Mercedes starts and dies after replacing air compressor relay

[@jg_promotions5827]

Thanks , that is good info. I have an 03 E500 , just installed new compressor and went to replace the relay. New relay only has 4 pins, old one has 5, sounds like I need to reinstall the old one and go to the dealer to get the right replacement relay.

[@accountmelbourne8963]

Incredible video! Great communicator.

[@dewayneward2751]

Hi Lou, Replaced the pump & control module with new relay. Car has the up dated board. Car runs a few seconds and shuts off.

[@MasterTechLou]

@@dewayneward2751 sorry for your troubles. A bad mass air flow and or plugged exhaust can cause the same.

[@jamesoconnor3017]

Wow! Brilliant information thanks mate, very much appreciated as Always! 😎👍

[@valibircu926]

I found the problem, it's from the valve block, the cushions are good

[@MuhassinShepherd]

Thanks for the information I opened the back of my fuse box and sure enough my scrap is pop I just ordered a new fuse box

[@curlymyhero]

Don't have a GL but complex stuff anyway Lou. Thx!

[@vasileios_glystridis]

Thanks! Bravo Lou... congrats.

[@MasterTechLou]

Thank you so much! That is truly appreciated ❤️

[@vasileios_glystridis]

@@MasterTechLou how can I contact you

[@MasterTechLou]

@@vasileios_glystridis contact me for what? Usually through instagram or justanswer.com

[@vasileios_glystridis]

@@MasterTechLou need some help with a 08 e550 suspension issue. Send me a link ....

[@MasterTechLou]

@@vasileios_glystridis www.justanswer.com/car/expert-lou-p/

[@anhthien74]

This is helpful..i replaced my air pump relay on a 2011 GL450.. aftermarket replay.. this is happened to me.. DONT dont buy aftermarket relay for Mercedes.. 😢 happened to me... so Dont dont

[@mikimiki195]

This is Gold information Thanks Lou 👍🏻👍🏻👍🏻 Where this fuse box located?

[@MasterTechLou]

Engine bay

[@bozniaboznia7734]

make sure you take negative from battery before any work, keep old relay and fuses in place while replacing just take negative off and you will be fine

[@samuelnyonyogbe5858]

I just had a 2010 GL450 that was blowing F122 (25A) for the starter. The previous shop changed the starter and still was having the issue. The claimed they changed the under hood fuse box.

[@leventak911]

Hi Lou, how do you open that back cover on the fusebox in your hand? I tried to open it cuz I suspected a ground issue (and I was right) but couldn’t figure it out. Can you do a video maybe? Thanks, that was very useful info!

[@anhthien74]

Thank you so much..Greats greats info

[@RichS-xr6xz]

Lou I'm getting ready to change the air shock that blew out, but I have a question before I do. When it blew out I was sitting parked with the car idling. What do cause the shock to blow out. Days prior I had a problem where both fronts where real low but the rears where high. So I pushed the raise button which worked for the few days then the front right blew out. I then changed the valve block. After the shock blew, what do you think is happening Lou

[@MasterTechLou]

@@RichS-xr6xz you can have a sticky valve block that keeps air going to the bag when it should not. You can have rusted links on the level sensor so the true level is not known so it keeps pumping air.

[@RichS-xr6xz]

@MasterTechLou As always Lou, thank you for your quick and knowledgeable response. Tomorrow, I'll start removing and installing the new shock, hopefully all goes well. Thanks again, you're a true Mechanic

[@caroundholger504]

I replaced the compressor on my GL 500 including the relay. Days later, strange messages appeared on the display, LR malfunction - visit a workshop, airmatic malfunction, pre-safe not working. According to these reports, while we were on vacation last week, the engine went into emergency mode and hasn't started since yesterday. Could this all be due to the aftermarket relay?? It is a 2009 march Version of GL 500, 4MATIC

[@auck1969]

I read all these comments where people have questions and need help but this guy just ignores pretty much everyone. It's not like he has a bunch of subs and I understand why. Don't have a KZbin channel if you don't want to help people. Especially claiming to be a mechanic. I've also read comments where people ask simple questions and he's a total wise ass. The only time he responds is when somebody is giving him a compliment. I suppose he has a channel to stroke his small ego. Some people's kids.

