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Old 06-16-2020, 02:48 PM
rdfreedom75 rdfreedom75 is offline
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Mein Auto:
coolant leak

I have a 2012 650i convertible with the N63 engine and just shy of 95K miles. Recently I got the engine drivetrain warning - shut the car off, turning on and it reset. Soon after I got a smell of losing coolant. Took it in and diagnosed a lower coolant hose needed to be replaced, which I had the dealership do. Soon after I got the drivetrain warning again and this time I used a scanner app and found it was the #6 misfire - so I replaced the coil and the plug (still got the error after the coil, but figured it was time to just replace both. At the same time, got another coolant warning. Took it back to the dealer and they said it was most likely an air pocket. The took a look, topped it off and said to keep an eye on it. Soon after, another drivetrain warning... this time #8, so I jut replaced all of the coils an plug (its 95K miles after all). I kept getting the error, this time on multiple cylinders. While doing the job I noticed the 1-4 crankcase breaker hose was broken (most likely did it when removing the air filter since it was brittle.). So i replaced that thinking maybe that was causing it to run lean and give me the P300 error. Replacing it didn't help. Frustrated, I took it to the dealer. Sadly, I must have not made a good connection on the #3 coil because that was the issue. However, while there (different dealer BTW), they tole me I needed to replace the turbocharger and crossover coolant lines - to the tune of nearly $4800!

I did notice some dried coolant on some hose ends (see attached) when doing the other work. And I am getting noise from the secondary coolant tank (for the air coolers I believe?).

Does anyone know what the hoses are in the picture are related to? Air cooler system? Are they the "crossover coolant lines"? I want to replace them but I am confused if this is the problem or is there is something else?

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Old 06-17-2020, 04:13 AM
645/333's Avatar
645/333 645/333 is offline
Location: UK
Join Date: Jun 2010
Posts: 2,186
Mein Auto: BMW 640i SE Convertible
I am not familiar with the layout of this engine, you could access TIS or EPC and this will give enough indication. TIS will help to repair as those hoses look like they have been leaking for some time. Worth changing those hoses and going from there!!

Always said I would go back to a 6 series
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Old 07-08-2020, 05:57 PM
Olys Olys is offline
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Location: Oviedo, FL
Join Date: Feb 2018
Posts: 29
Mein Auto: 2012 650i
I had the same problem. See if this thread will help you out.
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