OEM Radiator Expansion Tank Cap 140kPa For BMW 17117639020

Product Name: Radiator Cap (Coolant Expansion Tank Cap)Part Number: 17117639020, 17-11-7-639-020Interchange Part Numbers: 17117521071, 17-11-7-521-071Country of Origin: Made in GermanyPart Attribute: OEM PartCompatible BMW Engine Models:Inline-3: B38 (1.2T / 1.5T)Inline-4 (L4): N20 (1.6T / 2.0T), B47 2.0T (Diesel), B48 (2.0T), N46 (1.8L / 2.0L), N26 (2.0T), N43, N45 (1.6L / 2.0L), N13 (1.6T)Inline-6 (L6): N52 (2.5L / 3.0L), N53 (2.5L / 3.0L), N54 (3.0T), N55 (3.0T), B58 (3.0T), S58 (3.0T), N57 3.0T (Diesel)V8: N63 (4.4T)Features: Upgraded Genuine OEM Part. Officially upgraded based on the previous generation, extending the service life by 30% compared to the older version.Symptoms of a Failing or Damaged Radiator Cap:White Powder or Coolant Residue Around the Cap: Blue, green, or pink fluid stains or crusty white powder residue (evaporated coolant crystals) appear around the edges, threads of the expansion tank cap, or on the reservoir surface.Collapsed Coolant Hoses (When Cold): After the vehicle sits overnight and completely cools down, opening the hood reveals that the main radiator hose is severely flat, collapsed, or sucked inward. The hose returns to its normal shape once the engine starts or the cap is unscrewed.Burst Expansion Tank or Leaking Coolant Pipes: A classic BMW failure where the plastic expansion tank suddenly cracks open along a seam, or the fragile plastic T-joints and return hoses burst.Frequent Engine Overheating or Boiling Coolant: The dashboard triggers an engine overheating warning, and you can hear a gurgling or boiling sound coming from inside the coolant system.Frequent "Low Coolant" Dashboard Warning: The dashboard constantly prompts you to top off the coolant every few weeks or every thousand miles, even though there are no visible puddles or active leaks on the ground.Note: BMW coolant expansion tank caps are high-frequency wear items. If you notice white crusty buildup or collapsed hoses, replace it immediately with a cap that matches the correct factory pressure rating (check the 140 or 200 pressure rating printed on the back of the cap). Furthermore, whenever you replace a cracked or leaking coolant expansion tank, it is highly recommended to replace the cap simultaneously to prevent a malfunctioning old cap from over-pressurizing and bursting your brand-new tank.Compatiable With BMW1 series 04-07 15-19 118i / 04-19 120i / 12-19 125i / 07-11 130i / 12-15 135i / 12-15 M135i xDrive / 15-19 M140i2 series 15-21 218i / 14-21 220i / 15-21 M240i / 16-18 M23 series 05-07 2018 318i / 05-13 320i / 12-19 320i / 16-25 320i / 05-06 320si / 05-07 323i / 05-11 325i / 04-13 330i / 16-25 330i 3 series 16-25 330i xDrive / 13-16 335i / 15-16 335i xDrive / 17-18 340i xDrive / 12-15 ActiveHybrid4 series 14-17 420i / 13-17 428i / 13-16 428i xDrive / 16-20 430i / 16-21 430i xDrive / 13-20 435d xDrive 4 series 13-16 435i / 13-16 435i xDrive / 16-20 440i / 16-21 440i xDrive 5 series 10-17 520i / 17-23 525i / 11-17 528i / 11-17 528i xDrive / 10-13 17-22 530i / 10-17 535i / 09-17 535i xDrive5 series 11-16 ActiveHybrid / 17-20 530e Plug-in-Hybrid / 17-22 540i6 series 17-22 630i / 11-18 640i / 13-20 