While troubleshooting the e46 aux fan is outside the scope of this document i ll point out that the e46 design replaced the individual relays with a speed controller integrated with the fan.
E46 m3 aux fan relay.
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For the bmw 3 e46 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 model year.
If the fan runs erratically continuously with the key removed from the ignition or not at all and the fuse is good the speed controller has.
The n15 design e46 m3 electric fan mount is a great way to add a 16 spal electric fan because it s so easy to install.
Fuse box diagram location and assignment of electrical fuses and relays for bmw 3 series e46 316i 318i 318d 320i 320d 323i 325i 328i 330i 330d.
In addition the aux fan controller mount optional allows you to retain the stock controller to run the fan on auto as an oem style would.