**READ DESCRIPTION** B58 Coolant Bleed DIY

[@kern417]

Updated Coolant Bleed Process (Vacuum Method): kzbin.info/www/bejne/h5TTlGN7hth7ja8

[@samgrossman]

Your video worked like a charm on my 2020 BMW M340i. “ Service Function Started “ on Cluster when begins and finishes. 🙏

[@wigsareus71]

Garage couldn't sort my intercooler fluid loss issue. 5 mins watching your clip & mine sorted 👌 thanks alot.

[@BoostedorNA]

My AC stopped blowing cold on a road trip. Looked it up and found this vid. My coolant was low so I followed the steps and AC is ice cold again. Thanks for such an informative vid!

[@pranjalsharma8344]

Which one did you fill? The smaller or the bigger one?

[@ZachS24]

@@pranjalsharma8344 He'd fill the smaller. The smaller tank goes to the heat exchanger, intercooler inside the intake manifold, and the a/c condenser.

[@ybliga]

Thanks for this - very helpful. I can confirm I used this process today to bleed air from the low temperature circuit on my 2016 M140i manual and it worked a charm. This is despite this method not being mentioned in the official BMW manual which states that both circuits are bled together by pressing the start button 3 times and actually running the engine, more or less as per part two of this video. When I ran the process, I could clearly see fluid and bubbles moving around in the low temperature tank but there was nothing going on in the high temp tank at all. This would mean that the first procedure only runs the low temp electric pump or could be running both BUT on the high temperature side, the electric pump is not part of the bleed process and it seems logical to me that this pump is only used as an auxiliary to cool the turbo after shutdown. My conclusion would be the first procedure (undocumented by BMW in my manual) does very usefully purge the low temp system by running just the one electric pump and the high temperature side is purged by the mechanical pump, whether or not the second "auxiliary" electric pump is running or not. According to the official manual, the second procedure (and indeed the only procedure mentioned by BMW) does bleed both the low and high temperature circuits at the same time. Either way . . I'm happy with it because I only wanted to bleed the low temp circuit but in future will probably just run the second procedure and bleed both together with the engine running. I don't think the second electric pump plays a part in any of this - I suspect it merely kicks in after shut down to keep the turbo cool.

[@paull2868]

I have been waiting for someone to post this video. Thanks

[@marf28101995]

What I've been waiting for ! Thanks once again 💪

[@bmwsincekid]

This is The Best B58 channel You are like a Master Tech !!!!

[@JK-jr4oo]

Hey buddy thanks for putting up this very excellent how to video. I have only just bought my 440i B58 & discovered the coolant level low in the intercooler reservoir. Fingers X I will give your tips from the video a go tomorrow to rectify the low coolant level. Thank you & god bless ;)

[@gregg8177]

Great Video as always. A90/A91 Supra have a similar but slightly different sequence for Low Temp that includes the 3 quick Start button presses to go into Diag mode before the rest of the sequence begins. After pressing the gas peday a message on the dash about the service procedure beginning is displayed and the pump starts. Electronic pump goes for like 10 min. Ran it 3 times and no more bublles. Hi Temp will be tomorrow!.

[@dubsrevo]

Did you see the coolant moving in the tanks? I did mine today heard some noises but the coolant didnt move 2020

[@austinwesch7136]

I need to fully flush and replace my high temp. Any tips? I’m not sure draining from Lower radiator hose is gonna be enough.

[@Based_F22]

Dam this a thorough video

[@mrtopcat2]

I started watching your channel recently and subscribed. You are a HUGE HELP and I love the way you explain things. 👍 Our B58 is thankfully just went out of warranty. So my wife no longer makes me bring it to the shop to save and get bad work for free. 😂Now I can finally start working on it. 😻

[@user-xb8zw7sk5w]

Just bought a '16 340i and have been thinking about changing the coolant, thanks for such an informative video, also local to the Cincinnati area which is cool.

[@the_batmobile0.4]

Do u leave the cap ON or OFF during the process?

[@tbpom1003]

off

[@jesusmontoya9879]

Great vid! Very informative and in depth. Thank you very much

[@TheJraze18]

Thank you. for taking the time and,to post this master piece.

