Truck Repairs: Air dryer purges constantly

[@garymucher9590]

Never hurts to clean up the old value and keep it for another day with a same situation. I do that to a lot if things. Amazing how many times such parts come in handy down the road. Thumbs Up!

[@mvcapitolllc.7894]

Thats why every mechanic has that "junk drawer" its a life saver

[@tomscott8402]

What is going on with mine the truck has brakes but there's no pressure air coming out either glad hand so is it in the proportioning valve causing this problem?

[@sasquatchrosefarts]

​@@tomscott8402if one is having a problem, others are bound to also. Just yank them all and clean them and throw them back in. One trip to the solvent tank.

[@jamesberryman751]

Hey Wes,I'm a long time watcher of your videos...just got placed into a position out of my comfort level, being a mechanic on class 7 and 8 trucks...I'm a Transport Canada trained and certified tank Inspector, for fuel and oil tankers...now have been hired as a multipurpose floor guy, and apparently expected to be a heavy duty mechanic among other duties. Just want to say, appreciate your videos...this one with the purge valve, actually matches my first task tomorrow...thank you, sir...

[@texasjetman]

Another fine example of Wes Working and going into great details as to how the process works, how to troubleshoot the item and also not being afraid to show a shortcut or an item that may have been able to been cleaned and reused saving a little part replacement expense. Thanks Wes

[@sahi3661]

HEY THANKS!!! That little chunk in the check valve gave me hope that I could fix mine after hours on a Friday night without needing parts. Sure enough, mine had a bunch of filter material stuck in there. I have been going crazy listening to that thing. Every 30 seconds at idol, sure.... But every 8 seconds at highway speed!!! Plus it had an extra loud "whistle hiss" that about gave me a heart attack while I was hooking up trailers. Thanks so much! My weekend trucking will be so much more serene.

[@kasper819]

Same problem on my 06 international 9400, I replaced the whole dryer so the check valve should be good right but it's still purging every 30 secs. Should I just try adjusting the air pressure because right now I'm sitting at about 130/135 psi.

[@jamesberryman751]

We have a Pete that says it has 150 PSI on secondary side, but 120 primary. Didn't even think that was possible...thoughts, anyone?

[@dedrakuhn6103]

This is an excellent example of a well done how to fix, diagnosis, test and understand how the air dryer system works on a semi. Thanks I learned a lot.

[@cmpphilip]

Congratulations on your patience to actually find the problem, the difference between a true mechanic and parts replacer. Yes I understand the economics of shop rate to replace a part/unit vs finding the actual problem. Good work.

[@hazel555]

I am training for a CDL in order to drive a school bus; while I'm not a mechanic, this helps me to understand the system in order to pass the tests, do vehicle inspections, and get myself and my passengers to and fro safely!

[@mvcapitolllc.7894]

Spare self-rebuilt parts are valuable, save it! The time and money spent on your diagnosis and repair, priceless! Now u know. how about periodic maintenance to clean and inspect? you will save money in the long run with this knowledge. Also, using the right tools for the job (NOT using that adjustable wrench) is key for not damaging a perfectly reusable part (saves money) and demonstrates professionalism! good job, mechanic!

[@madmodifier]

Your repair video's are great! I appreciate the way you break everything down to it's fundamental parts and operations. Having an overall understanding of all the components of a system is key to quick and accurate problem solving. Thanks for another interesting video!

[@dannymcnamara2554]

Great video Wes !!

[@sammott7176]

Thank you so much for making a how-to video to help people learn the correct operation of a system with good terminology and intelligence! This is a very helpful and accurate video

[@daffymar]

Very good video! Extremely explanatory. Very enjoyable. Great work (only for those who WANT to know)

[@Gstarxpress]

daffymar yup u right man I enjoyed knowing what’s going my truck now. Word

[@tommyg5346]

Great video. I never owned a vehicle with an air system until I bought a Class A RV. Lots of new things to learn and lots of new things that can break. Thanks for the great video.

