My fellow bmw owners/mechanics (lol): is it necessary to do a coolant flush when changing the temp sensor? please advise.

It is not necessary.You will want to have some coolant because removing this sensor will drain out coolant. Be sure to refill and bleed your coolant system.You don’t have to remove fluid to install, but make sure to have a rag ready In case. Just pull the metal clip and disconnect electrical connector, then pinch side plastic sides to release from the metal elbow. Note a part model has it in the elbow separate from the thermostat housing that other models use

Does this fit a 2003 bmw318i?

If somehow that car has a variant of the N5x engine in it, then maybe. Realoem dot com can tell you for sure, though.

523i ?Is the model input wrong?Fitment follow: BMW 128I 2008-2013 BMW 320I 2001-2005 BMW 323CI 2000 BMW 323I 1998-2007 BMW 323IS 1998 BMW 325CI 2001-2006 BMW 325I 2001-2006 BMW 325XI 2001-2006 BMW 328CI 2000 BMW 328I 1999-2013 BMW 328XI 2007-2008 BMW 330CI 2001-2006 BMW 330I 2001-2006 BMW 330XI 2001-2006 BMW 525I 2001-2007 BMW 525XI 2006-2007 BMW 528I 1999-2000 BMW 530I 2001-2007 BMW 530XI 2006-2007 BMW 540I 1999-2003 BMW 545I 2004-2005 BMW 550I 2006-2010 BMW 550I GT 2010 BMW 645CI 2004-2005 BMW 650I 2006-2010 BMW 740I 1999-2001 BMW 740IL 1999-2001 BMW 745I 2002-2005 BMW 745LI 2002-2005 BMW 750I 2006-2011 BMW 750IL 1999-2001 BMW 750LI 2006-2011 BMW 760I 2004-2006 BMW 760LI 2003-2011 BMW ALPINA B7 2007-2015 BMW ALPINA B7L 2011 BMW M3 2001-2006 BMW M5 2000-2016 BMW M6 2006-2017 BMW X3 2007-2010 BMW X5 2001-2013 BMW X6 2008-2011 BMW Z4 2003-2010 BMW Z8 2000-2003

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Description

Compatibility: This engine coolant temperature sensor compatible with BMW 128i 320i 323Ci IS 325XI 328 330 525 528 530 540 545 550 645 650 740IL 745LI 750 760 Alpina M3 M5 M6 X3 X5 X6 Z4 Z8 Selected 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013.
Important Notice: For Fitment, please check the compatibility OEM Part number before purchase. It is fixed by 2 pins inside and the 2 outside little bumps to seize instead of the 2 large outside wings.
International products have separate terms, are sold from abroad and may differ from local products, including fit, age ratings, and language of product, labeling or instructions.

Fits for: 2008-2010 BMW 128i 2008-2010 BMW 128i N51B30A 2001-2005 BMW 320i 2000 BMW 323Ci 1999 BMW 323i E46 2000 BMW 323i 2006-2007 BMW 323i 2001-2006 BMW 325Ci 2001-2006 BMW 325i 2001-2006 BMW 325xi 2000 BMW 328Ci 1999 BMW 328i E46 2000 BMW 328i 2007-2010 BMW 328i N51B30A 2009-2010 BMW 328i xDrive N51B30A 2007-2008 BMW 328xi N51B30A 2001-2006 BMW 330Ci 2001-2006 BMW 330i 2001-2006 BMW 330xi 2001-2007 BMW 525i 2006-2007 BMW 525xi 1998-2000 BMW 528i 2001-2007 BMW 530i 2006-2007 BMW 530xi 1998-2003 BMW 540i 2004-2005 BMW 545i 2006-2008 BMW 550i 2010 BMW 550i 2010 BMW 550i GT 2004-2005 BMW 645Ci 2006-2010 BMW 650i 1998-2001 BMW 740i 1998-2001 BMW 740iL 2002-2005 BMW 745Li 2002-2005 BMW 745i 2006-2010 BMW 750Li 2010 BMW 750Li xDrive 2006-2010 BMW 750i 2010 BMW 750i xDrive 1998-2001 BMW 750iL 2003-2008 BMW 760Li 2010 BMW 760Li 2004-2006 BMW 760i 2001-2006 BMW M3 2000-2003 BMW M5 2006-2010 BMW M5 2006-2010 BMW M6 2004-2006 BMW X3 2000-2006 BMW X5 2007-2008 BMW X5 4.8i 2009-2010 BMW X5 xDrive48i 2010 BMW X5 M 2008-2010 BMW X6 xDrive50i 2010 BMW X6 M 2010 BMW X6 ActiveHybrid 2003-2007 BMW Z4 2000-2003 BMW Z8

Manufacturer	Dade
Brand	Dade
Product Dimensions	7.87 x 3.05 x 4.06 cm; 31.75 g
Item model number	13621433077
Manufacturer part number	13 62 1 433 077 13621433077
OEM Part Number	BMW 1362143307713621433077
Special Features	Fit BMW 128i 320i 323Ci IS 325XI 328 330 525 528 530 540 545 550 645 650 740IL 745LI 750 760 M3 M5 M6 X3 X5 X6 Z4 Z8 Selected 1998-2013
Item Weight	31.8 g

OEM 13621433077 Coolant Temperature Sensor in Lower Radiator Hose

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