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      10-04-2009, 01:51 PM   #8
pruettfan
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Drives: 2006 330i
Join Date: Jul 2009
Location: Oro Valley, AZ

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I would not replace a water pump until it fails for several reasons. One is that I have replaced a failed water pump with a brand new one and had that pump fail shortly afterwards. You could end up replacing a perfectly good part with one that is less reliable. Water pumps are not a maintaince item any more that a radiator, cylinder head, power steering pump etc, all of those components can fail but you normally would not replace them until they failed.