[@onekind1554]

When you have a N55 but watch all of kerns videos bc you know B58 is the master race (car)

[@kern417]

🤞🏾

[@mrevo9641]

B58 god here ty for these videos

[@frederickh4942]

When you go through the rev process, the caps have to be on. 😮

[@xzszx]

Great video! Works on 330e with B48 also!

[@supremegt]

Always dropping b58 knowledge. Just had to replace my lower aux radiator on passenger side and this video helped a ton afterwards. 2 different bleed processes 👌🏽

[@ArunChhikara]

Hey @kern417 a subscriber here. I have a question. I know BMW suggests using a vacuum tool to do this but I want to do this at home, my theory is that I can use the manual bleeding procedure that allows the system to bleed cooland and get air out from the system to my advantage. I'd take out the hose that brings back the coolant back to the coolant reservoir and take it out from the reservoir and connect to a garden hose that will allow me to extract existing coolant from the system. While I'd keep adding either fresh coolant at the same time ensuring no air entering the system and at the same time replacing the fluid in its entirety. Do you think this would work? I intend to follow the following steps Remove Hose: Disconnect the hose leading from the engine to the coolant reservoir. Connect Garden Hose: Connect a garden hose to the disconnected end. Ensure a secure connection to prevent leaks. Flush System: Start the engine and allow the coolant pump to circulate the coolant. Simultaneously, introduce fresh coolant into the system through the radiator cap or other suitable access points. Bleeding Procedure: Follow the manual bleeding procedure outlined in your vehicle's service manual. This often involves opening bleed screws and allowing air to escape while maintaining a proper coolant level. Monitor Temperature: Monitor the engine temperature carefully during and after the flush. Ensure there are no signs of overheating.

[@davec5237]

Cool, thanks for posting 👍

[@sorakillswitchx]

I've been changing hoses and some parts on my f30-b48, I did the first purge, but as soon as I did the second I got some leaks

[@CadexLaw]

If anyone is wanting to do this without risking the battery dying, I took the cap off, started the engine with the AC on & then waited for the pump to kick on then filled it all the way up, after a few times of doing this and driving around then parking & waiting it gargled all the water down one last time. I might have some air bubbles in the system but the AC kicks on & stays on blowing ice cold with no more coolant drop in the tank. I don’t know if turning the AC on sped up the process at all but I did it anyway just in case.

[@rp1666]

Great video...thanks! I have a general maintenance question: At what mileage would you recommend replacing the coolant for both the high and low temp systems?

[@kern417]

not something that's necessarily needed if the system is working properly. it's nearly impossible to actually drain all the coolant in our cars.

[@harryglover5544]

Very helpful !!

[@viktorszabo9149]

Hey man really appreciate this video very good information on the process. I have done this procedures on my 2016 BMW 330e but it still gives me the low coolant error message… any tips or advise what shall I do?

[@manny619ish]

You should do a interchiller to cool down the intercooler and IAT

[@sidneyhill7834]

If I changed the reservoir do I need to bleed the coolant

[@faraz.f22]

This engine has become something of a religion

[@dubsrevo]

When I tried this I can hear noises from the DME obviously buzzing but also a gurgling slightly but nothing moves in the tanks..ideas? Electric pump dead? Gen2

[@Kawsnfriends]

any update?

[@dubsrevo]

@@Kawsnfriends no idea but the pump started working on its own again which is great, but my fuel pressure started to act up afterwards. One electrical issue to the next

[@armandobocardo1264]

Just wondering, why the need to turn on the headlights?? Never heard of this.

[@kern417]

Processes like these are setup so you can activate them without a programming tool, but also you won't have a risk of turning it on by mistake

[@Carjackd]

If you only drain the front Radiator, smaller tank do you just have to bleed that system?

[@theendangeredpetrolhead]

I have a pre LCI M240i and I tried this and can’t hear the electric pump turning on…

[@stuart290379]

Would you run the bleed process with the expansion tank removed?

[@RSX250]

So electronic water pump is for LT circuit and the mechanical pump is for HT circuit?