[@luashelton9320]

I've learned a boatload of info from this video, and the comments section. Priceless! (Longtime steering wheel holder, spoiled by company mechanics. Trying to come clean on my knowledge deficit).

[@WatchWesWork]

Glad you got something from it.

[@rgmoore]

its late, I've had too many beers to have to work tomorrow but it sure it is cool of you to share these videos to keep me entertained!

[@z-zociety-family4045]

Men!! Awesome video. Thanks for posting this up. Im having the same exact problem. It just awesome to know that there are people out there that actually post these problems to help others online. Thank you very much sir. Keep them videos coming..👍👍👍

[@kc360awareness]

Very good and as always transparent about your mistakes. I live try by this proverb… “if you’ve got nothing to prove, then you’ll have nothing to hide.” Yogurts a respectable honest guy. Love the blend of simplicity of your style blended with the occasional PICO useage. Coming from a recent subscriber.

[@scentsofstatess.o.s.8029]

I have been searching the web for Governor ,Air dryer and Air compressor schematics/ Diagram anything to replumb or re route i have a Volvo with a auto partial Air shift that has so many hoses everywhere and just had a guy put on a Governor come to find out the Governor was in my battery compartment so I had 2 Governors lol and I have the biggest mess to clean up behind 2.7 million miles of mechanics and your video has been saved subscribed and downloaded because your the Best man!! Such detail and clear words on how things work well my unloader in my compressor is probably full of that carbon that builds up in my air dryer as the Governor is probably full to from compressor non stop running and damper blowing air constantly. Thank you for your videos Dont ever stop making them God Bless your Money!

[@donaldwilliams6821]

Don't apologize for truck repair videos. Many like me enjoy them. Reminds me of when In Army and working on my duece and a half with maint hut or the 5 ton crane Keep 'em coming!

[@cooperbrown1]

Great video. My Freightliner had the very same problem happen today while making a delivery. Fortunately there was another tractor to step in and finish the job. The dryer only kept one air tank and gauge full but kept dumping the other. Ill see what the shop says tomorrow but thanks for doing this video, it really helped educate me on whats going on with the truck and why.

[@jeffersontrucker8027]

Excellent video can't tell you how many nights I've been woke up by a truck that has an air dryer purging. I'm going to write this video name on a piece of paper and tape it to his window

[@bitwoodcnc7545]

Jefferson Mc Cigrit im here now with my noisy truck , im scare the neighbors come and kick my doors , just hate it

[@claudiosiguenza72]

Very good video Sir ,I am a truck driver and that video is very important to me once again thanks

[@BOBHANNA01]

This,is the best I've ever seen this explained, we would check the governor and then replace the dryer. Thanks I learned a lot today.

[@WatchWesWork]

Thank you. That's essentially what I did. Check the governor, check for external leaks, then rebuild the dryer.

[@marcmilfort4100]

This video is very helpful. I have the same problem on my Cascadia and the mechanic want me to replace the whole air dryer which cost about 2k. Now I have a great understanding what the problem might be. Great video keep up the great work.. 🫡

[@Tnall74]

Sure was glad to see you replacing that desiccant cartridge. Worked for electric utility and those bucket trucks ran almost 24/7 and we rebuilt the dryers every 2 years.

[@astraymark244]

Once again, a great video Wes. I too have been tripped up by skirting over the simple things. Well you know that the job is now done will not cause you grief while out working.

[@leecarroll1817]

ONCE AGAIN GLAD YOU ARE STILL PROVIDING GREAT CONTENT AND TRAINING. I was apprehensive about one of your previous videos and what your future might entail. Quick note, WWW and SMA are favorite/go to sources. Can't say enough good things about you. LWC

[@cbmech2563]

Good video . I have replaced the governor , the purge valve , the check valve (then the complete dryer ) , and then the compressor/unloader head without fixing the problem . 40 trash trucks , 1 spare , 2 mechanics and never had the time for in depth testing . I've been fixing trucks since 1972 and never ran into this problem until 2013

[@WatchWesWork]

It's a fairly common problem, but there can be many causes, as you pointed out.

