High quality Radiator Cap 17117639022 for BMW 5 Series

This radiator cap, part number 17117639022, is a precision-engineered cooling system component specifically designed for the BMW 5 Series F07 GT LCI, including the 550i model. As a critical pressure control element within the cooling system, this cap seals the radiator or coolant expansion tank while maintaining the specified system pressure to raise the coolant boiling point, preventing overheating and ensuring efficient heat transfer. The integrated pressure relief valve releases excess pressure when the system exceeds the designated threshold, protecting hoses, seals, and the radiator from damage, while the vacuum relief valve allows coolant to return from the expansion tank during engine cool-down.

Manufactured from high-grade engineering plastics and corrosion-resistant metals with precision-calibrated valve mechanisms, this radiator cap offers exceptional durability, reliable pressure regulation, and long service life under sustained temperature fluctuations and pressure cycling. The precision-molded sealing surfaces ensure leak-free operation and proper pressure retention. Each unit undergoes stringent quality testing, including pressure calibration verification, sealing integrity assessment, and thermal cycling simulation, to guarantee performance and reliability that meet or exceed original equipment standards. The direct-fit design with factory-matching dimensions allows for straightforward replacement without modifications.

A failing or worn radiator cap can result in coolant loss, engine overheating, or collapsed hoses due to improper pressure regulation. Replacing a defective unit with this premium 17117639022 radiator cap restores proper cooling system pressurization and reliable operation. This component is ideal for cooling system maintenance, overheating troubleshooting, or preventative replacement on the F07 GT LCI 550i. Please confirm compatibility with your specific BMW F07 model, including production year and engine variant, before ordering to ensure accurate fitment and optimal cooling system performance.