[@kern417]

High temp has an electric pump as well as a mechanical pum

[@ybliga]

Thanks for a very interesting video but now I am confused. I have a copy of the official BMW Service manual and it states that both circuits are bled simultaneously. The procedure in the manual is very similar to the method you demonstrated but differs slightly. It clearly states one procedure to cover both circuits. First step is to release the bleed screw for 10 seconds or until fluid seeps out. Connect a charger to the battery, switch on headlights and hazards. Fasten driver's seatbelt. Heating on max, fan on min and then 3 quick stabs of the starter button, followed by 15 seconds with the accelerator depressed and then start the engine. Now rev to 3500 rpm for 10 seconds, followed by allowing the engine to idle for 30 seconds. Repeat this process 5 times and then leave the engine idling at 1200rpm. After 11 minutes, revs will drop to normal idle of around 850rpm and the process is finished. . . . . this is as per my official manual BUT . . . I am acutely aware these documents are not always absolutely accurate and I am intrigued by your method because I do want to bleed my low temp circuit ONLY and if this is possible without running the engine, I would like to give it a go but it is strange that my manual specifically states that both circuits are bled simultaneously with the one procedure. Is this technique something you discovered yourself or is it documented officially?? I'm puzzled. Anyway, either way - I 'm definitely going to give it a go because I siphoned the coolant out of my low temp tank and in doing so and refilling it, I managed to get air into that circuit and it needs bleeding but I don't really want to run the full bleed of both systems as per the manual

[@kern417]

Like i said in the video that's how 2 water pumps are bled. There is still a 3rd pump.

[@ybliga]

@@kern417 I understand about there being 3 pumps and the reason for each. I'm just a little confused that the service manual only highlights the single procedure I documented above and says nothing about being able to bleed to low temp circuit on its own. I will try it and from your video, I'm sure it will work - it's just baffling that the procedure isn't documented in the BMW service manual - only the single procedure for bleeding both circuits at simultaneously with the engine running. The other thing that's weird about the procedure in the manual is it suggests letting the car cool down after bleeding and then topping up to the max level plus an additional 200ml!! This would tend to suggest that even a full bleed can't be expected to get rid of all the air and over a period of time, a little more will be released and hence the 200ml overfill. Anyway, I'll be a happy camper if the standalone method works - will try it first thing in the morning

[@kern417]

I got this procedure from the BMW service manual. It's there.

[@ybliga]

@@kern417 I'm intrigued . . .it definitely works because I did it yesterday but I can't find it in my manual which specifically covers the F20 140i. It could be documented somewhere else in the repair section and I've just not found it . . . could you possibly give me the page number in the manual? In mine, the dual procedure is described on page 5360 of 9308 but unable to find any reference whatsoever to the single procedure - very baffling

[@ybliga]

@@kern417 . . . The explanation is of course that my car is a 140 and many of these manuals are compiled as a cut and paste exercise. With a B58 engine, the procedures should be the same but clearly the two manuals are different - your 340 vs my 140 but . . . the error or omission would appear to be in my manual. That said, I would still vacuum fill if filling from scratch, particularly the high temp circuit.

[@catalin.c]

I left my big cap open and after the procedure was done (rpm dropped) a lot of coolant was spilling out of the tank (engine was hot). So i guess i have to redo this tomorrow morning or just top it off?

[@zlxj]

Thanks for your video @kern417, I was discussing the difference in color and appearance of the coolants in either the low temp. (clear brown) and high temp circuits (blue) from the factory with @NoBrainerTalk. It seems BMW does not recognize any part number for the low temp circuit and people were changing them both tanks to the BMW regular coolant (blue). Was this also the case for you? There is one user who pressure tested at the BMW dealership and found no issues and that their mechanics stated they do not know why the color difference exists. Do you have any more information?

[@kern417]

My car always had blue and i always replace with blue

[@theoutsider6191]

Hi mate, i bought a mid 2019 M240i with this engine in yesterday, and the coolant is a little low in it, still visible in the main reservoir for the engine oil etc but below minimum by about 300ml. So i drew some out to check it before topping it off to make sure of colour and current state. It is a little discoloured with a yellow hue to it, but appears green when light is passed through it at the right angle. Would you say this is normal after 5 years? It is completely clear and not milky and not frothy, so my gut is telling me nothing to worry about cause the temp of the engine is being maintained in range just fine as well. Will most likely have BMW change it for fresh this week though.

[@Deighvid.]

(on a supra) For the High Temp circuit: I started with electrical pump and got the "service function started" notification so it looks like it's working. Then I started in pump 2 and when I started the car it went to 1200 RPM for a second but then said "Service Function Canceled" before I could Rev like suggested. Any thoughts?

