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      12-26-2012, 10:08 AM   #9
MyFten
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Drives: 2012 F10 M5
Join Date: Jul 2011
Location: Hamilton ON

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Thermostat, water pump issue.
Your pressure cup has released excess of the pressure inside the cooling system. So you overflow tank is good ( overall )
It is just the waterpump thermo set up that needs attention.
I have done it before, not cheap nor easy to work on.
Sorry for that.