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Old 12-01-2012, 11:10 AM   #28
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Join Date: Sep 2012
Location: Old Greg's Cavern
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My Ride: '13 128i, '04 330Ci
Originally Posted by willsbma View Post
Sadly mistaken I'm afraid, and this will lead to an overheating situation. My water pump (only 2 years old) had this "fade" problem, where it would circulate and then not circulate coolant. I was finally annoyed and pulled it. Here is a pic of what happened:

The impeller was just sitting there while the shaft spun freely. And to reinforce this even more, the bearings in the pump were quieter than a mouse, so there wasn't any indication that the pump had failed! I found a cheap replacement at Pep Boys for I think $60 made by Bosch with a metal impeller. Good luck with your problem.
Good insight. I've never seen that before. I guess it could be OP's problem, but he's not over heating.
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