[@rearspeaker6364]

@@WatchWesWork and 1 rusty ,dirty debris filled air tank can cause this, but its more like a 3 minute cycle, with lower air pressure on secondary or lift axle tanks.

[@MrMobileAutoService]

Hey great video! We don't do a lot of air brake work but a new customer just called for this problem. I'll report back but we thank you for a well done video.

[@j.c.smithprojects]

i suppose you could have just replaced the air dryer but it sure wouldnt be near as interesting of a video wes! i really enjoy your narration. very thorough.

[@marshalllarson8970]

You should have diagnosed further on this one. I always wondered how they worked so thanks for the tutorial.

[@mikemurphy9790]

Great video, pulled my air dryer pff yesterday, exact same symptoms.. now i know what to look for! Straight to the point. Cheers

[@mariogonzalez7442]

Thanks for the lesson, very well explained!

[@wes11bravo]

All underground telephone cables are under dry air pressure. The dryers function pretty close to how yours functions. A system that purges constantly is usually (in my experience) a solenoid valve that is stuck and needs to be rebuilt. Air dryers make me a lot of money - they tend to go into alarm in the middle of the night and I get called out to go fix them.

[@erikjohansson1814]

These are enjoyable videos, a good mix of different jobs.

[@tiredoldmechanic1791]

I think the soft seats were used in the earliest version of the AD-9. I recall when they first came out, there was a problem with leaking purge valves and the repair parts weren't available for quite some time. We needed to keep trucks on the road so we traded the Bendix dryers in on Haldex and Midland. We found them to be more trouble free and much easier to work on and we never went back to Bendix.

[@patb9375]

Farm and Fleet should support your channel! Saved yourself working on it this winter, might as well do the maintenance in better weather when you can.

[@alexandergonzalez6283]

Great job!! Each winter I have an issue or situation with the AD-9 air dryer. Thanks for the maintenance info.

[@jimmyFX]

Hi wes great vid. Being a mechanic myself (30yrs).seen alot of air dryer issues.and how they have changed .but the concept is the Same. a constant purging dryer irritates me.at the same time causes compressor to cycle more.i find it to be the signal line(RES port on gov to wet tank) leaking down .I use soapy water on this line(only when air dryer purges).wet tank supplies air to Governor RES port. For anybody interested Google. Bendix air dryers.and look at images. There drivers. Owner ops. Mech.can identify.what air dryer they have.A very informative site.i still use it myself.

[@roz4747]

So you’re saying majority of the time it’s only a leaking line???

[@jimmyFX]

@@roz4747 that's right,,as soon as the dryer purges,shut off truck and soap down the governor line(which is RES port on the governor),,too many times I've seen dryers replaced over leaking reservoir line to governor.hope this helps.

[@roz4747]

@@jimmyFX thank you for your knowledge and time

[@DIYSEMI]

So cheap these days for a whole new dryer. But I love this video. Was going to make one like this... on my channel but you beat me to it. Love the video, keep them coming!

[@cgrisby1965]

Around $1500 for a New One...you gotta be Rich if that's Cheap to you???

[@DIYSEMI]

@@cgrisby1965 holy crap...is it made of gold? I bought a whole new air dryer for my Columbia for $198.00 at fleet Pride. No I don't think $1500 is cheap

[@kennethklaumann8799]

Just something else to ponder 🤔 in an air loss situation. If the truck just won't hold air very long. An you just can't hear or find a leak. Replace the cloth air line from the dryer to the bugle line, going to the compressor. Overtime the line becomes baked from heat an starts to leak through the cloth. Can't hear it but it's there. Hope this may also help someone.

[@TheBaron97]

Wow you went way above and beyond with this video! Thank you so much!!

