@djosbun 3 года назад

Great video, Eric! In my experience, buying a complete compressor (with AC clutch coil) is almost the same price as buying just the coil itself. Doesn't really make much sense nowadays to not replace the compressor itself.

@pontiacsrule8761 3 года назад

Your videos are always right to the point. Thanks so much for making this, I really enjoy them

@jnew6808 2 года назад

You are the Man! That's exactly what's happening to my 2014 Chevy Express van. But my fan turns completely off for about 10 to 15 seconds. Then blast back on 🤔

@biofall38 3 года назад

You can recover the refrigerant with a recovery tank dipped into an ice bath works really well

@andrewvillanueva4222 3 года назад

Bro you are awesome mechanic. You Eric O, Alex I think name is, put out some of the best car repair videos. Thank again.

@jimbo2.094 3 года назад

Great diagnosis. Being a DIY guy, always an informative watch!!

@JL-qi8lg 3 года назад

1. First thing check your freon. Low on Freon will disengaged clutch as well. 2. Rpm 2000 and check for pressure on your gauges drop.

@angelp9658 3 месяца назад

Good job !! From Sarasota, Florida !! Were the best never Rest!

@jimmyaber5920 3 года назад

Intermittent failing clutch is diagnosed with amp probe in addition to things that were verified on this vehicle. The clutch gap was wide on the compressor as it was visible when he showed the old compressor. Wide clutch gap would still give amp draw of 2.5-4.5 A where failed mag winding would drop amperage to 0. If you don’t have amp probe you let it quit cooling and the safely tap clutch plate to see if bumping it allows engagement. With wide gap the reduced strength of hotter winding is too weak to pull clutch plate into pulley plate and the bump will do it. Windings can have a short (very rare) and do the initial function and then quit but usually these blow a fuse as the current draw goes up. With 300 K miles a new compressor was a good idea anyway.

@HomieHektor 3 года назад

Puro pinche corridos ALV 🎶 Viva Mexico Cabrones!!!

@shinigamidaiko666 3 года назад

My favorite automotive RU-vid content creators gotta support raza

@htownblue11 3 года назад

HEEEEKKKKTTTOOOORRR!!! Good to see you supporting another great mechanic like yourself my man.

@j.maxwaddell2557 3 года назад

GREAT job Eric. I did find it educational. Enjoy

@guitarguy3221 Год назад

Super helpful video i have the same truck same problem 👍 Ty 1yr old compressor no leaks good psi

@jgeorges3061 3 года назад

ERIC, great approach to diagnosing this truck by using the scanner and looking at data always good info thanks for sharing.

@tylerwightman2315 3 года назад

Damn. 300,000+ miles on Chevy compressor! They just don't build them like they used to! You absolutely wont find a newer Chevy that will last that long. Ive replaced several that took a turn south before even making it to 100,000. Nice diag. That's exactly how I would have done it. Love the channel!

@anybody2542 Год назад

Just hit 300k guess that's why my a/c died 😂

@mikerodr 3 года назад

You pull a vacuum to empty the lines of Air / Oxygen & Moisture / Humidity so the Refrigerant (Freon) is more efficient and the AC cools better. After pulling the vacuum shut the valves and make sure the needles hold steady ( 20 minutes) to verify there are no leaks before charging the system. Finally, purge the air in the supply line before releasing the Freon into the system.

@mcrowley8460 2 года назад

2:00 Bro you gotta do that speed lapse & good music at nighttime with the dash lights at max bright next time! Good vid man.

@rubenvilla7705 2 года назад

Man thank you so much bro this is exactly what going on with my truck bro I've been taking it to a couple of people and the tell me different things. Thank again man

@ricardotellez1050 3 года назад

Amazing man ! I'm gaining so much diagnostic knowledge thanks man I appreciate it 🙏

@richard1835 3 года назад

Thank you. Great Video. Worked on a R1234yf system today.

@ahmadalozn7561 Год назад

Respect to the mechanic

@user-dr8jj6sb4g 10 месяцев назад

Great video! I just the A/C components in my 2002 GMC Sierra 1500HD SLE Crewcab. Had the system vacuumed/recharged before and after removing/replacing the A/C parts. Passed the leak test as well. The issue I have is with the A/C condenser fan that short cycles. Can you tell why it does that and how to fix it?

@CraigPetty555 3 года назад

Thanks Eric, for another awesome video!!

@diazhomeservicez Год назад

Keep your very informative content coming and blast them corridos.

@sulemanhabib1743 3 года назад

Thank u for directions on the live data, A.L.A u are too much, lovely job meeeiiiinnnn. Habib Auto all day way from Ghana West Africa

@boomalaki23ii45 3 года назад

Front brakes, 4 struts, compressor and some other AC components all in a day? Hats off to you, that’s a lot of work! Were those complete struts or just the struts themselves?

@dans_Learning_Curve 3 года назад

Like#125 Thanks for the video! Life is a learning curve! HINDSIGHT is 20-15!

