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      11-09-2012, 09:25 PM   #3
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United Kingdom

Drives: 320i M-Sport June 2009
Join Date: Sep 2012
Location: Hampshire UK

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I would be pretty certain the system needs the air bleeding out of it, if you ran low on water which you said happened then it will almost certainly be that.

I see you had it bled all ready, but obviously not properly, it can be very tricky to do.
I've not done it on my (or any BMW) but had to do it on a couple of other cars I've had.

I would get them to do it again, engine warm, pressurise system, heater on full blat… it can take several attempts..