E39 BMW 540i Custom Auxiliary Fan DIY (Cooling Overhaul Part 5 of 5)

The E39 5-series is an amazing car, but some thing BMW went a little overboard with the technology. The cooling system is way too complicated with the electric thermostat and the 2 bar pressure cap. Switching to a lower temp thermostat, electric fan, and a new radiator has really help my confidence in the car. The next step is to add an aux fan.

The factory fan has been broken since I bought the car, and they are way over priced. The aux fan is programmed to be on whenever the AC is on (my AC is always on). So, I decided to wire up a small 12 inch fan to run whenever the engine is running. it is the same as the factory fan would be as I always have the AC turned on. I wish it would turn off over 40 mph, but i will install a switch to disable it for long highway trips. So far, it is working great and preventing the main fan from coming on as often.

Fuse: https://www.amazon.com/Attwood-Line-Holder-ATO-ATC-Gauge/dp/B003EEV1YS

Relay: https://www.amazon.com/Support-Iron-Back-Relay-Socket/dp/B00TO9GVRY/ref=sr_1_8?s=automotive&ie=UTF8&qid=1539020425&sr=1-8&keywords=4+pin+40+amp+relay

Fan: https://www.amazon.com/UPGR8-Universal-Performance-Electric-Radiator/dp/B00T3TQLKW/ref=sr_1_1?s=automotive&ie=UTF8&qid=1539020507&sr=1-1&keywords=12+inch+fan

T-Connectors: https://www.amazon.com/Dorman-Help-85473-T-Taps-16-14/dp/B000CO7H7I/ref=sr_1_1?s=automotive&ie=UTF8&qid=1539020547&sr=1-1&keywords=t+connector

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