640i xDrive7 series 16-22 730i, Li / 12-15 740i / 12-15 740Li xDrive / 12-15 ActiveHybrid 7 / 16-19 740e / 16-19 740Le / 16-19 740Le xDrive 7 series 19-22 740i, Li / 15-19 740Li / 17-22 740Li xDrive / 19-22 750i / 19-22 750Li xDrive8 series 19-26 840i / 19-26 840i xDrive i8 14-20 hybridX1 10-15 sDrive 18i / 11-15 20i xDrive / 11-15 xDrive 28i / 09-11 28i xDrive / 10-11 25i xDriveX3 12-17 20i xDrive / 14-17 sDrive 20i / 12-17 28i xDrive / 10-17 35i xDrive / 19-25 M Competition M xDrive, M xDriveX4 14-18 20i xDrive / 14-18 xDrive 28i / 16-18 M40i xDrive / 14-18 35i xDrive / 18-25 xDrive 25i,xDrive 30 i / 19-25 M Competition M xDrive / 19-25 M xDriveX5 15-18 25d sDrive，28i xDrive，40e xDrive / 14-18 30d xDrive，35i xDrive / 18-23 40i xDrive / 20-23 45e Plug-in-Hybrid xDriveX6 14-19 M50d xDrive，30d xDrive / 14-16 35i xDrive / 19-23 xDrive 40i / 23-26 40i Mild-Hybrid xDriveX7 22-26 40i Mild-Hybrid xDrive / 19-26 40i xDriveXM 23-26 50eZ4 11-16 sDrive 20i,sDrive 28i / 09-11 sDrive 23i，sDrive 30i / 09-16 sDrive 35i

• OEM Upgrade: This Coolant Overflow Tank Cap is officially upgraded based on the previous generation. It features a precision pressure-regulating sealing design that controls high-temperature pressure more stably than the older version. Engineered for superior resistance to extreme heat and corrosion, it maintains optimal operational performance even in the harshest environments, delivering a significantly longer service life
• Specifications: The Radiator Cap is an OEM accessories for BMW. 140 kPa, 1-Pack. Part Number: 17-11-7-639-020, Interchange Part Numbers: 17117521071, 17-11-7-521-071, For BMW Engine Models: N20, N52, N54, B58, N57, N55, B47, S58, B48, N46, B38, N63, N26, N53, N43, N45, N13
• {Vehicle Fitment} Genuine Coolant Reservoir Cap For BMW 1 series 2004-2007 118i, 2004-2019 120i, 2012-2019 125i, 2007-2011 130i, 2012-2013 135i / M135i xDrive, 2015-2019 M140i; 2 series 2015-2021 218i, 2014-2021 220i / M240i, 2016-2018 M2; 3 series 2005-2007 318i, 2018 318i, 2005-2026 320i, 2005-2006 320si, 2005-2007 323i, 2005-2011 325i, 2004-2013 330i, 2016-2026 330i / 330i xDrive, 2013-2016 335i / 335i xDrive, 2017-2018 340i xDrive, 2012-2015 ActiveHybrid 5
• {Vehicle Fitment-2} Engine Reservoir cap For BMW 4 series 2014-2017 420i, 2013-2017 428i / 428i xDrive, 2016-2021 430i / 430i xDrive, 2013-2020 435d xDrive, 2013-2016 435i xDrive, 2016-2021 440i xDrive; 5 series 2010-2017 520i, 2017-2023 525i, 2011-2017 528i, 2010-2013 530i, 2017-2022 530i, 2010-2017 535i, 2009-2017 535i xDrive, 2017-2020 530e, 2017-2022 540i; 6 series 2017-2022 630i, 2011-2018 640i, 2013-2020 640i xDrive
• {Vehicle Fitment-3} Antifreeze Tank Cap For BMW 7 series 2016-22 20 730i / 730Li, 2012-2015 740i / 740Li xDrive / ActiveHybrid 7, 2016-2019 740e / 740Le / 740Le xDrive, 19-22 740i / 740Li, 17-22 740Li xDrive, 2019-2022 750i / 750Li xDrive; 8 series 2019-2026 840i / 840i xDrive; i8 14-20 hybrid; 2010-2015 X1 sDrive 18i / 20i xDrive / 28i / 28i xDrive / xDrive; 2012-2017 X3 20i / 28i / 35i; 2014-2025 X4 20i / 28i / 35i / M40i / 30i; 2015-2023 X5 25d / 28i / 40e / 30d / 35i / 40i / 45e; 2014-2025 X6; 2022-2026 X7; 2023-2026 XM; 2011-2016 Z4
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