[@samgrossman]

Does this coolant bleeding procedure work with the Gen.2 B58 as well ? Thank you !!! Great Videos !!!!!

[@kern417]

Try it and see

[@samgrossman]

@@kern417 IT works for gen.2 !!!! Works flawlessly !!!! Thanks !!

[@kern417]

@@samgrossman 😭 let me see what I can find

[@samgrossman]

@@kern417 🤟🤟🤟

[@kozabuilds]

Should the caps be off during this? Should I loosen the small screw near the larger reservoir

[@kern417]

The dealership does it with the cap on but I do it with the cap off just so I can keep topping off the system. I never loosen the bleeder screw

[@kozabuilds]

@@kern417 thank you boss

[@Kawsnfriends]

hey i replace both radiators and did this process took 2 gallons turned it on and it was empty. is this normal?

[@vividmotion66]

Thanks! Is it the same for B48? Also I only need to bleed the high temp circuit. I didnt see any different in bleeding low and high temp circuit. How do i only start the high temp one?

[@jaxxsper]

Do I need to bleed my system if I only need to replace the bleeder screw?

[@kern417]

No

[@zorantb]

Step 1 is to take the old coolant out, how - wich hose needs to get disconnected to drain all of it? Do you remove both coolant caps at the beginning or at different points, and when do you put them back on? Not sure how this was labeled DIY : / Maybe for people that regularly work on their car and know this but for a newbie like me I'm having to find other videos that actually go through the entire process and outline all the steps.

[@kern417]

This is a DIY for bleeding the coolant system. Look up the definition of coolant bleed. Sounds like you're looking for a DIY for a coolant change

[@DylanMoments]

I'm new to this platform coming from a N54 (still own it) I noticed your secondary tank is also filled clear coolant, is that normal? I was told it should be blue

[@monicahuynh1689]

Great video, thanks a lot. What type of battery charger for this process?

[@kern417]

any will work

[@monicahuynh1689]

@@kern417 Hi Kern, I tried a bleeding procedure on my BMW, but no coolant was coming out. I am using a battery charger too. I think the electric pump is not working. Do you know where the electric pump locate? Does the electric pump have fuses? I am driving a 2018 X3 m40i.

[@kern417]

If it's not working then you'd have issues and codes while driving. Make sure you're doing the sequence properly

[@The2ndKrezzz3]

do you put the caps back on for the bleed process or do you leave them off?

[@射淫师]

OFF

[@EnviousOG]

Hey buddy, nice video. Im flushing the coolant this weekend. No one seems to know, but you seem to know everything about the b58.. Whats the coolant capacity, do you know? Ill be draining both tanks

[@kern417]

Low Temp: 3.9L High Temp + Manual: 9.3L High Temp + Auto: 10.5L If you get 2 Gallons of Coolant and 2 Gallons of water for the 50/50 mix, that should be enough for both.

[@EnviousOG]

@@kern417 cheers mate

[@EnviousOG]

@@kern417 I did the low temp one by removing the overflow pipe and fixing it to a long pipe into a bucket and kept topping it off until it changed colour. I couldn't find an easy way of draining it without removing the bumper

[@thatsabadidea]

I thought there was only 1 electric water pump on the b58?

[@kern417]

As I demonstrated in the video, there are 2.

[@thatsabadidea]

@@kern417 I just can't seem to find any information on this second 2nd electric pump.

[@thatsabadidea]

From what I can find, the b58 only has 2 pump. It's the b58tu the has 3 pumps. So I assume it's the generation 2 (b58tu) you have?

[@kern417]

Seriously? Did you not see me activate both pumps separately in the video? I don't know what to tell you except I explained everything already. But You can believe what you want.

[@giovanniwilliams3050]

I was also skeptical about this , I did the low temp and high temp procedure but only noticed that the coolant on the low side was the one moving with both procedures , I’ve done the procedures maybe 6 times now and noticed the same thing, he might be right

[@demirunlusoy2795]

So this not bleeding this is taking air out of the system after bleeding (draining) all old coolant out and pouring new one in is that right? The word bleeding confused me as I have not seen how can we drain all old coolant out of the car?

