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      08-18-2011, 04:36 PM   #9
queensfield
First Lieutenant
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Drives: 2006 330i E90
Join Date: Aug 2011
Location: So Cal

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Does the frequency of coolant change has anything to do with water pump and/or thermostat failure. From Eninty's thread, I understand that the coolant was changed around 75K, if I remember right. Anyone has any exprience with coolant flushes and water pump failure. I am a power electronics engineer and I work on electric motors. I can tell you that the motors are well built, but the electronics is not. Silicon electronics do not last long when driven past 70C ambient, which in most cases results in 125C at the semiconductor junction.