water pump - i just did mine last month. seems like every case where just the thermostat was replaced the X3 was back in the shop for water pump. what you describe is almost exactly what I have.
need to do oil filter housing gasket next - going to wait a few months - there are good threads about both repairs, common on 35i's as I now know
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2018 X3 M40i G01 | Phytonic Blue | Mocha | Premium+Exec | Driver Assist | Adaptive M Suspension
2011 X3 XDrive35i F25 l Deep Sea Blue l Mojave Leather l Sport, DHP, Premium, Nav/Technology, Cold Weather, Convenience [traded in]
2008 328XI E91 Sportwagon l Sparkling Graphite [traded in]
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