[@kern417]

You need to look up the definition of bleeding

[@demirunlusoy2795]

@@kern417 I am asking a question. What do you do at the video? I do not understand. Are you trying to get the air out of the system just with circulation? Or are you trying to get all of the collant out of the car? I do not see any coolant taken out. Which one ? I know english well but I got confused what your trying to do inside the car.

[@kern417]

@@demirunlusoy2795 bleeding a system means you're getting air out. Same with bleeding your brakes, clutch, etc.

[@demirunlusoy2795]

@@kern417 Thank you. I have Bmw G20 with B48B16 (1.6 lt) engine with mechanical water pump. But it also has a secondary small black plastic electric pump as well. Is the procedure same as at the video? Or will I bleed air out through small black screw while on idle as old style bmws?

[@bundazliga9618]

Although I tried both electric pump methods, they both seem to only active the pump for the low temp circuit. The only way I’ve been able to bleed the high temp circuit is to turn the car on and do the revving procedure. Also, is it normal to see a lot of bubbles in the coolant reservoir when doing the bleeding procedure with the car on? I’ve done it twice for 10 minutes each and I keep seeing a lot of bubbles

[@kern417]

Bubbles means it's still bleeding out air

[@jclavarreda83]

Yea i tried the process on the vid but it didnt do anything on my 2017 540i is it just a different process for 540i?

[@rp1666]

@@jclavarreda83 No. All "40" designations relate to the B58 engine, not the size or type of vehicle, therefore the process should be the same. Today (June 4, 2023) I followed the process exactly as described by on my 2018 240I X-drive and achieved virtually similar results, perhaps a bit better than you have. However the cooling system on my car didn't really need any bleeding as I have never replaced any components but since my coolant level was a bit low I'd give it a try, if for nothing else as a learning opportunity. Everything worked flawlessly and I added 200 ml to the intercooler circuit and about 300 ml to the main circuit. Albeit not much coolant needed to be added, at least I now know how to do it, thanks to Kern417!!!

[@W_b58s]

Its same for g20 ?

[@roberthatley7415]

It is for the gen 2 b58 in the Supra so I’d assume so. You’ll know pretty quickly if u can’t hear the electric pumps ramp up in the low temp circuit if it’s different

[@s55ftw10]

Isn’t the B58 equipped with a mechanical water pump ?

[@kern417]

The B58 has 3 water pumps. 1 mechanical and 2 electrical

[@NguyenFamandChavez]

One thing I forgot to ask. Do we still need to do the bleeding procedure if we use a vacuum fill system? Thanks

[@kern417]

It's recommended yes. But should go much quicker

[@AntLive29]

How do you drain and what coolant is ok to use?

[@kern417]

Disconnect the lowest hose on the radiator. Use BMW coolant and distilled water

[@josephcohen5355]

Will this also work for a 430i

[@forshawxwilson2159]

My secondary coolant tank has emptied. I can’t see any leaks anywhere. I topped it up and started the car. It was instantly empty. Should I keep topping up until it stays full? To completely bleed the system?

[@kern417]

I explained in the video how to find leaks

[@Kawsnfriends]

any update?

[@emperorsanders5744]

Do I need to have the cap off when bleeding it. My problem is that very occasionally I will see a puddle of. Oolong on the right side of the car. Car never over heated but this happens at least twice. One time coolant low warning came in and today the wanting didn’t come on but coolant was low

[@kern417]

i recommend keeping it on at least initially because it helps suck the coolant down when the pump ramps up

[@north_tracy]

i just change the water pump on my bmw i8 b38 engine and my heater is not working and im getting overheating do you think i need to bleed the coolant i haven't tried yet

[@kern417]

Yes.

[@north_tracy]

@@kern417 it worked!! i bled a couple times now im getting heat and my temps staying under 100°c

[@demirunlusoy2795]

Is it possible to do low temp bleeding by running the electric pump with headlights + hazards + hot air flow on for 10 minutes without a high AMP car charger? I only have a 4 Amp trickle charger. Will the battery be drained?

[@Rybread98]

Would this be the same process for a b46/48 engine? I have a g01 x3 and looking to do this soon

[@射淫师]

是的，操作是一样的

[@shelbyhaiketic4212]

By bleed you mean drain ?

