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      09-30-2011, 06:02 PM   #91
mike3000fl
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Drives: 06 330i
Join Date: Feb 2010
Location: Tampa

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how do you hold it 30 seconds without starting the water pump cycle?

after holding the gas for 10 seconds it starts a 12 minute electric water pump venting cycle, used after a coolant change

See this diy.
http://www.e90post.com/forums/showth...=coolant+flush

the noise people hear is probably the water pump doing its thing.