E39 Super Duty Cooling Kit II

The Zionsville Autosport E39 Super Duty Cooling Kit II is engineered as a complete cooling system upgrade for the 1999-2003 6-cylinder E39 series BMWs, targeting common failure points like the radiator, expansion tank, and the factory engine-driven fan. This kit features an alloy fan shroud paired with a 14-inch Spal electric fan, designed to pull 2070 cfm through the entire radiator core. This design ensures maximum cooling efficiency, even at idle, by creating a low-pressure area that draws air across the whole core, preventing the parasitic drag of an engine-driven fan and avoiding potential tube fatigue. The construction utilizes high-efficiency fin design and better heat-dissipating materials, with an all-alloy, hand-welded build that eschews epoxy for enhanced repairability and a greatly increased lifespan. It is impact-resistant and tested at 4x operating pressure, boasting an aluminum core and offering improved serviceability with a petcock valve. The design retains BMW's clever cap functionality for coolant expansion and contraction while ensuring system integrity. Options for wiring include a single-speed fan kit or a two-speed kit, which uses a resistor to modulate fan speed based on engine temperature, reducing noise when high-speed operation isn't necessary. The kit is compatible with specific BMW E39 models, including the 2001-2003 525i, 2001-2003 525it, 1999-2000 528i, 1999-2000 528it, and 2001-2003 530i. Zionsville Autosport offers a lifetime warranty on their radiators to the original purchaser, contingent upon the use of BMW coolant at installation and every two years thereafter. All components are made in the USA with Euro Aluminum Cores.