THE LARGEST BMW 2-SERIES FORUM ON THE PLANET
2Addicts
2Addicts
BMW Garage BMW Meets Register Search Today's Posts Mark Forums Read
2Addicts | BMW 2-Series forum Technical Topics Mechanical Maintenance and TSBs: Break-in | Oil & Fluids | Servicing | TSB Hit by the B58 low coolant at about 16,000 miles…

Post Reply
 
Thread Tools Search this Thread
      08-01-2022, 08:46 PM   #1
amutti
Private First Class
84
Rep
160
Posts

Drives: 2021 Convertible M240i Xdrive
Join Date: Aug 2020
Location: US

iTrader: (0)

Hit by the B58 low coolant at about 16,000 miles…

So I had the low coolant light come on around July 12, visibly verified low coolant and call the dealer. The earliest I could get in was today and they recommended I top off the coolant. Between both tanks I had to add more than 3 cups of coolant to get it above the minimum indicators in both tanks (most went in the main tank). Before bringing it in today I verified the coolant was again below the minimum indicator.

Dealer pressure tested and it passed. There is no visible coolant leaking anywhere, including around the coolant cap. They kept it overnight to "QC" it.?

Thoughts? Something else for them to check? 2021 m240i convertible. I read it could be nothing, leaking cap or being consumed by the turbo. I'm not sure the dealer would notice the internal leaking in the turbo.
Appreciate 0
      08-01-2022, 09:05 PM   #2
jzeiler4
Lieutenant
jzeiler4's Avatar
United_States
319
Rep
530
Posts

Drives: 2021 M240i xDrive vert
Join Date: Aug 2020
Location: Hazel Green, AL

iTrader: (0)

There is only one tank for engine coolant. The other tank is for intercooler cooling and it not connected at all to engine coolant.
Appreciate 0
      08-05-2022, 05:32 AM   #3
amutti
Private First Class
84
Rep
160
Posts

Drives: 2021 Convertible M240i Xdrive
Join Date: Aug 2020
Location: US

iTrader: (0)

Quote:
Originally Posted by jzeiler4 View Post
There is only one tank for engine coolant. The other tank is for intercooler cooling and it not connected at all to engine coolant.
Thanks for the clarification. I was pretty sure they were independent, though both use the same coolant, and both were low. The turbo coolant was only a little bit low. The engine coolant was at least a couple cups low.

The car is still at the dealer. They added some dye to try and see where the coolant is going, but since it's a pretty slow loss, I suspect I'll be getting the car back with a "call us when you get the warning again." That's fine, except it seems to be very low before the warning comes on.
Appreciate 0
      08-05-2022, 09:04 AM   #4
cooolone2
Captain
cooolone2's Avatar
611
Rep
699
Posts

Drives: 20' M240iX B58, 01' 330XI E46
Join Date: Jul 2019
Location: NY, USA

iTrader: (0)

Is really not hard to figure... If there's nothing wet, no puddles or wet surfaces on or in around engine, then it's being burnt, consumed! It doesn't magically disappear in a sealed system!

Pressure tested and passed huh? Or within acceptable "tolerances" lol...

I would request a compression test on cylinders, seeing as the cooling system passed hahahaha
Appreciate 0
      08-05-2022, 09:39 AM   #5
aerobod
Car Geek
aerobod's Avatar
3578
Rep
3,555
Posts

Drives: Caterham R500, M2-G87, Macan S
Join Date: Mar 2008
Location: Calgary

iTrader: (0)

A coolant cap that allows steam to escape due to the pressure release mechanism in the cap not holding full pressure is often the culprit, but there won’t be any liquid present, just a small whiteish trace of residue. The system pressure test won’t detect it due to the cap being replaced by the pressure test device.
Appreciate 1
E46ZHP254.00
      08-05-2022, 11:15 AM   #6
amutti
Private First Class
84
Rep
160
Posts

Drives: 2021 Convertible M240i Xdrive
Join Date: Aug 2020
Location: US

iTrader: (0)

Quote:
Originally Posted by aerobod View Post
A coolant cap that allows steam to escape due to the pressure release mechanism in the cap not holding full pressure is often the culprit, but there won't be any liquid present, just a small whiteish trace of residue. The system pressure test won't detect it due to the cap being replaced by the pressure test device.
They said they looked for residue and didn't find any. I didn't see any either.
Appreciate 0
      08-05-2022, 11:54 AM   #7
Kernel Kurtz
Captain
Kernel Kurtz's Avatar
332
Rep
998
Posts

Drives: 2020 M240i xDrive
Join Date: Sep 2007
Location: Winnipeg, Canada

iTrader: (0)

My current car is my 4th BMW, and every one of them has required a small amount of coolant top up now and then. I just assume a very small amount is lost to the pressure venting over time, even when it is functioning correctly.
Appreciate 0
      08-05-2022, 12:41 PM   #8
freakystyly
Lieutenant Colonel
2870
Rep
1,758
Posts

Drives: F22 B58 6MT
Join Date: May 2016
Location: Ontario

iTrader: (0)

I usually check mine every other month if I remember to and usually never in the winter. One random time the main reservoir was under the marker and it took 250ml.. about half a pint to fill. Since then it's been steady at full.
Appreciate 0
      08-05-2022, 09:29 PM   #9
amutti
Private First Class
84
Rep
160
Posts

Drives: 2021 Convertible M240i Xdrive
Join Date: Aug 2020
Location: US

iTrader: (0)

Well it's topped off. The plan is to drive it until the alert comes back (if ever) and then do some math to decide if it's with spec.
Appreciate 0
      08-23-2022, 11:54 AM   #10
pmcmtnbkr
Private First Class
pmcmtnbkr's Avatar
106
Rep
198
Posts

Drives: BMW M235I
Join Date: Oct 2019
Location: PA

iTrader: (0)

Quote:
Originally Posted by aerobod View Post
A coolant cap that allows steam to escape due to the pressure release mechanism in the cap not holding full pressure is often the culprit, but there won’t be any liquid present, just a small whiteish trace of residue. The system pressure test won’t detect it due to the cap being replaced by the pressure test device.
A good pressure tester can also be used to test the cap
Appreciate 0
      10-08-2022, 10:20 PM   #11
Twoforty
Private First Class
Australia
29
Rep
145
Posts

Drives: F30 LCI 330i Msport
Join Date: Mar 2015
Location: Newcastle, Australia

iTrader: (0)

I appear to have the same problem with my newly acquired M240i. (15000km).
Had this same problem with the B48 in my 330i. (30000km).
The dealer performed pressure and no leak could be found....
HOWEVER, at my insistence, they went further searching for a mystery slow leak and actually found it!
They removed the under cover below the engine and discovered coolant leak from the water pump. See image.
This seems to be one of the most common problems with these new engines. B48 and B58 are similar design.
The pump was replaced and problem solved.
Now I got to go through the same thing again with the 240, which is still under warranty.
Attached Images
 

Last edited by Twoforty; 10-09-2022 at 08:01 PM..
Appreciate 0
Post Reply

Bookmarks

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -5. The time now is 10:30 AM.




2addicts
Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
1Addicts.com, BIMMERPOST.com, E90Post.com, F30Post.com, M3Post.com, ZPost.com, 5Post.com, 6Post.com, 7Post.com, XBimmers.com logo and trademark are properties of BIMMERPOST