[@barneylongacre8123]

Great video very helpful I like your technical approach. Like they say it's fun to work on something when you know how it works, and you do a good job of explaining stuff!

[@sandasturner9529]

Found out that these air fryers on the frieghtliners go out a fairly good bit. When they do, it's because of the automatic drain valve or purge valve. Those darned things have just too many o rings/seals that shrink or crack and leak air.

[@poolmotorrepairguyFL]

The Florida pool pump motor repair guy approved ! that was good info

[@derrickoliver3835]

Thanks 🙏 a million you’re dope. Came in for a new governor and damaged air hose. Then the purging started Having the same problem 2015 freighter liner cascadia. Having them look it over before I leave the shop.

[@anthonylale1142]

We replaced the governor on our f650 and then the constant purging happened. Weird how that happens. Not sure if the leak or this constant purging is more annoying.

[@slicaltimistic1]

😁😁This guy know something here. This is exactly what is doing to my truck now. Might as well replace the check valve and the filter. Nicely done.

[@davelawrence39]

Also if your purge keep leaking air after new is installed. Check the air tank for any damage on the inside.

[@scooter01922]

Another great vid, i know this ones a few years old but nonetheless it was helpful, though not to my wallet. Its so nice you show the part numbers so those of us in a similar situation can just plug em into google, tap a few keys and have parts on the way with very minimal time expended screwing around looking it up. Now when i actually have the time to crawl under my damn truck i'll have what i need handy and if i don't need those parts now i KNOW i will so its handy to have.

[@bienvenidojosejorajuria5125]

You have been a great help I have a 1996 Freightliner did not know about the check valve 😊

[@tihspidtherekciltilc5469]

For customers that don't have time for downtime like the guy I drive for he gets new or reman parts and I get a new toy to take apart and figure out what it's failure points are and what causes them like the homemade log truck project he bought. I think it was tied with your project in terms of electrical splices and corrosion from test light jabs. Glad he let me do it my may and start fresh instead of "fixing" it with more splices. He isn't scared of spending money on inventory either.

[@KevinJones-pj8kx]

I worked on a truck I was rebuilding and ran into the compressor not unloading. The governor worked as advertised. The dryer worked as advertised but when unloaded you could hear the compressor still pumping. In the end, it was a stuck unloader in the compressor that was bad. Free up the stuck unloader piston and problem solved. The engine was an NTC 400 Big Cam III in a GMC Brigadeer. It was a big project. Started with a cab on the chassis. The engine on the ground. No trans. It had been a single rear axle road tractor. The engine was rebuilt by others. I installed the engine along with an Allison 754 trans. Had to fabricate new rear engine mounts as the ones for the manual trans didn't fit. I also stretched the frame and installed tandem rear axles. One big project. I also installed a power steering box in place of the original manual one. I enjoyed the challenge at the time but I sure don't miss it anymore. Ultimately we installed a new Leach trash body on it.

[@stevenpierno9793]

That strap wrench you used was awesome, could be useful in a few applications,

[@darrelfuhrman8217]

Steven Pierno That is a oil filter wrench. I think OTC, NAPA, KD Tools, John Deere.

[@darrelfuhrman8217]

Steven Pierno Go to Lisle Tools, lislecorp.com Part# 63500 $7. Part# 60200 $21. Part# 28500 $15. The first one is the exact one that he was using. Next is bigger. Third is a strap wrench.

[@TheSteereFamilyAdventures]

So found out the problem the governor was 3/4 of the way off dont know why that happened it's been 2 seasons since I checked it so will probably get some semi locking lube to make sure it doesint happen again all is good and purged correctly now thanks for trying to figure it out with me keep on the videos

[@scottsmith2235]

This is an excellent video-you are a quality mechanic.

[@sameuljones5496]

Had the same issue in our workshop. Turned out to be a check valve at the air tank wasnt seating and causing the truck to purge every 30 seconds.

[@darrelfuhrman8217]

I have found Teflon tape pieces in the check valve on the air dryer, in the inlet check valve of the primary & secondary air tanks.

