- Oct 3, 2004Hi Guys.
I've managed 2 get an auxillary fan 4 my 520i cos i'm sick of
replacing viscous couplings all the time. I've got all the original
components from an e23 7 series but just need a relay number as there
wasn't 1 on the car in the scrappy. I'm just running it off the one
electric fan switch which i have screwed in the top of the thermostat
Any help with the bosch or bmw relay number would b greatly