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E90 Auxillary water pump

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Took my 330D for routine oil service last week and the technician let me know that there is a fault code about the aux water pump in the memory, apparently its used with the heat exchanger for heating in the car.
I asked him to pull it off for me as the car is at BMW anyway for servicing.
at my workshop I checked it with the bench power supply, sure enough it did not start.
I pulled it apart, cleaned it and after testing took it back for them to install again.
Saved a couple there I reckon!
Also changed the coolant as well!

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