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Sounds like a failed water pump, right around the same mileage mine failed. Replace both the pump and the tstat at the same time. Also inspect your radiator or expansion tank for leaks or seepage, might want to just proactively replace the tank since it's not an expensive part. FWIW inteplaced my wp and tstat At 89k die to failure, and my expansion tank and radiator were replaced last month at 145k due to seepage and a small crack. On a 2007.
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2007 E92 335i MT
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