@alanmartin729 2 года назад

The hotter it gets the less the magnetism is the air gap might be to great on the clutch just a quess ty nice vidio

@mikerodr 3 года назад

What he was trying to say is that before you break the lines lose rather than releasing the Freon into the Atmosphere go to a bigger shop that has the special equipment that can recover and recycle the Freon to protect the OZONE layer and also comply with EPA Rules. That is was a Pro A/C mechanic does.

@trebrown8144 Год назад

Ozone layer is milarky bud. Same way they want powers to govern over medical emergency is the same plot to take our freedoms and not give them back under the guise of climate, it's all bullshit they are just priming you to take the bait before they even throw it😂

@hectortijerina3950 3 года назад

I've had this problem with compressors like this, you snap the gas wot and the compressor kicks in again. why ? Great diagnosis.

@barstadryan 3 года назад

Most ac systems are designed to disengage the clutch during WOT

@oldbiker9739 3 года назад

@@barstadryan Honda does that as well save the hp on WOT

@PhillyDee215 3 года назад

Summer is here baby🔥

@alex4alexn 3 года назад

got the same truck, would have loved to see what lowside pressure you ended up when all was added ias as i have to do a similar job on my truck. i know it is realated to outside temp but I always struggle with the pressures.

@topher8634 Год назад

Probably could've reset air gap and would've been OK but 330K is a lot of wear on that compressor. Great job.

@rockyrengo 2 месяца назад

VANTASTIC video!!!! THANKS!!

@fire7765 3 года назад

Great job

@mikechiodetti4482 3 года назад

Very good diag. Intermittents can be a p.i.t.a., especially when they're extremely intermittent. Putting the system under load helps to locate it more quickly like you did. Hot weather helps also. You had the shop recover the freon. Did they put it in a container for you to reuse, or did you give it to the shop and you used new freon?

@jonk6137 3 года назад

Still an auto genius

@gaelylesly 3 года назад

a mi también me gustó lo de los corridos. saludos desde el valle

@mikecont9742 3 года назад

Great diagnostic video...

@alialix2076 3 года назад

Man man man ... you are the man ...Thanks bro

@thelastbanana0678 4 месяца назад

hello there i have Issus with my car ac system its chevy impala 2015 when ever i hit 80 km in hours all or sudden my fans stop working and ac also cut off and never work again unless i press ac button off and on again,,, i have vacuum the system and change the ac control valve then recharge with right amount 680g r134 but same Issus still there

@stacydornan9765 3 года назад

Your a smart dude bro,Love your channel

@ganeshnarayan5505 3 года назад

Great video Eric. Thanks for sharing.

@IAMNOSLEEP 3 года назад

Thanks for sharing Eric... Cheers.

@richardrodriguez2750 Год назад

Greate video , well explained !!

@nfl2254fan69 11 месяцев назад

Very nicely done video

@magdalenoybarra2793 2 года назад

Cool vid bro Thanks. Greetings from Texas.

@shaungreenlee2376 3 года назад

I had something similar happen with my 2001 Chevy Silverado Ext Cab 4x4 Z71, I left my truck idling with A/C on and went into store and came out 10-15 minutes later it was blowing HOT air out the vents and the interior temp was extremely high inside the truck, even with the A/C still suppose to be on, however the A/C never stops working while truck is moving and is cold as hell...?

@randallsmerna384 2 года назад

Once you crack the lines the pressure AND the vacuum are lost - So how is it that you can replace the compressor without losing your vacuum?

@peterromero9395 3 года назад

Good job on the video, very informative.

@ezboyrc553 2 года назад

I thought that the compressors would kick off if they were just low on free on as well my on as well. mind did the same thing I just put more freon in it & I didn't have to replace the compressor luckily.

@dannylinc6247 2 года назад

You can also find the cause with the ac compressor clutch. If it has a field coil that opens within itself, there may be an updated field coil to solve the issue. You could check service bulletins and find the part number that stays fixed and doesn't fail again. Two ways to look at it. When it's an aged system, the improver coil may be in the parts kit and save money by not having a later failure unrelated to this repair. A lower mileage truck with warranty would just need the field coil. That how they would be required to approach it in most cases. No interruption to the system, just the engagement being corrected.

@westfield90 3 года назад

I really love your channel

@MusicMinisterJP7 3 месяца назад

Hello,, I'm little perplexed.. I am currently looking to help a neighbor with his Chevy Sub 1500LS A/C.. and I was trying to find the two ports ar which the red and blue hoses connect to. I'm perplexed bcuz I am seeing your red hose connected to "the coolant reservoir??? Is that the location? I can't seem to find it. Can you explain where the high side port is? Thx.

@luis140500 3 года назад

Amazing video man keep them coming 👍

@nestorlugo. 3 года назад

It's a 13 min video uploaded 4 min ago. How do you know? lol

@rrfields65 3 года назад

Expansion valve thermostat going out ! It cycles the a/c clutch on & off to allow any ice formation to melt out of inside coil , especially in hot- humid climates. If the mercury is escaping ,them the switch will not cut on the a/c comp.clutch.

