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While your BMW cooling system may be considered very reliable, it's all depending on this coolant reservoir cap. This cap is not just to seal the coolant expansion tank - it regulates and maintains the pressure in the cooling system (2.0 bar). A failed cap can lower the pressure inside the system and lead to an overheating situation. Replacement of the cap is recommended every three years to ensure optimum cooling efficiency and performance. It's a simple and inexpensive preventative maintenance step.
BMW has had many different part numbers for this radiator cap over the years. This part number replaces BMW numbers 17117639022, 17111742231, 17111712669, 17111712492, and 17110152374.
This is an OEM expansion tank cap manufactured by Behr - an original supplier to BMW for many cooling system components. As an OEM it meets all of BMW's original design, fitment, and performance requirements and is TUV approved. OEM parts are the best alternative to more expensive Original BMW parts because they are virtually identical without the inflated price tag. This part has a two year warranty.
BMW Fitments:
3 Series E30 (84-91) > 318i E30 (84-91) > 318is 3 Series E36 (92-99) > 318i M42 E36 (92-99) > 318i M44 E36 (92-99) > 318ic M42 E36 (92-99) > 318ic M44 E36 (92-99) > 318is M42 E36 (92-99) > 318is M44 3 Series E36/5 (95-99) > 318ti M42 E36/5 (95-99) > 318ti M44 3 Series E46 (99-05) > 320i E46 (99-05) > 323Ci E46 (99-05) > 323i E46 (99-05) > 325Ci E46 (99-05) > 325i E46 (99-05) > 325xi E46 (99-05) > 328Ci E46 (99-05) > 328i E46 (99-05) > 330Ci E46 (99-05) > 330i E46 (99-05) > 330xi E46 (99-05) > M3 5 Series E34 (89-95) > 525i M50 E34 (89-95) > 530i E34 (89-95) > 535i E34 (89-95) > 540i E34 (89-95) > M5 (91-95) 5 Series E39 (97-03) > 525i E39 (97-03) > 528i 97-98 E39 (97-03) > 528i 99-00 E39 (97-03) > 530i E39 (97-03) > 540i E39 (97-03) > M5 (00-03) 5 Series F10 / F11 (11-16) > 550i F10 / F11 (11-16) > 550i xDrive F10 / F11 (11-16) > M5 (2013-2016) 6 Series F12 / F13 (12-18) > 650i F12 / F13 (12-18) > 650i xDrive F12 / F13 (12-18) > M6 7 Series E32 (88-94) > 735i E32 (88-94) > 735iL E32 (88-94) > 740i E32 (88-94) > 740iL E32 (88-94) > 750iL 7 Series E38 (95-01) > 740i E38 (95-01) > 740iL E38 (95-01) > 750iL 7 Series E65 / E66 (02-08) > 745Li E65 / E66 (02-08) > 745i E65 / E66 (02-08) > 750Li E65 / E66 (02-08) > 750i E65 / E66 (02-08) > 760Li 7 Series F01 / F02 (2009-2015) > 750Li F01 / F02 (2009-2015) > 750Li xDrive F01 / F02 (2009-2015) > 750i 8 Series E31 (91-97) > 840Ci E31 (91-97) > 850CSi E31 (91-97) > 850Ci X3 Series E83 X3 (04-10) > X3 2.5i M54 (2003-2005) E83 X3 (04-10) > X3 3.0i M54 (2003-2006) E83 X3 (04-10) > X3 3.0si N52 (2007-2010) X5 Series E53 X5 (00-06) > X5 3.0i M54 E53 X5 (00-06) > X5 4.4i M62 4.4L (99-03) E53 X5 (00-06) > X5 4.4i N62 E53 X5 (00-06) > X5 4.6is M62 E53 X5 (00-06) > X5 4.8is N62 Z Series E36/7 / E36/8 Z3 (96-02) > Z3 1.9 E36/7 / E36/8 Z3 (96-02) > Z3 2.3 E36/7 / E36/8 Z3 (96-02) > Z3 2.5 E36/7 / E36/8 Z3 (96-02) > Z3 2.8 97-98 E36/7 / E36/8 Z3 (96-02) > Z3 2.8 99-00 E36/7 / E36/8 Z3 (96-02) > Z3 3.0 E36/7 / E36/8 Z3 (96-02) > Z3 M - S52 E36/7 / E36/8 Z3 (96-02) > Z3 M - S54 Z Series E52 Z8 (00-03) > Z8 Roadster (2000-2003) Z Series E85 / E86 Z4 (03-08) > Z4 2.5i M54 E85 / E86 Z4 (03-08) > Z4 3.0i M54 E85 / E86 Z4 (03-08) > Z4 3.0i N52 E85 / E86 Z4 (03-08) > Z4 3.0si N52 E85 / E86 Z4 (03-08) > Z4 M
$11.24
Coolant Expansion Tank Cap, OEM - E36, E46, E39, E38, X3, X5, Z3, Z4
Keep optimum cooling performance - replace your cap every three years! OEM replacement for BMW part #17117639022.
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