[@robbalinski1606]

I was going to say change your airdyer filter, seeing as how much water came out on purge it was long due for replacement.

[@gregg4164]

I use wrenches that size and bigger every day. Being a union pipefitter we see flange bolts up to and beyond 1 inch and more. Those bolt heads and nuts start getting pretty big.

[@TheBlackxice]

-36°C this video saved my but out on the highway... thank you

[@jonnycando]

Locomotive air driers and spitters get crazy too…it will drive the crew bananas!

[@ChasePalsson]

So lets say I'm having the same issue, and I just replaced the entire air dryer assembly and thought the problem was fixed, but a few days later it came back. I replaced the governor on the compressor and the issue didn't resolve. If I'm understanding your video correctly the only likely culprit now is the air lines possibly leaking between the unloader and the tank or the unloader and the dryer? Thanks for the video btw, great info and basically exactly addresses the issue I'm having

[@younanbadal8364]

I’m having the same issues , I replaced the air dryer assembly and the air governor but I’m having the same issues , I’m wondering if you ever find the problem ??

[@thegregdavieschannel]

Loving this, I'm currently gathering parts to fit air trailer brakes to my pickup here in the UK.

[@calibratedindigo1338]

Classic Cars and Parts for sale UK why do you want to add air brakes to a pickup?

[@thegregdavieschannel]

@@calibratedindigo1338 5th wheel trailer hitch

[@CSSIandAssociate]

Great explanation very good at your explanations of diagnosing a problem.

[@SeanGilmore92]

This is the video I've been looking for! Out 88' Mack fire engine does the same thing. Looks like I've got some testing to do!

[@mattmyers5419]

Very helpful! Very informative and detailed! Thank you very much for making these videos. I'm now a subscriber!

[@robertotoledo1910]

That’s pretty cool, you pretty much rebuilt it completely👌, and thank you for the details appreciate it👋👍✌️

[@darrelfuhrman8217]

On the last 2 out of 6 AD9 air dryers that I have taken apart. The cartridge has been unscrewed just sitting in there. I can’t give you any history on them, those 2 trucks my boss just bought. They came from different states, North Dakota, Idaho. Different truck companies. But odd 2 air dryers with a unscrewed cartridge. I started putting liquid thread sealer on to the cartridge threads to stop them from unscrewing. Anyone else ever found this? One mechanic said that he had found 4 unscrewed, does not think that any of the mechanics that worked any one of these could have worked on another. Are they not being tightened from the factory or a rebuilder? Thank you for the idea, our one semi is almost doing this. Hello from north east Montana.

[@Nic1Moreno]

Alcohol from airline antifreeze possibly eating the thread locker on cartridge..

[@Anand99947]

We are developing sw for this air processing system in india. I am working for an German automotive company. This video I can see the purge valve, compressor governor, reservoir tank etc in real-time. I got only schematics and images. Thanks for the video !!

[@CXensation]

Its quite interesting watching service, troubleshooting and repairs on vehicles different from mainstream cars.

[@73DiamondReo]

good info. Im not well versed in truck air systems but im trying to learn as much as i can

[@TATEXPRESSINC]

Awesome Video!🎥

[@flicndills123]

Great video! Can’t wait to implement what I’ve learned from you!

[@ASPCOT]

The best spitter I ever saw was on my 79 LNT 9000. I don't know what brand it is, it is slightly smaller than a desiccant dryer. It's got fins all over it and it looks like a little still. Never had any trouble with it since it was new, and the truck never freezes up.

[@jimmyFX]

I believe that's a CR Air dryer. Pretty much trouble free.it has no desiccant. Just plastic dividers. Basically the aluminum fin is sort of a cooler. Air enters/cools/condenses/dry air enters service tanks. I believe back in the day they had alcohol injection after the air dryer. For colder climates. Hopefully this helps

[@andrewmccleod7785]

Awesome video thank you for all your help please keep them coming

[@FredMiller]

I would wonder where the metal shard came from? Nicely explained. Thanks for sharing...

