Super Duty Cooling Kit with Electric Fan

The E39 M5 Super Duty Cooling Kit by Zionsville Autosport is a comprehensive upgrade designed to replace common failure items in the cooling systems of 1999 to 2003 E38 and E39 series BMWs. It tackles the radiator, expansion tank, and the often-problematic engine-driven fan. The core of this kit's efficiency lies in its alloy fan shroud and electric fan combination. This system is engineered to pull 2070 cfm through the entire radiator core, ensuring maximum cooling even when the vehicle is at a standstill. Unlike methods that involve simply attaching a fan to the core, which can limit effectiveness and potentially fatigue cooling tubes over time, Zionsville's design creates a low-pressure area behind the radiator to draw air through the entire surface. This approach refines the original BMW design by improving shroud sealing and airflow without the parasitic drag of an engine-driven fan. The kit's electric fan is caged with a safety shroud and lighter blades, enhancing both safety and efficiency. Recognizing the common issue of plastic expansion tank failures due to high heat soak temperatures in V8 and V12 engines, Zionsville has developed an alloy expansion tank. This tank offers greater resistance to degradation and retains some original BMW features, including the cap, which manages coolant expansion and contraction while providing a safety release. The alloy radiator construction further boosts efficiency through increased radiant surfaces and enlarged storage capacity. Buyers can choose between a single-speed fan kit, which retains the factory auxiliary fan, or a two-speed fan kit that allows the SPAL fan to operate at variable speeds based on engine temperature, reducing unnecessary noise. This cooling kit is made in the USA using Euro Aluminum Cores. It is backed by a lifetime warranty for the original purchaser, provided proof of BMW coolant use at initial installation and every two years thereafter is maintained. The kit includes an alloy radiator, alloy fan shroud, alloy overflow tank, a 16-inch SPAL electric fan, coolant level sensor, rubber mounts, petcock valve, seal ring, temperature switch, sensor connector, sensor wire, and fan relay kit(s) (with an additional relay and resistor included for the two-speed option).