@fernandolopez-db8wr 3 года назад

Eric that background music did not sound like CORRIDOS! Jaja

@anthonysalonek1509 3 года назад

thanks again Eric

@randallsmerna384 2 года назад

Wait, you took this truck out on two separate drive trials trying to diagnose the AC and you didn't discover that the rotors were warped until you took off the wheels? I've never discovered warped rotors by looking at them.

@Donnie_Prestwood 10 месяцев назад

"really warped" rotors - would of felt pulsating in the brake pedal, shake in steering wheel, or both. All that money into the thing and check engine light still on. Car shield would tell you your heading towards more serious problems than the A/C not working properly.

@asarcik 2 месяца назад

when engine hot ; breaking and AC off itself.. after its on and again when ı pressed break off itself.. Compressor is new and no leaks. Ground pr pressure sensor problem ?

@alvaroreyes4707 3 года назад

Good job bro, always love your videos🤙

@stangfan93 3 года назад

I was having this problem, the low pressure line would freeze over and you’d see ice all over it when the ac was in 1-2 setting. But, if you put it to 5, it would defrost and then blow cold again.

@ryans413 3 года назад

Screw the Ac roll your windows down they should really fix that sagging head liner it’s blocking the windows

@USBCablez 3 года назад

Wish I was smart like this

@gabrielrios6830 Год назад

I have a 2015 Yukon SLT that I changed the evaporator core and fan blower.Now suddenly it started to blow hot air .I parked it and turn it off for 4 hrs and turn back on and now is working

@paulszo Год назад

Thanks for the video. I have a 2006 GMC Sierra 2500 with a 6.0. A/C works good as long as your running. Then if I stop for a series of traffic lights it starts to blow out warm air. Cost wise what do you guys get for a job like you did parts and labor?

@patrickphillips7438 2 года назад

I have 03 silverado 240k miles.. My AC cools fine when I'm driving. However when I'm idling at a light or stalled traffic all I get is HOT outside air.

@fredsalter1915 3 года назад

Dang, my brother! You need to buy yourself an AC evac setup!!!

@MrAmk3rd 3 года назад

Eric, when did you record this? The tag sticker on the window shows 2014. Are the tags that old? Good vid, again. Good process figuring out the issue. 🤘

@MrAmk3rd 3 года назад

@@crisprtalk6963 Nope, it's a state tag sticker. I'm in TX. That reads 06 of 14.

@88camaroman 3 года назад

Great work

@cliffordgallagher4531 3 года назад

Always Entertaining and Informative my friend!

@kennethcamilotes7694 3 года назад

GREAT VIDEO BOSS👍👍👍👍

@mrkattm 2 года назад

I would bet if you turned on the head lights the ac would come back on. This is because the clutch is worn out, too big of gap, turning on the head lights kicks on the alternator and more voltage applied to the electro magnet in the clutch which is just enough to pull in the friction plate. Lesson, just put in a smaller shim behind the friction plate.

@davidthomasjr1622 17 дней назад

My inside switch to turn AC on only blinking won't stay on to turn on compressor

@USUFSATE 3 года назад

Sukses selalu lanjut good

@stanghp1 3 года назад

Great work, did you check the MIL light? Or is that extra $, just curious...

@jimboslice8885 Год назад

I replaced my clutch coil.. it engaged after I installed it.. the next day I started the car and the clutch would not engage.. also the fan connected to the pressure switch.. will a loss of pressure keep these components from working.. I suspect low pressure via leak?

@brusk3978 3 года назад

Bro u need open your own mechanics school most video are like “watch me fix this” u take it to another level…

@neilmurphy845 3 года назад

Why is the engine light on for

@charliegcanadianpatriot7781 3 года назад

Man, that truck is a mobile trash can, and what's up with the roof liner ? With regards to the fix and several rides with the scan tools hooked up... why wouldn't you apply a known good 12v power right at the clutch in order to verify clutch operation immediately, then work back from there if need be ? I like your videos, please keep 'em coming.

@GardenDownSouth 25 дней назад

I really wish you lived near me... lol

@h8breed67 3 года назад

Muy Bien... gracias

@turboimport95 3 года назад

Why did you remove fender liner / under the truck etc? I just did the same job and never did that.. I took it all out the top. I got the bolts loose, connector plugs and removed from the top, no under truck necessary. I did have to swap the sensor in the rear of the compressor, the aftermarket one did not have the sensor. Good job though.

@JesusSanchez-pw6fb Год назад

Have u ever had issue were abs and parking break come on and ac shuts off

@Rock_Nemo 2 года назад

Guaranteed that was not the problem, as soon as he took it out on the road and will kick out again, the reason it was reading 100 psi is because the compressor is off and that is both high and low side has neutralized. The problem is the low pressure switch, classic example. He never did do a follow up to verify that it was working properly.

@MrColeman631 Месяц назад

I’m having this same problem clutch engages for about 5 seconds then shuts off changed the low and high pressure switches still have same problem guess I need a new compressor