[@WatchWesWork]

Carbon build up. Compressed air makes a lot of heat. Combined with some oil blow by and many years of use makes carbon chunks.

[@richardcranium5839]

@4:50 ya got it backwards. the side mounted elbow is the inlet and the bottom is the outlet with the check valve. the check valve in the discharge prevents the wet tank from emptying when the dryer purges. the ad9's were made so you could service all but the dessicant without tearing the whole thing apart. lots of problems with the ad8's caused the design change.

[@WatchWesWork]

You're probably right. Sorry about that.

[@richardcranium5839]

@@WatchWesWork its all good

[@KeyserSoseRulz]

You should write a book with all troubleshooting experiences you learned.

[@Pete-from-Tn]

Air Dryer can only hold so much moisture. When the Incandescent beads soak up all they can. That is when you have air dryer issues. Most people only think about this part. When it messes up, when that cartridge being changed out. Would save all the issues. On some of the cartridge's like yours. You can dry out the Incandescent beads. In an oven,and use them over and over.

[@WatchWesWork]

Yes, the desiccant cartridge can be rehabbed. But, it's only about $20 for a reman.

[@Pete-from-Tn]

@@WatchWesWork I agree, but have been caught. And had to dry one out a few times.

[@razullahghiasiy4065]

I had the some issue it kept purging repeatedly while I was driving too After watching your video I changed the purge valve nothing changed same issue then I changed whole Air dryer assembly but unfortunately still have some issues still purging while I am parked and driving

[@abdulsumana8098]

How did you end up fix it?im having same issues

[@James-fs4rn]

More interesting stuff. Thanks for sharing Wes.

[@Netherlands031]

Quite hard to follow for someone who knows nothing about pneumatics - help me out here, was the problem the air dryer purging all the time? Or was the problem: air leaking out at the compressor, making the compressor work to keep up the pressure, therefore the governor decides that a lot of purging is needed?

[@465maltbie]

Blairs farm and fleet, I wonder if he is family? Thanks for sharing, I dont work on trucks but watching you do the troubleshooting is great, thanks.

[@WatchWesWork]

Blain's. There's also a Blain's Fleet Farm. Same family, competing store. Very common in Illinois and Wisconsin.

[@organic7771]

The inline elbow check valve might be mounted on wet air tank( actually its one way walve, cause check safety vale is different one on air dryer housing) .

[@alfredocolon4665]

Nice video amazing training , I have same problem in my truck 🚛

[@theaveragejoestinkeringand4407]

I was working on a 2000 379 Pete with 12.7 Detroit and that Truck had those cloth wrapped hoses. You couldn’t hear a leak and it was very slow took me a while to find it I found it by accident while I was pressure washing the truck as soon as the soapy water hit that line about 2 feet of it just foamed up. You couldn’t hear the leak but you could definitely see it so I always made sure on any truck that had those lines especially going to the fan clutch Because it seems like every one of them was bad when I started checking. I would degrease them once a month with air pressure in the system and run the truck a little and look for any foaming air lines. Found quite a few leaks that way.

[@AwayToMeBus]

Wow, great walk through! I have a 92 international bus that's purging every 30 seconds, it also seems to leak after I shut it off. First time I heard it, I thought there was a wounded animal nearby lol, it's a very faint squeak, kinda like the dying witch on wizard of oz 😁. Took it to a local diesel shop and they told me I needed a new air dryer, no filter on mine BTW. I'm just wondering now if they checked the valves....i didn't know the squeaky sound after shut down wasn't normal.

[@jazzs7480]

Lol nice

[@half-assedgarage6668]

Here in the rustbelt of Michigan we replace the whole dryer. Like you said it about a wash either way.

[@rearspeaker6364]

its all about time and reliability.

