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Message: <blockquote data-quote="kama" data-source="post: 676190" data-attributes="member: 22947">Hi Kolamp, my engine same as urs N52B25. Replaced my water pump and thermostat mid last yr, pump failed during high speed driving, overheating sign came off. 2 weeks prior to this incident, there is a a humming sound from engine bay, especially during morning drive. After about 5 minutes, sound went off. Went to mechanic next day and confirmed its water pump, I replaced both water pump and thermostat. Mechanic said before water pump totally failed, it might work intermittently, sometimes ok..sometimes not ok.Its wear and tear. I use original bmw coolant, mix it with 505 water.</blockquote>