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      10-10-2012, 08:36 PM   #8
KCX_335xi
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Drives: 2013 335xi e92 | 2013 e70 X5
Join Date: Apr 2011
Location: Oakville, ON

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I did research on this a few weeks back, and it is your water pump most likely... Need to replace it and also put in a new thermostat while you are at it... Parts alone are about ~600 USD @ ecstuning.com, for my car anyways... Realoem.com will give you the part numbers you need.... Good luck !!