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      07-26-2013, 05:44 AM   #6
Efthreeoh
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Drives: The E90 + Z4 Coupe & Z3 R'ster
Join Date: May 2012
Location: Virginia

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Quote:
Originally Posted by PA66400 View Post
No, it does not fail gradually, at all. The vast majority of failures are sudden, unexpected and disable the car. Look at the posts in here - almost nobody had "codes thrown", certainly none that cause a CEL before a failure. You will have no warning except your when your car goes into limp mode (really unsafe on an Interstate, BTW), overheat alarm and engine fan running on full blast.

Get your pump replaced proactively. It will be cheaper in the long-run, as compared to a tow to a BMW dealer - do you want to do this while travelling, on vacation?! 85K miles on a 335 pump in an '07 car is just good luck, but it will run out, likely soon.
It does start failing gradually and does throw codes, except you need to scan the car with a BMW scan tool to see the codes. The codes do not throw the CEL because they are not emissions related. But you are correct the pump will eventually stop working and cause the engine to over heat.

To the OP. No one has an answer to your question because there are consistent factors that cause pump failure to point to to make a decision as to when the pump is starting to fail or will fail, other than scanning the car periodically to look for water pump failure codes. So replacing the pump pre-emptively is up to you. What I would do is have a qualified BMW independent repair shop do all the work you are planning rather than the dealer. The dealer will be much more expensive. A pump replacement (w/T-stat) should cost about $800 as a reasonable price.
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