The water pump is electric. I did mine last year, best to change the thermostat as well since they usually fail in close timelines. Go with the Continental VDO version, which Turner lists as Part# 11517632426. This unit replaces the old BMW Part# 11517563659.
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2011 BMW 135i M Sport Space Grey - BMS JB4, VRSF 3.5" catless DP, Berk exhaust, BMS intake, ER CP, Eibach Pro-Kit, H&R spacers, black kidneys, Blacklines, LUX angel eyes
2014 BMW X5 xDrive 35d M Sport Mineral White - MPBK w/ F85 rotors & Carbotech pads, ACS Springs/Links, iND reflector deletes, iND black roundels, MP black kidneys, M50D grille inserts
2007 Suzuki GSX-R 750 - too much to list
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