I have a 99 328I with 140,000 miles reasonably trouble free so far. Should
I pre-emptively replace the water original pump and at what mileage? Otto
at Bavarian Autosports thinks I should. Anyone out there has an opinion or
recommendation, or some experience? I plan to keep the car until it dies
because simply cannot afford to replace cars unless there is a very very
Thanks for all responses.
Water pumps do fail. Lots of people, including the Roundel tech guys,
prefer to replace them at some interval (ranging from 60K to 100K miles.)
However, when they do fail, it's usually not a big deal as the leak from
the bearing is easily evident. Caveat: if you have one with a plastic
impeller it can clog engine/other coolant passages and the engine will
Given all that, the radiator and especially the expansion tank can
fail catastrophically and you'll probably lose the engine, unless you
IMMEDIATELY stop it.
I've got a '01 330xi; I've changed the radiator, expansion tank,
thermostat and hoses (at 100K) but still have the original pump.
Mike Miller, the tech guru for Roundel and Bimmer mag, suggests replacing
the water pump at 60K. It's not that expensive unless you go with the
Stewart aftermarket pump which allegedly is made to a much higher standard
(roughly 3 times the cost).
R / John
Thanks for the responses to my previous question. Now I have to ask a
different to get to the answer I am seeking. The water pump will fail
eventually, but what is the likelihood that it will also lead to engine
damage due to plastic impeller pieces getting into the cooling system?
If the likelihood is small, it may not be worth it to change the pump now
(at 140K miles). I inderstand that at the first sign of cooling system
problems, I am to stop driving, and unless there is a visible leak, given
the circumstances, I am to change the pump and see if there is still a
Thanks again for your responses.
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