Help needed with 99 e46 cooling fan runs continuously after key removed

FFF wrote:
> After a long trip, 4 hours all highway but got stuck in construction
> detours several times, I get out of the car (e46) and the radiator fan
> ran on continuously.
>
> Pulled each fuse in fuse panel individually but made no difference.
>
> Pulled each of 3 relays in black box under hood in front of driver, no
> difference. Also noticed 5 or six fuses in covered black box 1 inch
> square but did not remove them to test circuit for open.
>
> Disconnected battery, fan stopped.
>
> Drove the car back home with power plug to fan disconnected. Temp gauge
> showed no tendency to overheat.
>
> What am I overlooking and where is it?
>
> Overheat switch that sends power to fan?
>
> Fan relay? Where is it?
>
> Thanks in advance to all who send help. I have to drive to work
> tomorrow. (highway)

I thought the radiator fan was mounted on a viscous clutch: cold engine,
grip (no turn), warm engine, slip (and turn).

Wouldn't this be your auxiliary fan?