[@CL500MBZ]

Great video

[@RichS-xr6xz]

Lou I just changed my valve block but prior I heard a loud pop like a shotgun shell. After one shock FRont right sounds like it's leaking big time. Would a blown shock prevent the rest of the car front rasing, the compressor comes on for about two minutes then shuts off. What do think Lou. Richard

[@MasterTechLou]

@@RichS-xr6xz the compressor doesnt put out much volume. So yes a blown shock will prevent the rest of the car from raising

[@RichS-xr6xz]

@MasterTechLou Master Lou thanks for your quick response. I will order a new shock asap, after installation I'll report back if thanks OK. RICH

[@nelsonleonard4862]

Yes boss, I gat u ... thanks

[@salamjosal]

Hi Lou I have a 2015 Mercedes-Benz GL 450. The air compressor has no power I checked the fuse has no power. I took out the relay and there’s power in the relay and the relay works perfectly fine. What do you think is the problem could you help please?

[@jeffreycicero6685]

Great video Lou. Forget electrical engineer, you should be a college professor. Lou on the test that you're talking about, where you pull the airmatic relay out and try to start the car, will it be a crank no start, or a no crank no start? My R class has a no crank no start problem.

[@MasterTechLou]

No crank no start, if you have no crank no start at the moment then you may have bad starter

[@thenotoriousrvh6091]

I've been watching quite a few of your videos, good stuff. I'm thinking about getting a 2011 GL450 V8 (no mention if turbo) 110,000 miles. Are there any specific items I should know about it ? Youve made me less afraid of "airmatic" actually looks quite simple. My mechanic skills are very novice. I can do basic maintenance items. Not scared to try anything lol. Should I run or seriously consider it for $12,995 ?

[@MasterTechLou]

Have it inspected before buyin. Those cars were solid but over the years no one has taken care of them. If it was already “dealer” inspected then take it to another dealer or shop.

[@noel7366]

I have a 2013 S550 and I'm experiencing an issue where the right side keeps sagging. The suspension compressor stopped working, so I replaced it. However, the new compressor still doesn't turn on. I've checked the relays and confirmed there's power. My question is: if the valve block is malfunctioning, could it prevent the compressor from turning on at all, or should the compressor still activate regardless of the valve block's status? Essentially, I want to know if a faulty valve block can stop the compressor from even starting up.

[@rodneyporter3136]

Man thanks sooo Much

[@treythebaked595]

Hey brother I swapped fuse box relay fuses… pump air compressor but car starts up but pump does not turn on its brand new.

[@tuanle-bz1qm]

Where do I get the updated fuse box? Does the new one come with all the fuses and relays installed ?

[@MasterTechLou]

@@tuanle-bz1qm I commented on this before, YOU do not get an updated fuse box. You get the same one. Mercedes updated the fuse box in later years. They are non interchangeable

[@tuanle-bz1qm]

@ so the ground in my fuse box is blown - I wish that I could find your video before putting in my aftermarket air compressor relay. Can u do a video of how to remove the fuse box? Where do i get a new fuse box ? When I get a new fuse box, do I need to get all the fuses and relays from Mercedes as well or can I use the old ones from the blown fuse box ?

[@tuanle-bz1qm]

@ is there a way that I can fix my old fuse box or do i have to get a new one ?

[@Beast_Benz]

Thanks!

[@MasterTechLou]

Thank you!

[@taylorwilliams1185]

This video may be a life saver. My 2 questions are what power source does the new tab in M4 tie into? Also, is the rest just plug and play or is there more to do? Thank you!