[@kern417]

No i mean bleed

[@fugitive580]

Hi, my intercooler is leaking(smaller radiator) so i ordered a new one. How do i remove all old coolant from the system is there a drain plug? Thanks!

[@kern417]

No drain plug. Just disconnect the lowest hose on the radiator

[@demirunlusoy2795]

While bleeding air out from both main and cold circuit reservouirs, should cap of the reservouir be open? and, while bleeding air from hot circuit, should the plastic bolt near the cap also need to be turned anticlockwise to get air out?

[@kern417]

Ive done it both ways. And no need to remove the bleed screw

[@demirunlusoy2795]

@@kern417 And how many liters of coolant do I need to fully fill with 50 percent water after a full drain of both hot and cold systems?

[@kern417]

Probably 2 gallons and 2 Gallons of water

[@demirunlusoy2795]

@@kern417 Will I need to use %50 coolant + %50 water at Intercol's Low Temp sys as well? The color of liquid inside the high temp sys is blue, and the color of the liquid inside the Intercol's low temp sys is transparent which confused me that there should or should not be coolant inside the low temp sys at all? Do you know the answer mate?

[@kern417]

@@demirunlusoy2795 yes. All coolant should be 50/50

[@supakiti]

I have a question my lower coolant has a light yellow color abut my high temp has blue coolant is that normal? Or I should bleed it and refill it again. I can't find info else where. Please help thank you.

[@kern417]

It just depends on what it was filled up with but typically it should be blue if you used bmw coolant

[@NguyenFamandChavez]

What vacuum bleeder system work with BMW B58

[@kern417]

There are a few even on Amazon. It's not a special kit or anything, just make sure it has an adapter for our coolant reservoir

[@Milian7771]

U are a genius 🫡

[@aarjunchadha4899]

how do u drain the cooling system say if you wanna do a flush?

[@kern417]

Remove the lowest hose from the radiator in the system that you want to drain

[@emersonmenjivar3178]

@@kern417 could you make a video on how to to a coolant flush

[@samuelcartagena857]

When you’re done bleeding the high temp, after revving it. Will the coolant stop running like the low temp stops? Or will it keep running even when it’s done because the cars on? Or will it drop below the 1200 rpm

[@kern417]

The electric pump will stop running after a while. The mechanical pump will run as long as the engine is on

[@lf4_greg]

After my CSF heat exchanger install, the shop did a vacuum but advised that it may still burp itself a bit over time. I’m noticing an intermittent hum on idle and new electric noise/buzz after shutdown. I’m gonna do this bleed procedure to be safe. For the small circuit, do I bleed it with the cap off?

[@kern417]

I did

[@johnkim821]

The high temp cooling circuit method in the video didn't seem to work on my 2017 430i. The low temp cooling circuit method shown in the video did work. Oddly the method shown in FCP Euro's video: kzbin.info/www/bejne/sInLqKN8r9isidk did work on my low temp cooling circuit. This method did not require the headlights or hazards on. It also turned off the car when it finished the process as well.

[@AnthGott]

Never open coolant cap when engine is warm/hot

[@kern417]

2:15 - Low Temp Circuit bleed process (Heat Exchanger, Intake Manifold, etc.) 4:54 - High Temp Circuit bleed process (Turbo, Engine, Radiators, etc.)

[@izuaff04]

man knows engine....😂😂

[@SpiderGamesHard]

😂😂😂😂😂😂 can you give me the instrumental at the end that shits fire 😆💀

[@kern417]

Let me work it out with my producer 🤞🏾

[@MrBigjoe2400]

Do you bleed the high temp circuit with the cap off?

[@kern417]

I did

[@MrBigjoe2400]

@@kern417 what about the small black Phillips head screw next to the high circuit cap. Should that also be removed while bleeding?

[@kern417]

@@MrBigjoe2400 i didn't

[@MrBigjoe2400]

@@kern417 you are the MVP

[@purewalk1]

My Z4 M40i has had the intercooler changed after sustaining damage in an accident. The garage is following these instructions, but the electric pump is not starting the bleed process.

[@anthonyh958]

Ditch the tape measure and bring back the rubber glove, apart from that quality as per usual 👌

[@kern417]

🧤

[@Top_g80comp]

Should have 2 water pumps …. Not 3

[@tamimmiran349]

Why is the low coolant tank clear??