BDFHYK Coolant Reservoir Expansion Tank with Cap for BMW 335i xDrive 2009-2013 335i 135i 2011-2013 M135i 2013-2016 X1 2012-2015, 3.0L I6, Pressurized Tank, Replaces 603-755 17137640515 17137590626

BDFHYK Coolant Reservoir Expansion Tank with Cap for BMW 335i xDrive 2009-2013 335i 135i 2011-2013 M135i 2013-2016 X1 2012-2015, 3.0L I6, Pressurized Tank, Replaces 603-755 17137640515 17137590626

• FITMENT FOR BMW 135i, 335i:For BMW 135i 2011-2013 3.0L I6 Turbo Gas. For BMW 335i 2011-2013 3.0L I6 Turbo Gas. For BMW 335i xDrive 2009-2013 3.0L I6 Turbo Gas. Verify the complete model designation because 335i and 335i xDrive have separate fitment records.
• FITMENT FOR BMW M135i, X1:For BMW M135i 2013-2016 3.0L I6 Turbo Gas. For BMW X1 2012-2013 3.0L I6 Gas Naturally Aspirated; X1 2013-2015 3.0L I6 Turbo Gas. The 2013 X1 appears under both engine configurations, so verify the exact engine and original reservoir before ordering.
• PRESSURIZED 1.3 L CONFIGURATION:The included cap has a listed maximum pressure rating of 140 ±15 kPa. The 1.3 L capacity is measured at the MAX fill level rather than the brim, leaving the intended space for coolant expansion. PA66+GF30 construction is rated from -30°C to 120°C and helps maintain alignment around the cap neck, hose connections, sensor area and mounting points through normal heat cycles and vibration. Configured for an external coolant-level sensor; verify the original sensor and connector before ordering.
• REPLACEMENT REFERENCES:Cross-references 603-755, V202980, V203453, EPT0131, EPK0131, 17137640515, 17137590626, 7590626 and 7640515. Compare the replacement number, reservoir shape, mounting points, hose connections and external sensor arrangement because similar-looking tanks may use different configurations.
• BUILT AROUND REAL REPLACEMENT NEEDS:Cracks, seam or hose-neck seepage, dried coolant residue, repeated coolant top-offs or a low-coolant warning may indicate deterioration of the original reservoir or its connections. BDFHYK treats the reservoir as part of a pressurized cooling system: cap rating, cap-neck sealing, hose connections, clamps, sensor seating and correct filling and bleeding all affect operation. Continued coolant loss or elevated engine temperature requires complete cooling-system diagnosis.