[@donmccord]

Ole Cummins m11 in that truck same motor as my 96 kenworth k100e I’d recognize it anywhere had same issues with my system purging every 30 seconds too did all the same things you did didn’t fix it couple weeks later it started working properly 🤷‍♂️ working great ever since

[@MikeMcAuliffe-g2f]

Wes, did you kiss that check valve? That's why it re-seated. :) Most of these repairs are due to daily maintenance, or not doing it. The compressor is the most important part IMO, so that dirt floating around on the purge and/or unloader is gonna get to the compressor. Keep it clean.

[@gamalielportillo6459]

Enjoy the video I have a 2001 peterbilt model 379 I am having issues loosing to much air when I apply it It drops from 120 down to 90 No air leaks anywhere If I apply the brakes again I will go from 90 to 60 I have installed AIR COMPRESSOR AIR DRYER AND A GOBERNADOR COULD IT BE THE FOOT VALVE? Thank yin advance

[@frankrodriguez7468]

Very useful video.....thanks for sharing and trust me......I know it took time but anyone watching this video thanks you also for the knowledge.....👍👍👍

[@johnhenry1395]

What should be the “normal” purge cycle for the air compressor? Mine purges about every 7-10 minutes when driving and maybe every 15-20 minutes when idling, which both seem too often to me.

[@rearspeaker6364]

that's almost normal, must be a very minor air leak somewhere. if the DOT inspectors haven't found it for you, some dish soap and water in a 1 qt. sprayer will find it.

[@simpletruckerstuff9478]

Very good detail. I will check my check valve. I have the small filter & it blows air out a built in weep hole on the side. And I don't know why. Do you? Thx 4 vid.

[@sdes-el9wl]

the service interval for the cartage is once a year to every 6 months for really wet areas. at least once a year on a ad9

[@frederickwatkins2017]

Gotta love when you've driven 600 miles for the day and find a parking spot at night where that son- of- a---- truck is doing that next to you all God damn night !!!

[@jamesmiller7911]

Lol And its a comfortable 60ish degrees outside, so why do they need it running anyway?

[@Drivenout]

Unfortunately my truck just started purging constantly, and its a company truck so I'm going to have to deal with it until i bring it back for service.

[@beats8498]

Great video!!! I was leaking bad from the purge valve so I rebuilt and it’s no longer leaking. However, it only purges 1 time after air pressure builds then I lose around 10 psi every 10 minutes or so from somewhere else. I hear an audible hissing from behind the glove box and dash. I pulled the glove box out and it’s much louder. Sounds like it’s underneath the glove box. Trying to wrap my mind around what the cause could be. Wet tank?

[@Bendigo1]

Either hvac mixer valve or parking brake lines.

[@dratesyouneed]

Great Video man 👍 But im having a situation here where I got the Air dryer, air governor , and an air compressor relatively new (less than a year old) replaced because my air dryer started purging after I switched the air governor to a new one thinking it’ll fix the reason my psi hits 100 not 120 (adjustable). So point is I got everything replaced except the air tanks. Could it be that ? Also I have no air leaks.

[@patb9375]

OK but did you figure out how that hunk of smugh got in the check valve? Did you clean the line and see if pieces of smugh are coming out of the compressor? It is sealed so it did not appear out of nothing. You are not done till you figure out what caused the smugh and clean it so you do not get djizm all over your new check valve. Good video explaining what you did for trouble shooting the problems, as you noted you ran into a leak you may not have noticed but would make the compressor work more and effect fuel use. Good catch good job.

[@WatchWesWork]

It's just carbon build up. The intake for the compressor comes from the crank case. The compressor outlet temp is pretty warm. Over time you get carbon build up, just like an engine exhaust port.

[@1waukesha]

I had the same problem a little while ago. The guy who changed the cartridge filter was a little careless and a small pebble got in that check valve.

[@ryancarter7167]

Truck videos are the best!

[@abrahamarcadi7561]

Hello friend, I have a cunmin isx15 engine, I put a new dryer and a new compressor and it keeps blowing the air every 15 seconds