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2010 2011 BMW 5 Series Forum F10 BMW 5-Series Gran Turismo GT (F07) Forums General 5-Series GT (Gran Turismo) (F07) Forum Coolant system issue
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      10-14-2018, 12:40 PM   #1
Pix2
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Coolant system issue

Hello there,

I am novice to this Forum. I was reading all over the topics but couldn't find a relevant to my issue.
My hope is that some expert can answer my question:

I have a 2010 F07 535i GT.
My engine code is N55B30A
The current millage is 140 000 km.

The issue is that the coolant fluid is vanishing from the system but there is no sign of leaking.
I need to top up from min to max at least every 100 km in city. If going to highway then after 25 km the BC notice me to stop and top up.

This whole issues started with change of the cooler radiator which had a leak.
Then I had to change 6 months later the water pump at 130 000 km which went down.

Since these changes I still have this issue which is almost a year know.

I was several times in different workshops where the system was checked for high pressure but we could not find any sign of leaking in the system.

The oil is dark brown as usual. The engine works fine I do not feel any difference.

Where do I need to look, how can I find the leak? Is there any known issue among the F07 users with similar issue?
Please, help!

Is there any method to find out if there is more O2 in the exhaust which indicates that the coolant is disappearing there?

Regards
Pix

Last edited by Pix2; 10-14-2018 at 12:43 PM.. Reason: typo
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      10-14-2018, 12:44 PM   #2
Pix2
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One more info: visited official BMW workshop and there was no clue what to do.
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      10-23-2018, 09:49 AM   #3
Pix2
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Coolant system issue

Please help!

Pix
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      02-19-2019, 10:09 AM   #4
Henryalvarez1
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I'm having the same issue also. I haven't had my water pump changed or radiator but it's vanishing and I have to top it off occasionally..
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      03-06-2019, 09:50 AM   #5
rencxgreg
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Check your coolant reservoir and cap. It might be a bad sealing.
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      05-08-2020, 11:01 PM   #6
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could be a small leak that allows it to escape while driving and stops once the car is off, I would suggest you do a deep inspection of all hoses while running, could me a small hose that is obscured or covered, making it hard to spot
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      05-11-2020, 12:51 PM   #7
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I've had the same issue as well for over 6 months. Took it to 4 different shops, all couldn't find anything.

Let us know if you diagnose it!
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