[@MasterTechLou]

@@taylorwilliams1185 im not sure you understand the video. There are 2 versions of the fuse box. Its not a “new tab” so to say. Its the power wire for the compressor.

[@taylorwilliams1185]

@@MasterTechLou In the video you said that the compressor gets its power from somewhere else.

[@taylorwilliams1185]

I have the fuse box without the M4 Tab but want to update the box to the newer version. Is my current wire harness suppose to have a red wire that will already connect to the updated MR4 terminal?

[@MasterTechLou]

@@taylorwilliams1185 you dont “update”anything. Mercedes changed the box during a model year change. These are not updates that need changed In earlier models. You need to order the correct box

[@taylorwilliams1185]

@@MasterTechLou I understand know. Thank you for the clarity.

[@clabruno]

So I have 2008 Mercedes gl450. I went to the front fuse panel and noticed the air suspension compressor fuse was blown so I replaced. Two seconds later the same fuse was blown and the air compressor never turned on.

[@MasterTechLou]

@@clabruno most likely locked up air compressor

[@mufiddurmis2998]

Thanks for info i did get one from Mercedes dealer OEM with 5 prong but i have problem with airmatic 40A fuse burn after 30 min driving car why is burn the fuse. When i install new fuse working fine for 30-45 min then burn again !

[@MasterTechLou]

Bad compressor or poor connections at compressor

[@MasterTechLou]

Actually I know you just said you got a dealer relay, but be sure you installed it in the correct position. We have relays that will burn contacts and stick closed causing the compressor to run till It seizes and blows the fuse. So the issue is either the relay, or the compressor or connection to it.

[@boandersen2895]

So, how do you remove the strap and solder in a replacement?

[@MasterTechLou]

Its not a strap its a path in the circuit board. You’d have to solder in wire to each contact the ground “strap” touches.

[@itsCarolineCole]

I’m going through this same issue and I’m having trouble finding this “circuit board”. Do you have any search terms that might help?? Ugh 😢

[@MasterTechLou]

@@itsCarolineCole its called a fuse box

[@valibircu926]

Hi,I have an S Class 2007 W221 320 CDI and I have 20 km to work and after 10 km the rear axle completely to earth and and error in the dashboard malfunction and an arrow up

[@MasterTechLou]

Hello, sorry to hear of your troubles. My air suspension video explains what needs done and most possible solutions. Thanks. Lou

[@nelsonleonard4862]

I want u to be my teacher always...

[@aarondavis8433]

does this effect airmatic in a 08 e550?

[@MasterTechLou]

Only the cars I mentioned specifically

[@Vivianauxito]

Awesome video,Lou. We produce LEDs for auto. And we wanna invite you to do a review video for our product. Is there any way to reach out to you.

[@MasterTechLou]

Thank you I appreciated that. Sorry I barely have time for the reviews that I do for products to help people diagnose and work on cars. I dont think thats a good fit for me or my channel as I’m not trying to sell products. Im tryin to help educate on how things work to help make purchasing decisions easier. Im going to eventually get away from product reviews and more into how to’s and tips and tricks.

[@narcissistinjurygiver2932]

can you solder the ground strap to repair it?

[@MasterTechLou]

yeah I have seen people do that. but in my channel I dont want to steer down that direction, I choose to replace things rather then fix them as you never know what other issues you can create. I am not saying my way is the only way, but in my channel i want to teach the proper way of doing things. I hope you can understand.

[@narcissistinjurygiver2932]

@@MasterTechLou i understand. I was a mb dealer tech for many years. on my own since 08

[@saharakustoms]

So can the fuse box be replaced with the newer style of you have the older style? Or does it have to be replaced with the older style?

[@mohmedjafar1102]

It's a bentley it won't start with smart key and it won't lock in. Can you tell me what the problem is?

[@MasterTechLou]

No I cannot. Sorry

[@narcissistinjurygiver2932]

yes. You need to jack up the license plate and slide a new car under it.