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Old 08-09-2010, 09:38 AM
muellesx muellesx is offline
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Location: St Louis, Mo
 
Join Date: Jul 2010
Posts: 9
Mein Auto: 2000 Z3
My experience (at about 69K miles) was that the plastic impeller sheered off; no dramatic bomb going off under my hood, just an immediate and total stop to the flow of coolant. There is no warning for this kind of failure; you cannot listen for any tell-tale signs. Considering the cost of the repair vs. the cost of the eventual tow (let alone repair costs), I'd recommend being proactive. Be sure to replace it with the stainless steel impeller version. Even these have reported issues; the bearings eventually go out. If I hadn't been stranded and at the mercy of the shop I got towed to, I would have invested in an aftermarket water pump.
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