E46 M3 Aux Fan Not Working

How the system functions non modulated fans most models through late 90s.

E46 m3 aux fan not working.

Ever since my accident 4 years ago i ve been running without an aux fan haven t experienced any issues what so ever regarding overheating etc. If this still fails to turn on the fan i suggest you turn off the engine for now and consider troubleshooting other aspects of the cooling fan electrical system including the low speed fan relay. Just one single engine fan responsible for all the cooling down of that engine bay. I run the pusher fan where the stock aux would be located.

If 12v is present then you ve got a bad speed control box on the fan assembly and will need to replace the aux fan. I have the spal 16 pusher with an e46 m3 rad. No aux fan on the m54. 31 03 2015 12 02 am oppositelockmt wrote.

Our initial testing should provide a determination of where the fault lies. 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. I don t have a mechanical fan due to space restrictions of the swap in the e30 engine bay. The third picture shows what it looked like with the e30 condensor aux fan still installed.

I d suggest you sort out your aux fan if you can not sure how the setup is on the m54. 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. If the fan is not operating check the power connector at the base of the fan and make sure it s seated.